BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//iannounce.physik.uni-mainz.de//iannounce//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Theorie-Palaver
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: George Lavrelashvili on Non-Abelian Gravitating S
olitons and Black Holes
DTSTART;VALUE=DATE-TIME:20030506T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:187@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/187
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Pavel Baikow on Recent Progress in Four-Loop
Integral Calculations
DTSTART;VALUE=DATE-TIME:20030520T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:237@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/237
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ch. Fischer on Infrared Properties of Landau Gaug
e QCD
DTSTART;VALUE=DATE-TIME:20030527T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:238@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/238
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ch. Schwinn on Eichinvarianz in nummerischen Rech
nungen: Werkzeug und Herausforderung
DTSTART;VALUE=DATE-TIME:20030701T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:254@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/254
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Joan Solà on A semiclassical FLRW model wi
th running cosmological constant
DTSTART;VALUE=DATE-TIME:20030722T141500
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:265@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/265
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jörg Jäckel on Spontaneous Symmetry Breaking by
Condensation of Composites of Fermions
DTSTART;VALUE=DATE-TIME:20031211T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:347@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/347
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jan Schwindt on Holographic Branes
DTSTART;VALUE=DATE-TIME:20031215T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:348@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/348
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Jan Kalinowski on Supersymmetry at and beyo
nd the LHC
DTSTART;VALUE=DATE-TIME:20070504T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1124@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1124
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Monika Blanke on Flavour changing Neutral Current
s in the Littlest Higgs Model with T-Parity
DTSTART;VALUE=DATE-TIME:20070508T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1125@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Hilbert-Raum 05-231
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1125
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Anna Hasenfratz on Dynamical lattice simula
tions with smeared Wilson fermions
DTSTART;VALUE=DATE-TIME:20070515T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1126@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1126
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: PD Dr. Holger Gies on Functional Methods in QCD:
Results and Challenges
DTSTART;VALUE=DATE-TIME:20070522T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1127@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1127
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Andres Reyes on Berry Phasen\, Chern Zahlen
und Quantenphasenübergänge
DTSTART;VALUE=DATE-TIME:20070605T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1128@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1128
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Martin Beneke on Calculation of four-fe
rmion production in the W pair production threshold region with unstable p
article effective theory
DTSTART;VALUE=DATE-TIME:20070612T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1129@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1129
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Alexander Mitov on QCD at Higher Loops and Le
gs
DTSTART;VALUE=DATE-TIME:20070619T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1130@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1130
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Gudrun Hiller on Penguin Physics at the
LHC
DTSTART;VALUE=DATE-TIME:20070703T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1131@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1131
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Hans-Werner Hammer on Cold Atoms\, Limi
t Cycles and the Effimov Effet
DTSTART;VALUE=DATE-TIME:20070626T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1132@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1132
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Thomas Mannel on Some Recent Results on
Inclusive Semi-leptonic Decays
DTSTART;VALUE=DATE-TIME:20070710T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1133@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1133
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Richard Hill on Topological Physics of Little
Higgs Bosons
DTSTART;VALUE=DATE-TIME:20070717T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1171@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1171
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Francesco Knechtli on Spontaneous symme
try breaking from an extra dimension
DTSTART;VALUE=DATE-TIME:20080212T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1257@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1257
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: PD Dr. Jörg Frauendiener on Konforme Strukturen
in der ART
DTSTART;VALUE=DATE-TIME:20071127T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1258@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1258
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: PD Dr. Ulrich Haisch on How to kill a penguin
DTSTART;VALUE=DATE-TIME:20071217T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1259@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Within constrained minimal-flavor-violation the large destruct
ive flavor-changing Z-penguin managed to survive eradication so far. We gi
ve a incisive description of how to kill it using the precision measuremen
ts of the Z -> b anti-b pseudo observables. The derived stringent range fo
r the non-standard contribution to the universal Inami-Lim function C lead
s to tight two-sided limits for the branching ratios of all Z-penguin domi
nated flavor-changing K- and B-decays.
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1259
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Ben Pecjak on B → V gamma decays at NNLO in
SCET
DTSTART;VALUE=DATE-TIME:20071211T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1260@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1260
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Alexei Pivovarov on B^{0} - B^{0} mixing beyond factorization: QCD sum rules analysis
DTSTART;VALUE=DATE-TIME:20071023T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1278@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Corrections to factorization approximations for the matrix ele
ments of B^{0} - B^{0} meson mixing are computed within
QCD sum rules approach. Both nonperturbative and perturbative corrections
are analyzed. Nonperturbative corrections are well under control and small
while perturbative corrections are found to be of order 10%.
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1278
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Li-Lin Yang on Top-quark flavor-changing neut
ral interactions
DTSTART;VALUE=DATE-TIME:20071030T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1287@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1287
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Ruth Britto on Constructing QCD amplitudes wi
th spinors and unitarity
DTSTART;VALUE=DATE-TIME:20071206T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1288@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1288
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Thomas Gehrmann on Precision QCD with j
et observables
DTSTART;VALUE=DATE-TIME:20080115T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1289@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Jet production observables are among the most sensitive probes
of QCD at high energy colliders\, where they are used for example to dete
rmine the strong coupling constant. Until recently\, the interpretation of
jet production data within perturbative QCD is restricted to next-to-lead
ing (NLO) calculations\, with theoretical uncertainties being considerably
larger than current experimental errors. We report on the first NNLO cal
culation of event shapes and jet observables in electron-positron annihil
ation\, and discuss the impact of these new results on the interpretation
of percision QCD data from LEP.
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1289
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Zoltan Nagy on Parton shower with quantum int
erference
DTSTART;VALUE=DATE-TIME:20080122T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1290@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1290
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: PD Dr. André Hoang on Factorization Approach to
Top Mass Reconstruction
DTSTART;VALUE=DATE-TIME:20080129T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1291@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1291
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Mikhail Rogal on CC DIS at alpha_s^3 in Melli
n-N and Bjorken-x spaces
DTSTART;VALUE=DATE-TIME:20071120T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1299@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1299
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Margarete Mühlleitner on SUSY QCD correction
s to squark loops in Higgs boson production via gluon gluon fusion
DTSTART;VALUE=DATE-TIME:20080117T160000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1315@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:At existing and future hadron colliders Higgs boson production
via gluon gluon fusion is one of the dominant Higgs production processes.
The (large) QCD corrections have been calculated at NLO and recently at N
NLO (in the heavy top quark limit). So far the NLO SUSY-QCD corrections ar
e only known in the heavy squark limit which is reliable for large squark
masses. We have calculated the SUSY-QCD correction including the full squa
rk mass dependence at NLO thus closing the existing hole. The new results
will be particularly important in MSSM scenarios with a large contribution
from squark loops\, i.e. for squark masses below about 400GeV.
LOCATION:Sozialraum der WA ThEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1315
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Gil Paz on Z'-mediated Supersymmetry Breaking
DTSTART;VALUE=DATE-TIME:20080331T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1352@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1352
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andrey Grozin on Heavy-quark chromomagnetic i
nteraction
DTSTART;VALUE=DATE-TIME:20080506T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1389@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1389
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Klaus Fredenhagen on Quantum field theo
ry on curved space time
DTSTART;VALUE=DATE-TIME:20080520T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1390@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1390
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Giuseppe Bozzi on Soft-gluon resummation for
the Higgs differential distribution at the LHC
DTSTART;VALUE=DATE-TIME:20080527T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1391@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:"Soft-gluon resummation for the Higgs differential distributio
n at the LHC"\n\nABSTRACT:\nWe consider Higgs boson production by gluon fu
sion in hadron collisions.\nWe study the doubly-differential transverse-mo
mentum (q_T) and rapidity (y) distribution of the Higgs boson in perturbat
ive QCD. In the region of small q_T (q_T << M_H)\, M_H being the mass of t
he Higgs boson)\, we include the effect of logarithmically-enhanced contri
butions due to multiparton radiation to all perturbative orders.\nWe use t
he impact parameter and double Mellin moments to implement and factorize t
he multiparton kinematics constraint of transverse- and longitudinal-momen
tum conservation. The logarithmic terms are then systematically resummed i
n exponential form.\nAt small q_T\, we perform the all-order resummation o
f large logarithms up to next-to-next-to-leading logarithmic accuracy\, wh
ile at large q_T (q_T ~M_H)\, we apply a matching procedure that recovers
the ﬁxed-order perturbation theory up to next-to-leading order.\nWe pres
ent quantitative results for the differential cross section in q_T and y a
t the LHC\, and we comment on the comparison with the q_T cross section in
tegrated over y.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1391
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Michael Ratz on Running Minimal Flavor
Violation
DTSTART;VALUE=DATE-TIME:20080513T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1396@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1396
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Frank Steffen on Supersymmetric Dark Matter C
andidates
DTSTART;VALUE=DATE-TIME:20080617T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1397@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1397
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Jan Pawlowski on Confinement\, chiral symmetr
y breaking and the QCD phase diagram
DTSTART;VALUE=DATE-TIME:20080603T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1399@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1399
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Adam Falkowski on Flavor in Randall-Sundrum m
odels
DTSTART;VALUE=DATE-TIME:20080624T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1402@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will talk about 5D warped theories and their potential to ex
plain the hierarchies of fermion masses and mixing in the Standard Model.
I will review the severe constraints on the mass scale of new physics fro
m flavor-changing neutral current processes\, and discuss how new flavor
symmetries may ameliorate the situation.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1402
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Mikhail Ivanov on Pion Polarizability
DTSTART;VALUE=DATE-TIME:20080429T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1411@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1411
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Cesareo Dominguez on QCD determination of t
he up-\, down-\, and strange-quark masses with minimal hadronic resonance
bias
DTSTART;VALUE=DATE-TIME:20000101T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1435@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1435
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Giulia Zanderighi on On the Numerical Evalu
ation of One-Loop Amplitudes: The Glunonic Case
DTSTART;VALUE=DATE-TIME:20080610T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1436@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We discuss how to compute one-loop amplitudes in QCD by combin
ing unitarity in higher dimension with tree level recursions.\nWe show tha
t all N-gluon one-loop helicity amplitudes can be computed numerically for
arbitrary N with an algorithm which has a mild\, polynomial growth in N.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1436
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Cesareo Dominguez on QCD determination of t
he up-\, down-\, and strange-quark masses with minimal hadronic resonance
bias
DTSTART;VALUE=DATE-TIME:20080701T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1437@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1437
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Oleg Lebedev on Higgs dependent Yukawa coup
lings
DTSTART;VALUE=DATE-TIME:20080708T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1448@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1448
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Guillermo Chacón-Acosta on Polymer quantum mecha
nics and thermodynamics of simple systems
DTSTART;VALUE=DATE-TIME:20080627T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1456@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1456
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. A. Chamseddine on Connections between n
oncommutative geometry\, spectral action and quantum gravity
DTSTART;VALUE=DATE-TIME:20080730T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1464@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1464
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Ben Pecjak on NNLO corrections to B --> X_u l
nu and the determination of V_ub
DTSTART;VALUE=DATE-TIME:20081104T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1496@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1496
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Stefan Groote on Evaluation of n-loop sunrise
-type diagrams using configuration space techniques
DTSTART;VALUE=DATE-TIME:20081118T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1497@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1497
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Lilin Yang on Renormalization-Group Improved
Prediction for Higgs Production at Hadron Colliders
DTSTART;VALUE=DATE-TIME:20081125T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1498@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1498
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Francis Brown on Feynman integrals and multip
le zeta values
DTSTART;VALUE=DATE-TIME:20081111T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1515@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1515
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Doreen Wackeroth on Associated producti
on of a weak gauge boson and one or two bottom quarks at hadron colliders
DTSTART;VALUE=DATE-TIME:20081128T123000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1541@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:One of the main goals of high-energy collider experiments is t
he elucidation of the mechanism of Electroweak Symmetry Breaking (EWSB) as
well as the exploration of energy scales beyond the weak scale\, where ph
ysics beyond the Standard Model (BSM) is expected. The hadronic productio
n of a weak gauge boson in association with one or two bottom quarks plays
a crucial role in some of the current studies of EWSB and BSM physics at
the Fermilab Tevatron p anti-p collider. These processes represent the maj
or irreducible backgrounds to the main search modes for a light SM-like Hi
ggs boson at the Tevatron\, i.e. WH and ZH with the Higgs decaying in a bo
ttom-quark pair. Moreover\, Wb anti-b production accounts for one of the m
ost important backgrounds to single-top production\, which tests the funda
mental structure of the Wtb vertex. I will present the calculation of Zb a
nti-b and W boson production in association with one or two bottom quarks
at next-leading-order QCD with full bottom quark mass dependence. Present
experimental analyses use NLO predictions provided by the MCFM package cal
culated in the zero-bottom quark mass approximation. I will discuss the re
sults of a comparison of MCFM and our calculation with special emphasis on
the bottom mass effects.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1541
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Sven Moch on Phenomenological applications of
resummation
DTSTART;VALUE=DATE-TIME:20081209T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1544@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1544
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Matteo Cacciari on Recent developments in jet
clustering and related techniques
DTSTART;VALUE=DATE-TIME:20081216T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1545@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1545
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Sebastian Jäger on Higgs-mediated FCNC
s in the MSSM simplified
DTSTART;VALUE=DATE-TIME:20081202T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1547@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I present a systematic study of the higgs sector of the MSSM w
ith minimal flavour violation at large tan(beta) and tan(beta)-enhanced hi
gher-order contributions to B-Bbar mixing. To this end I discuss the one-l
oop structure of the Higgs sector in the limit v << M_SUSY in full general
ity and identify an approximate U(1) symmetry in the low-energy effective
two-higgs-doublet model in the phase of broken electroweak symmetry. By ju
diciously choosing the U(1) charges\, one can identify four independent sm
all parameters and show that any contribution to B-Bbar mixing that does n
ot enter through the SM operator must be proportional to one of them. This
allows for an exhaustive discussion of possible large corrections to the
commonly used results in the literature. I discuss the phenomenological im
pact\, the renormalization condition for tan(beta)\, and compare to earlie
r studies in the literature.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1547
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Oliver Rosten on Triviality from the Exact Re
normalization Group
DTSTART;VALUE=DATE-TIME:20090217T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1571@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1571
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andrea Ferroglia on Multiloop Calculations fr
om the GeV Scale to the TeV Scale
DTSTART;VALUE=DATE-TIME:20090120T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1575@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1575
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Kristina Giesel on Loop Quantum Gravity
DTSTART;VALUE=DATE-TIME:20090127T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1576@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1576
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pedro Schwaller on T-Parity Breaking in the Littl
est Higgs Model
DTSTART;VALUE=DATE-TIME:20090113T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1577@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1577
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Tilman Plehn on Once we have all that L
HC data...
DTSTART;VALUE=DATE-TIME:20090203T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1584@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1584
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Dominik Stöckinger on Das magnetische
Moment des Myons --- Evidenz fuer Supersymmetrie?
DTSTART;VALUE=DATE-TIME:20090210T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1589@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1589
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Christian Bauer on Merging NLO Calculations w
ith Parton Showers
DTSTART;VALUE=DATE-TIME:20090421T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1632@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1632
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Susanne Westhoff on Probing Yukawa Unificatio
n with K and B Mixing
DTSTART;VALUE=DATE-TIME:20090630T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1643@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In supersymmetric Grand Unified Theories\, the unification of
down-quark and charged-lepton Yukawa couplings links the large atmospheric
neutrino mixing angle to b -> s transitions. As Yukawa unification fails
for light fermions\, one introduces corrections which affect s -> d and b
-> d transitions via the mixing of the corresponding right-handed superpar
tners. On the basis of a specific SUSY-SO(10) model\, we analyse the stron
g constraints from K-Kbar and B-Bbar mixing on the flavour structure of th
ese corrections. Furthermore I will discuss the impact of large neutrino m
ixings on the unitarity triangle and the large CP-violating phase recently
observed in B_s -> psi phi decays.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1643
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Michael G. Schmidt on CP violation in t
he bosonized Standard Model and Cold Baryogenesis
DTSTART;VALUE=DATE-TIME:20090428T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1648@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1648
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Nicolas Greiner on Automation of the Dipole Subtr
action Method in MadGraph
DTSTART;VALUE=DATE-TIME:20090519T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1657@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1657
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Christopher Smith on Minimal flavor violation
in supersymmetric theories
DTSTART;VALUE=DATE-TIME:20090505T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1658@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1658
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Chris White on Path Integral Methods for Soft
Gluon Resummation
DTSTART;VALUE=DATE-TIME:20090512T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1659@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:It has long been known that large corrections to cross-section
s result from the multiple emission of soft gauge bosons\, in either abeli
an or non-abelian theories. I review the exponentiation of these correctio
ns in the eikonal approximation\, before introducing a new technique for d
escribing soft gluon emission using path integral methods. The framework c
an be easily generalised to beyond the eikonal approximation\, and I will
use this to classify the structure of matrix element corrections at next-t
o-eikonal level.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1659
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Daniel Maître on QCD NLO Corrections with Bl
ackHat
DTSTART;VALUE=DATE-TIME:20090526T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1660@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1660
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Gero von Gersdorff on Conformal Neutrinos - A
n Alternative to the Seesaw Mechanism
DTSTART;VALUE=DATE-TIME:20090609T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1661@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1661
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Iain Stewart on Thrust at N^3LL with Po
wer Corrections\, and a Global Fit for alphas(mZ)
DTSTART;VALUE=DATE-TIME:20090623T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1662@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1662
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Ingo Schienbein on Masses in perturbative QCD
DTSTART;VALUE=DATE-TIME:20090714T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1663@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1663
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Cedric Studerus on Two-Loop Corrections to Top-Qu
ark Pair Production
DTSTART;VALUE=DATE-TIME:20090721T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1664@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1664
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andrey Grozin on Three-loop HQET vertex diagr
ams for B0 - antiB0 mixing
DTSTART;VALUE=DATE-TIME:20090602T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1665@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1665
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. M.A. Ivanov on Relations between SU(2) and SU
(3) Low Energy Constants in XPT at the two-loop level
DTSTART;VALUE=DATE-TIME:20090528T120000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1679@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1679
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Mert Aybat on Bulk Fermions in Soft Wall Mode
ls
DTSTART;VALUE=DATE-TIME:20090707T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1706@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Models with warped extra dimensions and a soft infrared wall
provide an exciting realization of electroweak symmetry breaking\, with p
henomenological implications that go beyond the standard Randall-Sundrum m
odel with a hard wall. We incorporate bulk fermions in soft wall models an
d study electroweak and flavor constraints in fully realistic models\, inc
luding a heavy top quark. We also discuss LHC phenomenology for these mode
ls.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1706
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andreas Weiler on The Higgs boson: buried or
charming
DTSTART;VALUE=DATE-TIME:20091027T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1758@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1758
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Sven Heinemeyer on The Higgs Code(s)
DTSTART;VALUE=DATE-TIME:20091103T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1759@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1759
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Laura Covi on Gravitino Dark Matter
DTSTART;VALUE=DATE-TIME:20091110T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1760@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1760
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Sebastian Klein on Heavy Flavor Production in
DIS for Large Virtualities
DTSTART;VALUE=DATE-TIME:20091117T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1761@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1761
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Sandro Uccirati on NNLL Electroweak Correctio
ns to W Boson Pair Production at LHC
DTSTART;VALUE=DATE-TIME:20091124T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1762@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1762
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Bianca Dittrich on Diffeomorphism symmetry an
d perfect actions in discrete gravity
DTSTART;VALUE=DATE-TIME:20091201T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1763@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Many approaches to quantum gravity introduce a discretization
of the underlying manifold as an uv cutoff in order to obtain well defined
models. Typically such a discretization leads however to a breaking of di
ffeomorphism symmetry. This represents a severe problem for lattice approa
ches to quantum gravity as diffeomorphism symmetry is deeply intertwined w
ith the dynamics of general relativity.\nPerfect actions\, which can be co
nstructed by a renormalization block transformation from the continuum\, m
ight remedy the situation. These actions\, although defined on the lattice
\, capture the continuum physics of the model\, and hence should capture a
lso the symmetries of the continuum.\nIn this talk I will give an overview
of the situation and describe recent progress.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1763
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Alexander Mück on Electroweak Precision for
Drell-Yan
DTSTART;VALUE=DATE-TIME:20091208T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1764@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1764
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Alex Knochel on Warped SUSY and Dark Matter w
ithout a Higgs
DTSTART;VALUE=DATE-TIME:20100112T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1765@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1765
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Damiano Anselmi on Standard Model And High En
ergy Lorentz Violation
DTSTART;VALUE=DATE-TIME:20100119T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1766@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We show that if Lorentz symmetry is violated at high energies\
, interactions that are usually non-renormalizable can become renormalizab
le by weighted power counting. We present a CPT invariant\, Lorentz violat
ing extension of the Standard Model containing two scalar-two fermion inte
ractions (which can explain neutrino masses) and four fermion interactions
(which can explain proton decay). The presence of four fermion vertices a
llows us to argue that the known low energy physics can be reproduced also
if the elementary scalars are suppressed\, in the Nambu--Jona-Lasinio spi
rit\, avoiding the ambiguities of common non-renormalizable approaches. Us
ing a large-Nc expansion\, we study the dynamical symmetry breaking in the
scalarless model\, and show that the effective potential has a Lorentz in
variant minimum and that the Lorentz violation does not reverberate down t
o low energies. The mechanism generates fermion masses\, gauge-boson masse
s and scalar bound states\, to be identified with composite Higgs bosons.
Moreover\, it predicts relations among the parameters of the Standard Mode
l.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1766
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Mike Creutz on Anomalies and Discrete Chiral
Symmetries
DTSTART;VALUE=DATE-TIME:20100202T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1803@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1803
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Christoph Bergbauer on t.b.a.
DTSTART;VALUE=DATE-TIME:20091215T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1822@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1822
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Roman Zwicky on Lee-Wick or a higher derivati
ve standard model
DTSTART;VALUE=DATE-TIME:20100126T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1829@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1829
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Florian Jung on t.b.a.
DTSTART;VALUE=DATE-TIME:20090209T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1831@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1831
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Florian Jung on Canonical Group Quantization
DTSTART;VALUE=DATE-TIME:20100209T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1832@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Canonical Group Quantization is a quantization method that can
handle non-trivial phase spaces. After explaining the problems with conve
ntional quantization\, I will describe how the so-called Canonical Group a
rises from group actions on phase space. Afterwards I'm going to give an o
verview of the general quantization scheme\, including some examples.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1832
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Leonardo Vernazza on Supersymmetry effects in
non-leptonic B decays
DTSTART;VALUE=DATE-TIME:20100420T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1879@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP (Physikgebäude\, 05-427)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1879
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Bj?rn Garbrecht on Leptogenesis: CPT &
CTP
DTSTART;VALUE=DATE-TIME:20100608T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1888@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We derive kinetic equations for Leptogenesis in the early Univ
erse from first principles within the Closed Time Path (CTP) framework\, a
.k.a. the "in-in formalism". It is shown that the somewhat heuristic proce
dure of subtraction of real intermediate states\, that needs to be applied
in the conventional in-out approach in order to comply with the CTP theor
em\, is not necessary within the CPT approach. Besides this issue of rathe
r theoretical interest\, the resulting kinetic equations exhibit quantum s
tatistical corrections that are relevant in the parametric regime of weak
washout. Our methods may also serve as a starting point for further improv
ements in the quantitative predictions for Leptogenesis.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1888
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Tobias Hurth on New physics sensitivity of th
e rare decay mode b -> sl+l-
DTSTART;VALUE=DATE-TIME:20100427T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1889@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1889
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andrea Ferroglia on Introduction to Loop Calc
ulations\, Part I
DTSTART;VALUE=DATE-TIME:20100504T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1893@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The goal of these lectures is to review\, at an introductory l
evel\, some of the techniques employed for the calculation of integrals
originating from Feynman diagrams with closed loops of virtual particles
. I plan to discuss the basics of Feynman parameterization\, dimensional
regularization\, calculation of one-loop scalar integrals\, Passarino-V
eltman reduction\, reduction to master integrals by means of the integrati
on by parts identities\, the differential equation method\, and methods ba
sed on Mellin-Barnes representations.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1893
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andrea Ferroglia on Introduction to Loop Calc
ulations\, Part II
DTSTART;VALUE=DATE-TIME:20100511T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1894@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The goal of these lectures is to review\, at an introductory l
evel\, some of the techniques employed for the calculation of integrals
originating from Feynman diagrams with closed loops of virtual particles
. I plan to discuss the basics of Feynman parameterization\, dimensional
regularization\, calculation of one-loop scalar integrals\, Passarino-V
eltman reduction\, reduction to master integrals by means of the integrati
on by parts identities\, the differential equation method\, and methods ba
sed on Mellin-Barnes representations.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1894
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andrea Ferroglia on Introduction to Loop Calc
ulations\, Part III
DTSTART;VALUE=DATE-TIME:20100518T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1895@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The goal of these lectures is to review\, at an introductory l
evel\, some of the techniques employed for the calculation of integrals
originating from Feynman diagrams with closed loops of virtual particles.
I plan to discuss the basics of Feynman parameterization\, dimensional r
egularization\, calculation of one-loop scalar integrals\, Passarino-Velt
man reduction\, reduction to master integrals by means of the integration
by parts identities\, the differential equation method\, and methods base
d on Mellin-Barnes representations.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1895
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Daniele Oriti on The microscopic dynamics of quan
tum space as a group field theory
DTSTART;VALUE=DATE-TIME:20100601T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1896@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We give an introduction to the group field theory approach to
quantum gravity. This is a generalization of matrix models for 2d gravity
to higher dimensions\, and a framework that brings together elements from
other approaches like loop quantum gravity\, non-commutative geometry and
simplicial quantum gravity. We also report on some recent results obtained
in this context\, concerning both the mathematical definition and propert
ies of group field theory models and possible avenues for extracting physi
cal predictions from them.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1896
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dipl. Phys. Michael Benzke on Irreducible Uncerta
inties in B → X_s γ Decay
DTSTART;VALUE=DATE-TIME:20100525T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1897@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The decay rate of B → X_s γ is considered. \nSubleading con
tributions in the 1/m_b expansion obey a new factorization formula which i
ntroduces a new type of soft function\, that is not perturbatively calcula
ble. Their effect on the partially integrated rate is estimated.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1897
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Heute leider kein Theorie-Palaver! on n/a
DTSTART;VALUE=DATE-TIME:20100622T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1898@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1898
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Jörg Jäckel on Hidden Sectors and More @ Lo
w Energies
DTSTART;VALUE=DATE-TIME:20100629T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1899@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Particle physics is often associated with huge experiments lik
e the LHC which explore the high energy frontier. \nHowever\, small scale\
, low energy but high precision experiments can provide a wealth of comple
mentary information on the fundamental laws of nature.\nIndeed\, a variety
of low energy experiments have discovery potential for new light\, 'hidde
n' particles with extremely weak interactions. \nExamples for these partic
les are axions\, axion-like particles\, hidden sector photons and minichar
ged particles.\nIn this talk we will look both at the motivation for such
particles as well as possible ways to detect them.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1899
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: N.N. on entfällt
DTSTART;VALUE=DATE-TIME:20100706T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1900@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1900
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sacha Davidson on Minimal Flavour Violation and L
eptoquarks
DTSTART;VALUE=DATE-TIME:20100713T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1901@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:no abstract available
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1901
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dipl.-Phys. Lukas Janssen on RG Flow for 3d Fermi
onic Models
DTSTART;VALUE=DATE-TIME:20100506T091500
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1923@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1923
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dipl.-Phys. Andreas Rodigast on Running Couplings
in Perturbative Quantum Gravity
DTSTART;VALUE=DATE-TIME:20100617T091500
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1934@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Perturbatively quantized General Relativity is infamously non-
renormalizable and thus ill-suited as a fundamental theory. \nNevertheless
\, by treating it as an effective field theory it provides insight into qu
antum gravity phenomenology. In this framework we calculated the gravitati
onal corrections to the one-loop beta-functions of the Standard Model coup
lings. In contrast to the previous claim by Robinson and Wilczek\, we foun
d a cancellation of the gravitational contribution to its running for the
gauge coupling.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1934
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Emil Mottola on Effective Field Theory of Infrare
d Gravity:
DTSTART;VALUE=DATE-TIME:20101021T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1989@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:General Relativity receives quantum corrections relevant at m
acroscopic distance scales and near event horizons. These arise from the
conformal scalar degrees of freedom generated by the trace anomaly. I wi
ll review the role of anomalies and their importance for determining the
low energy effective action in gauge theories and two dimensional gravit
y. The effective action for the trace anomaly in four dimensions is const
ructed and shown to lead to additional scalar degrees of freedom in low
energy gravity not present in Einstein's general relativity. At event hor
izons the conformal anomaly scalar degrees of freedom can have macroscop
ically large effects on the geometry\, potentially removing the classical
event horizon of black hole and cosmological spacetimes\, replacing the
m with a quantum boundary layer where the effective value of the gravitat
ional vacuum energy density can change. In the effective theory\, the co
smological term becomes a dynamical condensate\, and a running coupling w
hose value depends upon boundary conditions near the horizon. \nThe obser
ved dark energy of our universe likewise may be a macroscopic finite size
effect whose value depends not on microphysics but on the cosmological
horizon scale. This infrared renormalization effect could be studied by t
he methods of the Exact Renormalization Group.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1989
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Achilleas Lazopoulos on Disentangling the overlap
ping singularities of NNLO amplitudes
DTSTART;VALUE=DATE-TIME:20101026T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1990@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The ambitious physical programs of modern hadron colliders dep
end on precise theoretical predictions for various signal and background p
rocesses. In some cases\, including Higgs production in gluon fusion\, Dr
ell-Yan\, top pair and dijet production\, the necessary precision is only
achieved if one calculates the next-to-next-to leading order term in the
perturbative expansion of the cross section. The cross section then consis
ts of different pieces\, each of which is separately divergent. Moreover\,
and this is usually the major technical obstacle\, the singularities of e
ach piece have an intricate\, overlapping structure. I will present in thi
s seminar a new approach to disentangling the overlapping singularities of
both the double virtual and the double real part\, based on non-linear ma
ppings.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1990
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tanja Branz on Effective approaches to meson stru
cture
DTSTART;VALUE=DATE-TIME:20101028T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1991@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Effective models are a valuable tool to get further informatio
n on hadron structure. Recently\, the hidden charm spectrum came into the
focus of interest due to the discovery of the charmonium-like X\,Y and Z m
esons. Since these states cannot be easily explained by the standard quark
onium assignment these unusual resonances can possibly offer new insights
into the issue of meson structure. \n\nWe study the structure of the Y(394
0)\, Y(4140) and Z+(4430) mesons as bound states of charmed mesons [1\,2].
In particular we discuss a possible interpretation of the Y(3940) and Y(4
140) mesons as hadronic molecules\, where the Y(3940) state is considered
as a superposition of D*(+)D*(-) and D*(0) D*(0)bar\, while the Y(4140) i
s a bound state of Ds*(+) and Ds*(-) mesons. The Z+ is a special case sinc
e a conventional quark-antiquark structure can be ruled out. The Z+ is ass
umed to be composed of a D* and the axial D_1(2420).\n\nWe analyze the hid
den charm and radiative decay properties in an effective Lagrangian approa
ch and test our predictions with available data.\n\nBesides the above ment
ioned method based on effective Lagrangians we also use a holographic AdS/
QCD approach to get further insight into hadron structure. As a first appl
ication we calculated the mass spectrum and decay constants of convention
al mesons made up of a valence quark-antiquark pair [3]. In this context w
e studied mesons ranging from the light to the double heavy quark sector.\
n\n[1] Tanja Branz\, Thomas Gutsche and Valery E. Lyubovitskij\, Phys. Rev
. D 80\, 054019 (2009)\n[2] Tanja Branz\, Thomas Gutsche and Valery E. Lyu
bovitskij\, Phys. Rev. D 82\, 054025 (2010)\n[3] Tanja Branz\, Thomas Guts
che and Valery E. Lyubovitskij\, arXiv:1008.0268 (2010)
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1991
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Rutger Boels on A recursive solution of the Yang-
Mills theory S-matrix to arbitrary loop order?
DTSTART;VALUE=DATE-TIME:20101102T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1992@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Scattering amplitudes are important in many seemingly distant
corners of high energy physics\, such as the corner containing the LHC sta
rting up in Geneva as well as the corner with maximally supersymmetric Yan
g-Mills theory in four dimensions. The challenge in both these corners is
to compute scattering amplitudes to high leg and loop order. Even with sta
te-of-the art methods developed in recent years it remains however a chall
enge to reach beyond the one loop order\, especially in QCD. In this talk
I will discuss a possible extension of Britto-Cachazo-Feng-Witten (BCFW) o
n-shell recursion relations from the tree to arbitrary loop level. These r
elations allow one at tree level to compute any scattering amplitude from
scattering amplitudes with fewer legs. A key step in the derivation at tre
e level was the so-called large BCFW-shift behavior of the scattering ampl
itudes. A derivation of this will be presented in this talk which is indep
endent of the loop order and shows that the *integrand* of scattering ampl
itudes can be reconstructed from its so-called 'single cuts'. The differen
ce of a shift of the integrand and the integrals will be made manifest at
one loop order for the important case of pure Yang-Mills theory. I will ex
plain how and why these result suggests that the perturbation theory of Ya
ng-Mills theory is much simpler than one might expect and might lead to a
completely recursive solution to any Yang-Mills theory.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1992
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christoph Englert on Recent results in diboson+je
t phenomenology
DTSTART;VALUE=DATE-TIME:20101109T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1993@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:At hadron colliders such as the CERN Large Hadron Collider\, e
lectroweak boson production in association with jets represents important
signal processes as well as backgrounds to future searches beyond the Stan
dard Model. In particular\, the processes phenomenology allows to develop
a better understanding of the mechanism of electroweak symmetry breaking b
y observing deviations of electroweak couplings from their standard model
expectation\, or new propagating degrees of freedom. \nA theoretically dee
per understanding of electroweak physics might however be obscured by unkn
own higher-order QCD effects\, which are known to turn out sizable.\nThere
fore\, reliable simulations of signal and background processes require at
least next-to-leading order QCD precision of cross sections and differenti
al distributions to be taken into account when analyzing experimental data
. After having reviewed the details of NLO QCD computations in a fully-fle
xible Monte Carlo framework\, I discuss recent results in diboson+jet prec
ision phenomenology in this talk.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1993
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: canceled on n/a
DTSTART;VALUE=DATE-TIME:20101116T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1994@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:n/a
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1994
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Georgi Dvali on UV-completion by classicalization
DTSTART;VALUE=DATE-TIME:20101118T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1995@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Lorentz-Raum\, 05-127
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1995
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Guido Bell on Hadronic B decays
DTSTART;VALUE=DATE-TIME:20101123T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1996@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Most of the observables that have been measured at the B physi
cs experiments fall into the class of exclusive hadronic decays. A quantit
ative theoretical understanding of the underlying strong-interaction effec
ts is both challenging and mandatory for an unambiguous interpretation of
the collected data. I will review different strategies to address this pro
blem\, present recent conceptual developments and discuss some unresolved
puzzles which may provide hints to CP violating phases beyond the CKM mech
anism.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1996
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thorsten Feldmann on Flavour Symmetries and Minim
al Flavour Violation
DTSTART;VALUE=DATE-TIME:20101126T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1997@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Starting from the general concept of minimal flavour violatio
n (MFV) in the context of new physics constructions\, I discuss recent de
velopments related to spontaneously broken flavour symmetries at (relativ
ely) low energies\, leading to MFV or variations thereof.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1997
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Beneke on Leptogenesis from first principl
es -- flavour (de)coherence
DTSTART;VALUE=DATE-TIME:20101207T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1998@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1998
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: German Rodrigo on The top quark charge asymmetry
at Tevatron and the LHC
DTSTART;VALUE=DATE-TIME:20101213T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:1999@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The most recent measurements at Tevatron of the charge asymmet
ry in top-antitop quark pair production reduce the discrepancy with the St
andard Model from 2sigma to 1.7sigma\, and open a little window\, at 95% C
.L.\, for negative contributions to the charge asymmetry beyond the SM. We
update our analysis for colour octet gauge bosons or axigluons in flavour
universal and flavour non universal scenarios. We review other possible m
odels and make an educated guess on their parameter space allowed by the n
ew measurements. Finally\, we comment on the prospects to measure the char
ge asymmetry at the LHC.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/1999
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: NN on n/a
DTSTART;VALUE=DATE-TIME:20101221T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2000@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:n/a
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2000
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Bj?rn O. Lange on Glauber Moden in Soft-Collinear
Effective Theory und
DTSTART;VALUE=DATE-TIME:20110110T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2001@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Die Physik niedriger Energien wird mithilfe effektiver Theorie
n wie beispielsweise SCET beschrieben\, in der typischerweise softe und ko
llineare Effekte durch eigene Quantenfelder -- sogenannten Moden -- erzeug
t werden. Wir betrachten ein einfaches Beispiel aus dem Drell-Yang Prozess
und analysieren\, welche Moden tats?chlich ben?tigt werden\, um die infra
rote Physik zu beschreiben. Dabei finden wir (erneut) die sogenannte Glaub
er Mode\, die explizit nicht on-shell sein kann\, und somit keine L?sung d
er Landau Gleichungen ist. Um dieses Problem zu l?sen\, bedarf es entweder
der Ausintegrierung der Glauber Moden zu einem effektiven Potential\, ode
r einer Modifizierung der Landau Gleichungen selbst. Wir diskutieren eine
solche Modifizierung und die daraus entstehende Problematik.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2001
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dario Benedetti on Lattice Quantum Gravity
DTSTART;VALUE=DATE-TIME:20110118T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2002@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Of the various approaches that attempted a non-perturbative qu
antization of gravity along the lines of standard quantum field theories o
n a lattice\, Causa Dynamical Triangulations (CDT) seem the most successfu
l to date. In this talk\, I will review the construction and major results
of CDT\, I will present some recent results\, and I will highlight possib
le connections to asymptotic safety and to Horava-Lifshitz gravity.
LOCATION:Lorentz-Raum (05-127)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2002
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gudrun Hiller on Der Vortrag muss wegen Krankheit
leider ausfallen.
DTSTART;VALUE=DATE-TIME:20110125T153000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2003@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:n/a
LOCATION:Muss wegen Krankheit heute leider ausfallen!
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2003
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ling Bao on Supergravity Constraints from the E10
Model
DTSTART;VALUE=DATE-TIME:20110201T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2004@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the neighborhood of a spacelike singularity\, eleven-dimens
ional supergravity has exceedingly interesting algebraic properties. The d
ynamics in this limit can be described as a geodesic motion on the infinit
e-dimensional hyperbolic coset space E10/K(E10). We will discuss various a
spects of the correspondence between these two models\, concentrating most
ly on the bosonic sector. In particular the constraint algebra of the supe
rgravity theory will be addressed\, which has a generalization in the hype
rbolic coset model via a Sugawara-type construction.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2004
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tilman Plehn on Boosted Tops at the LHC
DTSTART;VALUE=DATE-TIME:20110208T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2005@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will briefly review some recent developments to address diff
erent experimental issues in Higgs and new physics searches by looking for
so-called fat jets. These are jets from heavy particles\, like a Higgs bo
son or a top quark\, which decay to hadronic final states. Such fat jets c
an be tagged and reconstructed in analogy to a bottom jet. For example\, a
top tag allows us to extract supersymmetric top squark signals from their
overwhelming backgrounds.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2005
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Heute leider kein Theorie-Palaver on n/a
DTSTART;VALUE=DATE-TIME:20110215T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2006@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:n/a
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2006
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Marcela Carena on SUSY Frameworks at Hadron Colli
ders
DTSTART;VALUE=DATE-TIME:20101130T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2044@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Lorentz-Raum (Institut für Physik\, 05-127)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2044
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: R. Keith Ellis on The hadronic production of a W-
boson and heavy quarks
DTSTART;VALUE=DATE-TIME:20101215T160000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2053@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I present the results of a one-loop calculation of the product
ion of a heavy quarks in association with a W-boson\, retaining the mass
for the heavy quark. Using a special choice for the heavy quark spinors
we obtain analytic expressions for the one-loop amplitudes which are am
enable to fast numerical evaluation. The full next-to-leading order (NLO
) calculation of hadron + hadron → W(→ eν)b¯bwith massive b-quarks
is included in the program MCFM. A comparison is performed with previou
s published work.
LOCATION:Newton-Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2053
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Antonio Enrique Carcamo Hernandez on Composite Ve
ctors and Scalars in Theories of Electroweak Symmetry Breaking
DTSTART;VALUE=DATE-TIME:20110204T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2054@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the context of a strongly coupled Electroweak Symmetry Brea
king\, composite triplet of heavy vectors belonging to the SU(2)_{L+R} adj
oint representation and a composite scalar singlet under SU(2)_{L+R} may a
rise from a new strong interaction invariant under the global SU(2)_L×SU(
2)_R symmetry\, which is spontaneously broken down to SU(2)_{L+R}. The fir
st part of the talk is devoted to the study of the heavy composite vector
pair production at the LHC via Vector Boson Fusion and Drell-Yan annihilat
ion under the assumption that the interactions among these heavy vector st
ates and with the Standard Model gauge bosons are described by a SU(2)_L
× SU(2)_R /SU(2)_{L+R} Effective Chiral Lagrangian. The expected rates of
multi-lepton events from the decay of the composite vectors are also give
n. The second part discusses the associated production at the LHC of a com
posite vector with a composite scalar by Vector Boson Fusion and Drell-Yan
annihilation in the framework of a SU (2)L × SU (2)R /SU (2)L+R Effectiv
e Chiral Lagrangian with massive spin one fields and one singlet light sca
lar. The expected rates of same sign di-lepton and tri-lepton events from
the decay of the composite vector and composite scalar final state are com
puted. The connection of the Effective Chiral Lagrangians with suitable ga
uge models is elucidated.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2054
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexander Kagan on The Top Quark Forward Backward
Asymmetry\, Flavor\, and New Strong Interactions
DTSTART;VALUE=DATE-TIME:20110419T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2100@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2100
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christian Gross on Flavorful hybrid anomaly-gravi
ty mediation
DTSTART;VALUE=DATE-TIME:20110426T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2101@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We study models with contributions of similar size to the soft
masses from anomaly- and gravity mediation\, thereby curing the tachyonic
slepton problem of anomaly mediation. A possible origin of this hybrid se
tup in a 5-dimensional brane world is briefly discussed. The absence of ex
cessive flavor violation is explained by alignment. The gravitino can be h
eavy enough so that the gravitino problem of supersymmetric theories with
leptogenesis is avoided. The model has a characteristic signature: It pred
icts the distinctive gaugino mass pattern of anomaly mediation and\, at th
e same time\, O(1) slepton mass splittings.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2101
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Wieland Staessens on Holographic Thermalization
DTSTART;VALUE=DATE-TIME:20110503T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2102@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Using the AdS/CFT correspondence\, we propose a method to stud
y the thermalization of strongly coupled field theories\, via calculations
of two-point functions\, Wilson loops and the entanglement entropy in 2\,
3 and 4 dimensions. In the saddlepoint approximation these probes are com
puted in the gravity dual in terms of invariant geometric objects (geodesi
cs\, minimal surfaces and minimal volumes). Applying this method to field
theories which are perturbed by a sudden injection of energy\, we can dedu
ce some universal features concerning the thermalization properties of str
ongly coupled field theories with a gravity dual.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2102
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Piero Nicolini on Quantum black holes: the effect
of a minimal length
DTSTART;VALUE=DATE-TIME:20110510T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2103@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:By implementing an effective minimal length in Einstein equati
ons\, we will present a new class of quantum gravity corrected spacetimes\
, describing both neutral and charged black holes. We will also analyze
the above new solutions in the presence of extra dimensions and their rele
vance for the conjectured production of mini black holes in extreme energy
hadron collisions. Finally we will discuss recent developments and possi
ble connections with other approaches in this field.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2103
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christoph Schmell on The inclusive radiative deca
y B -> X_s gamma in the Randall-Sundrum model
DTSTART;VALUE=DATE-TIME:20110517T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2104@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Flavor-changing neutral currents like the weak B meson decay B
-> X_s gamma are very important processes for the investigation of New Ph
ysics (NP) as they do not occur on tree-level in the Standard Model (SM).
In recent years\, one achieved an enhanced accuracy in measurements of the
se processes at the B factories so that it is worth considering them in NP
models. Concerning the mentioned B meson decay\, people are interested in
the Wilson coefficient C_{7gamma}\, since this coefficient is relevant fo
r all associated observables.\nOne possibility for NP is the Randall-Sundr
um model (RS) characterized by a five-dimensional space-time where the com
pact extra dimension is warped. This leads to an infinite number of massiv
e so-called Kaluza-Klein excitations of all SM particles. Furthermore\, al
l massive gauge bosons have flavor-violating couplings to fermions\, so th
at the contributions of the RS model to C_{7gamma} are expected to be sign
ificant.\nIn my talk I will present the calculation of C_{7gamma} in the R
andall-Sundrum model and its effects on observables such as the branching
ratio\, the CP asymmetry and the photon polarization ratio.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2104
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sophy Palmer on Vector boson fusion: The MSSM\, e
lectroweak corrections and VBFNLO
DTSTART;VALUE=DATE-TIME:20110531T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2105@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:One of the primary goals of the LHC is to investigate the meth
od of electroweak symmetry breaking. Higgs production via vector boson fu
sion (VBF) is an extremely promising channel\, both as a discovery method
and as a means of studying the Higgs boson and its couplings. \nThe electr
oweak corrections to this process\, in both the Standard Model and MSSM\,
are important - they are of the same order of magnitude as the QCD correct
ions\, and need to be considered in order to make accurate predictions for
this channel. The new release of VBFNLO includes the electroweak correct
ions to VBF Higgs production in the SM and (complex) MSSM\, as well as man
y new important signal and background processes at NLO QCD level\, togethe
r with various other BSM effects.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2105
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Peter Athron on Exceptional Supersymmetry at the
LHC
DTSTART;VALUE=DATE-TIME:20110607T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2106@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Supersymmetry is one of the best motivated possibilities for n
ew physics discovery at the Large Hadron Collider. In addition to the com
monly studied Minimal Supersymmetric Standard Model\, Supersymmetry (MSSM)
may also be realised in non-minimal SUSY models. I will motivate and des
cribe non-minimal realisations of supersymmetry\, with a particular focus
on the Exceptional Supersymmetric Standard Model (E6SSM)\, inspired by Gra
nd Unified Theories based on the E6 exceptional Lie group. The E6SSM mat
ter content fills three generations of E6 multiplets\, thus predicting exo
tic new matter and\, inspired by E6 breaking\, has an extra U(1)_N gauge g
roup broken at low energies (along with the EW symmetry)\, which solves th
e mu-problem of the MSSM. I will discuss the phenomenology including deta
iled mass spectra\, with particular reference to the LHC\, as well as disc
ussing other recent progress.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2106
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pietro Falgari on Off-shell and non-factorizable
effects in single-top hadroproduction
DTSTART;VALUE=DATE-TIME:20110614T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2107@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Calculations involving massive unstable particles are very oft
en performed in the so-called narrow-width approximation\, in which the cr
oss section is factorized into production and decay of an on-shell massive
particle. In this approach off-shell effects and non-factorizable correct
ions\, arising from interference of the production and decay subprocesses\
, are neglected. While these effects are known to be negligible for total
cross sections\, they could a priori be sizeable for an arbitrary observab
le involving several kinematical cuts\, and thus relevant for hadron-colli
der phenomenology. In this talk I present NLO results for single-top produ
ction in hadron collisions which include the aforementioned off-shell and
non-factorizable effects\, thus extending earlier results beyond the narro
w-width approximation. The calculation relies on effective-theory techniqu
es and involves a simultaneous expansion of the amplitudes in powers of th
e couplings and of the virtuality p_t^2-mt^2 ~ Gamma_t/mt of the intermedi
ate resonant top-quark. After a general introduction and illustration of t
he method I will discuss details of the calculation and present numerical
results for the total cross section and a selection of kinematical distrib
utions for single-top production at Tevatron and LHC.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2107
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jamie Tattersall on Spin determination at the LHC
DTSTART;VALUE=DATE-TIME:20110621T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2108@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Many models of new physics that have the potential to be seen
at the LHC show a remarkably similar phenomenology. For example\, both Sup
ersymmetry and models with Universal Extra Dimensions solve the hierarchy
problem and predict a doubling of the standard model particle content. How
ever\, an unambiguous difference between the two models is the spin of the
new particles that may be discovered. We discuss methods that may be able
to measure the spin of the new states at the LHC and thus determine the m
odel of new physics.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2108
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sebastian Bodenstein on Precision Determinations
of Heavy Quark Masses
DTSTART;VALUE=DATE-TIME:20110628T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2109@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, we look at recent progress made in determining
heavy quark masses\, with a particular focus on the charm quark mass. Inte
restingly\, the precision achieved from lattice and sum-rule based approac
hes are comparable at the moment\, providing a non-trivial consistency che
ck on both methods.\nAfter giving a critical discussion focusing on the cu
rrent sum-rule methods\, we also look at the prospects for improving the p
recision of the heavy quark masses.\nFinally\, we show how a technique dev
eloped in quark mass determinations can be used to give a rigorous\, firs
t principles determination\, of the heavy quark contribution to the lowest
order hadronic contribution of the muon magnetic anomaly.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2109
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: SONDERTERMIN: Tobias Huber on Two-loop QCD correc
tions to non-leptonic B decays
DTSTART;VALUE=DATE-TIME:20110706T160000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2110@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will report on the two-loop correction to the t
ree amplitude in QCD factorisation. After a motivation for the calculation
and a short technical part I will present the phenomenological results fo
r B -> pi pi \, rho rho \, and rho pi decays. I will also briefly address
the calculation of the two-loop correction to the penguin amplitude.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2110
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andreas von Manteuffel on Top-quark pair producti
on at 2 loops
DTSTART;VALUE=DATE-TIME:20110712T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2111@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:At the LHC\, top-quark pair production is an important process
to test the\n\nStandard Model and search for new physics. For the gluon f
usion channel\,\n\nI present an analytical calculation of the leading colo
ur and light fermionic\n\nvirtual corrections at NNLO in QCD. This include
s a discussion of technical\n\nsolutions employed in the calculation\, suc
h as a fully parallelised computer\n\nprogram for the reduction of Feynman
integrals to master integrals and methods\n\nto solve the master integral
s.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2111
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Benjamin Fuks on QCD resummation for Drell-Yan-li
ke processes beyond the Standard Model
DTSTART;VALUE=DATE-TIME:20110719T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2112@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:When studying the transverse-momentum (pT) distribution of a p
roduced colorless final state (e.g. slepton or gaugino pair in supersymmet
ric models or lepton pair in Z’ models)\, it is convenient to separate t
he large- and small-pT regions. For the large values of pT\, the use of th
e fixed-order perturbation theory is fully justified\, but in the small-pT
region\, the coefficients of the perturbative expansion are enhanced by p
owers of large logarithmic terms. Furthermore\, at the production threshol
d\, the mismatch between virtual corrections and phase-space suppressed re
al-gluon emission leads also to the appearance of large logarithmic terms.
Accurate theoretical calculations must then include soft-gluon resummatio
n in order to obtain reliable perturbative predictions and properly take t
hese logarithms into account. We present precision calculations for slepto
n-pair\, gaugino-pair and Z’ production at hadron colliders\, matching t
ransverse-momentum spectra\, invariant-mass distributions and total cross
sections obtained with the use of resummation with those obtained through
pure perturbative calculations. We compare then the resummed results with
those provided by Monte Carlo generators such as MC@NLO or PYTHIA\, and st
udy the impact of scale variations\, parton densities\, and non-perturbati
ve effects.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2112
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Paul Archer on Flavour Physics in the Soft Wall M
odel
DTSTART;VALUE=DATE-TIME:20110524T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2176@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:While the Randall and Sundrum (RS) model offers a compelling d
escription of flavour\, it is none the less plagued by a number of problem
s. In particular it suffers from tight constraints coming from Kaon physic
s. Here we look to extend the RS description of flavour into models with a
soft wall (SW). In the SW model the IR brane is removed and the extra dim
ension extends to infinity. A discrete KK spectrum is obtained by smoothly
cutting off the space with a `dilaton' field. Critically the space necess
arily requires a bulk Higgs which in turn results in a change in the range
of possible fermion masses and a significant reduction in the constraints
from observables such as epsilon_K.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2176
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Roman Derco on Instantons and Unitarily Inequival
ent Quantum Vacua
DTSTART;VALUE=DATE-TIME:20110830T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2206@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2206
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Bauer on Solving the Flavor Problem in War
ped Extra Dimensions
DTSTART;VALUE=DATE-TIME:20111025T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2224@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Extensions of the Standard Model (SM) featuring warped extra d
imensions (Randall-Sundrum models) have a build-in protection mechanism\,
called RS-GIM\, which prevents the occurrence of large flavor changing ne
utral currents. This mechanism is extremely successful and brings the RS m
odel into agreement with a new physics scale of a few TeV in almost all fl
avor sectors. The single exception is CP violation in K-Kbar mixing\, whic
h receives excessive contributions from mixed-chirality operators absent i
n the SM. This is the so-called flavor problem of warped extra dimensions
. \nWe have recently shown that an extension of the strong interaction bul
k gauge group can cancel these contributions to first order in the new-phy
sics scale\, so that the extended RS model represents a consistent theory
of flavor at the TeV scale.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2224
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anna Kulesza on Improving predictions for coloure
d SUSY particle production with the help of resummation
DTSTART;VALUE=DATE-TIME:20111115T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2225@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The dominant production processes of supersymmetric particles
at the LHC are those involving production of a pair of coloured particles\
, i.e.\nsquarks and gluinos. In this talk I will discuss the effects of so
ft gluon emission on the pair-production of squarks and gluinos in hadroni
c collisions. The soft gluon effects provide a major contribution to highe
r order QCD corrections and can be treated systematically to all orders by
means of resummation techniques. I will report on the calculation of the
threshold-resummed total cross sections for all squark and gluino pair-pro
duction processes in hadronic collisions. The predictions for these cross
sections at the LHC with 7 TeV collision energy will be presented.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2225
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Simon Plätzer on Improving Parton Showers
DTSTART;VALUE=DATE-TIME:20111122T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2226@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will review recent developments for improving parton showers
by NLO calculations and present first steps towards including subleading-
\\(N_c\\) contributions within the framework of dipole-type showers.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2226
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Oliver Schlotterer on Hunting Strings at LHC
DTSTART;VALUE=DATE-TIME:20111129T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2227@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Phenomenological aspects of weakly coupled low mass string the
ory become testable at the Large Hadron Collider provided that the string
mass is as low as a few TeV -- which is possible in scenarios with large e
xtra dimensions. I will give a brief introduction to string theory and Sta
ndard Model realizations therein and then discuss four- and five point sca
ttering processes involving quarks and gluons at the leading order of stri
ng perturbation theory. Particular emphasis will be put on their model-ind
ependent\, universal features. These amplitudes exhibit resonant behaviour
at the parton center of mass energies equal to the masses of stringy vibr
ation modes and might therefore provide a first experimental evidence for
string theory in the near future.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2227
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Klasen on Precision Predictions for SUSY
dark matter
DTSTART;VALUE=DATE-TIME:20111206T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2228@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:One of the attractive features of supersymmetric models is the
ir prediction of an (at least approximately) stable dark matter candidate
. The WMAP and Planck satellites impose stringent constraints on the dark
matter relic density and thus on the viable supersymmetric parameter space
. At the same time\, observations of a positron excess from the galactic
center and of an annual modulation of single-hit scintillation events fro
m Pamela\, ATIC\, Fermi and Dama-Libra have triggered speculations about i
ndirect and direct evidence for dark matter. In this talk\, we focus on re
cent advances in precision predictions for dark matter annihilation proces
ses in minimal supersymmetric models and discuss the implications of their
non-minimal extensions for present and future dark matter signals.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2228
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: -- no seminar -- on --
DTSTART;VALUE=DATE-TIME:20111213T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2277@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2277
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Professor A. Ashtekar on Evaporation of 2-d Black
Holes: Why there is no Information Loss
DTSTART;VALUE=DATE-TIME:20111111T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2278@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Left to themselves\, black holes evaporate through quantum pro
cesses. In the external field approximation their radiation is well-approx
imated by a thermal state. Therefore it first appears that one could form
a black hole through the gravitational collapse of a pure state and at the
end of evaporation one would be left with a mixed thermal state. This rea
soning leads to the "issue of information loss." Through a 2-dimensional m
odel that mimics many features of the 4-d spherical black holes\, I will s
how that several of the standard assumptions about the evaporation process
are flawed and argue that there is in fact no information loss because th
e quantum space-time is larger than what one might naively expect. This an
alysis also brings out unexpected universalities associated with the evapo
ration process.
LOCATION:Minkowski-Raum (R. 05-119\, Institut für Physik)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2278
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jack Laiho on Asymptotic Safety and Lattice Quant
um Gravity
DTSTART;VALUE=DATE-TIME:20111108T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2285@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I present recent results from lattice quantum gravity\, includ
ing evidence that an explicitly covariant formulation has a reasonable sem
i-classical limit. Our calculations show that the formulation has a runnin
g effective dimension that takes a value close to four at large distance s
cales. I will discuss the implications for Weinberg's asymptotic safety sc
enario.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2285
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: No talk today on Allhallows
DTSTART;VALUE=DATE-TIME:20111101T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2288@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2288
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Yeo Woong Yoon on NLO contribution to the pole ma
ss of the gluino in minimal gauge mediation
DTSTART;VALUE=DATE-TIME:20111220T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2295@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The pole mass of the gluino begins to arise at one-loop order
and the two-loop order correction shifts the leading order pole mass by ty
pically 10%. This shift can be larger than the expected accuracy of the ma
ss determination at the LHC and should be reckoned with for precision stud
ies on the SUSY breaking parameters. I will report on our recent computati
on of the pole mass of the gluino in the minimal gauge mediation to two-lo
op order. And I will discuss the phenomenology and future prospect.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2295
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thomas Flacke on Precision constraints on UED mod
els and implications for the LHC
DTSTART;VALUE=DATE-TIME:20120110T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2296@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In models with Universal Extra Dimensions (UED)\, the mass spe
ctrum of Kaluza-Klein partners of the Standard Model particles depends on
the size of the extra dimension as well as on bulk and boundary localized
higher dimensional operators and mass terms. We show that bounds from fla
vor physics and electroweak precision tests strongly constrain these opera
tors. The constraints imply characteristic patterns in the Kaluza-Klein ma
ss spectrum as well as their interactions which are tested at the LHC.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2296
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jérôme Charles on Implications of recent data o
n CKM analyses
DTSTART;VALUE=DATE-TIME:20120117T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2297@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will review the current status of the CKM matrix and CP viol
ation in the quark transitions\, with special emphasis on the interpretati
on of the most recent data.
LOCATION:Gernot-Gräff-Raum 05-431
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2297
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Eloisa Bentivegna on Black-hole lattices and inho
mogeneous dust: modelling the three-dimensional universe with numerical re
lativity
DTSTART;VALUE=DATE-TIME:20120124T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2298@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:After an introduction to the motivation and current approaches
to modelling inhomogeneities in cosmology\, I will present numerical rela
tivity as a complementary tool in this area. I will describe the state-of-
the-art infrastructure used in numerical-relativity studies related to gra
vitational waves\, and explain what extensions and caveats are needed when
applying this infrastructure to cosmological spacetimes. I will discuss t
wo examples of numerical spacetimes that have a cosmological relevance: th
e evolution of a regular black-hole lattice and that of a three-torus fill
ed with an inhomogeneous pressureless fluid. I will conclude with an overv
iew of the road ahead.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2298
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Stefano Pozzorini on Scattering Amplitudes with O
pen Loops
DTSTART;VALUE=DATE-TIME:20120131T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2299@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will present a numerical one-loop algorithm\, introduced in
arXiv:1111.5206 [hep-ph]\, which is based on the recursive construction of
loop-momentum polynomials called open loops. This novel approach permits
to generate one-loop scattering amplitudes for multi-particle processes i
n a fully automatic and highly efficient way.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2299
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andreas Weiler on Flavor and CP Invariant Composi
te Higgs Models
DTSTART;VALUE=DATE-TIME:20120207T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2300@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The flavor protection in composite Higgs models with partial c
ompositeness is known to be insufficient. We explore the possibility to al
leviate the tension with CP odd observables by assuming that flavor or CP
are symmetries of the composite sector\, broken by the coupling to Standar
d Model fields. We show how to avoid the previously problematic tension be
tween a flavor symmetric composite sector and electro-weak precision tests
. Some of the light quarks are substantially or even fully composite with
striking signals at the LHC. We discuss the constraints from recent dijet
mass measurements and give an outlook on the discovery potential. We also
present a different protection mechanism where we separate the generation
of flavor hierarchies and the origin of CP violation. This can eliminate o
r safely reduce unwanted CP violating effects\, realizing effectively “M
inimal CP Violation” and is compatible with a dynamical generation of fl
avor at low scales.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2300
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Timo Weigand on Non-perturbative F-theory vacua f
or SU(5) Grand Unified Theories
DTSTART;VALUE=DATE-TIME:20120214T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2301@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:F-theory provides an intriguing non-perturbative formulation o
f certain string compactifications to four dimensions. Dynamical aspects o
f fields and branes are translated into geometric properties of an underly
ing elliptic fibration\, which can be analysed in great detail with the he
lp of algebraic geometry.\nAt the same time\, such constructions offer a c
onnection to phenomenological models of Grand Unified Theories (GUTs) by c
ombining two essential ideas in model building: the importance of exceptio
nal gauge groups and the localisation of matter on so-called brane worlds.
\n\nIn this talk we give an elementary introduction to brane worlds from t
he perspective of F-theory and outline some of their phenomenological prop
erties. This includes an outline of the connection between gauge dynamics
and the singularities of the compactification space and a survey of recent
progress in the construction of explicit F-theory GUT vacua.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2301
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Carlos Wagner on Higgs Physics at the 7 TeV LHC
DTSTART;VALUE=DATE-TIME:20111124T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2316@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Newton-Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2316
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Andres Reyes on Entanglement\, von Neumann En
tropy and the GNS construction
DTSTART;VALUE=DATE-TIME:20120417T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2403@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Newton-Raum (Geb. 2413\, 01-122)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2403
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Bernd Jantzen on Asymptotic expansions with t
he strategy of regions
DTSTART;VALUE=DATE-TIME:20120508T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2404@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:When loop integrals involve many different scales from masses
and kinematical parameters\, it can be hard or even impossible to evaluate
them exactly. The integrand may be simplified before integration by explo
iting hierarchies of parameters and expanding in powers of small parameter
ratios. Naive expansions of the integrand often generate new singularitie
s\, but there are sophisticated methods of asymptotic expansions to solve
this problem. One of them is the so-called "strategy of regions" or "expan
sion by regions" developed by Beneke and Smirnov in 1997. It expands the i
ntegrand according to the scaling prescriptions of a set of regions and in
tegrates all expanded terms over the whole integration domain. This method
has been applied successfully to many complicated loop integrals\, but a
general proof for the correctness of its prescriptions has not been availa
ble.\nThis talk shows how the expansion by regions manages to reproduce th
e exact result correctly in an expanded form and clarifies the conditions
on the choice and completeness of the considered regions. A generalized ex
pression for the full result is presented that involves additional overlap
contributions. These extra pieces normally yield scaleless integrals whic
h are consistently set to zero\, but they may be needed depending on the c
hoice of the regularization scheme.\nThe talk illustrates the application
of the expansion by regions using a variety of simple\, pedagogical one-lo
op examples.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2404
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Jens Braun on Aspects of gauge theories with
few and many fermion flavors
DTSTART;VALUE=DATE-TIME:20120515T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2405@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The existence of universal behavior plays a very important rol
e in modern physics since it allows us to classify theories according to t
heir scaling behavior close to a critical point. In this talk\, we analyze
the scaling behavior of physical observables in strongly-flavored asympto
tically free gauge theories. Such theories approach a quantum critical poi
nt when the number of fermion flavors is increased. Close to this critical
point\, physical observables then exhibit an exponential scaling behavior
\, provided the gauge coupling is considered as a constant (external) para
meter. We discuss how this exponential scaling behavior is modified when t
he scale dependence of the gauge coupling is taken into account. In partic
ular\, we present estimates for the size of the regime with an exponential
scaling behavior in QCD with \\(N_f\\) fermion flavors and \\(N_c\\) colo
rs. Our results suggest that the corrections to this exponential behavior
might be relevant for the analysis of lattice QCD data.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2405
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Gil Paz on The Charge Radius of the Proton\,
a Five Sigma Discrepancy?
DTSTART;VALUE=DATE-TIME:20120522T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2406@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The charge radius of the proton is a basic non-perturbative p
arameter.\nRecently\, it was extracted for the first time from the Lamb sh
ift in muonic hydrogen. For a long time it was anticipated that such a mea
surement would reduce the error by an order of magnitude compared to measu
rements from electron- proton scattering and regular hydrogen spectroscopy
. While this goal was achieved\, the value of the proton¹s charge radius
that was obtained was\, very surprisingly\, five standard deviations away
from the world average.\n\nThe extraction of the charge radius from the La
mb shift in muonic hydrogen depends on a theoretical input. Together with
Richard J. Hill\, we are studying the hadronic uncertainty in the theoreti
cal prediction using the tool of an effective field theory\, namely NRQED.
In the talk I will describe the results of this study. I will also descr
ibe a previous study of the model-independent extraction of the charge rad
ius from electron-proton scattering We have shown that previous extraction
s\, spanning a period of over 40 years\, have underestimated their error s
ometimes by a factor of two or more.
LOCATION:Hörsaal Kernphysik
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2406
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Fickinger on Precision determination of a
lpha_S(m_Z) from thrust data
DTSTART;VALUE=DATE-TIME:20120529T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2407@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will present an extraction of the strong coupling constant\,
alpha_S(m_Z)\, from thrust data using Effective Field Theory techniques.
Our calculation yields one of the most precise measurements of alpha_S(m_Z
) to date. We perform one fit in the tail region of the thrust distributio
n and a second fit for the first moment of the thrust distribution. Both f
its are simultaneous two parameter fit to all available data at center-of-
mass energies Q = 35 GeV to 207 GeV. We find alpha_S(m_Z) = 0.1135 +- (0.0
002)expt +- (0.0005)hadr +- (0.0009)pert for the tail fit\, and alpha_S(m_
Z) = 0.1140 +- (0.0004)exp +- (0.0013)hadr +- (0.0007)pert for the first m
oment fit. The displayed 1-sigma errors are the total experimental uncerta
inty\, the hadronization uncertainty\, and the perturbative theory uncerta
inty\, respectively.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2407
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Stefan Prestel on Improving parton showers with m
ulti-jet NLO calculations
DTSTART;VALUE=DATE-TIME:20120605T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2408@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:After reviewing merging of leading-order Matrix Elements with
Parton Showers in the so-called CKKW-L scheme\, I will argue how to extend
the method to allow for inclusion of virtual corrections. A prescription
to ensure NLO accuracy is presented and the implementation discussed for s
imple examples.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2408
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prof. Dr. Marco Zagermann on Elusive Semi-Classic
al de Sitter Vacua
DTSTART;VALUE=DATE-TIME:20120612T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2409@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Constructing explicit and well-controlled string compactificat
ions with a positive cosmological constant in four dimensions is a surpris
ingly difficult problem. This is illustrated by a summary of recent attemp
ts to find such de Sitter vacua at the classical level and under the inclu
sion of the best understood perturbative corrections.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2409
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Blaszczyk on Resolution of Toroidal Orbif
olds in Heterotic String Theory and its Phenomenology
DTSTART;VALUE=DATE-TIME:20120619T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2410@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The compactification of heterotic string theory on toroidal or
bifolds provides a promising variety of possible high energy completions o
f the standard model\, including the concepts of supersymmetry\, grand uni
fication and extra dimensions. The simplicity of orbifolds allows for exac
t string calculability\, however\, the theory has to be away from the orbi
fold point in moduli space. We describe the resolution of toroidal orbifol
ds in the context of gauged linear sigma models which allow for access to
big regions of the moduli space. The comparison of MSSM-like models at the
orbifold point and in the supergravity limit reveal properties of the low
energy effective action in the resolution process. The GUT breaking in do
ne via a freely acting Wilson line which assures full blowability with a n
on-anomalous hypercharge.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2410
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. David Straub on Less Minimal Flavour Violatio
n
DTSTART;VALUE=DATE-TIME:20120626T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2411@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:While the gauge hierarchy problem suggests the presence of new
physics around the TeV scale\, bounds from flavour physics require much
larger scales if flavour violation is generic. This tension could be reso
lved if the new physics is approximately invariant under a suitable flavo
ur symmetry. Indeed\, the quark sector of the Standard Model exhibits an
approximate U(2)^3 flavour symmetry under which the first two generations
transform as doublets and the third generation as singlets. In this talk
I discuss the consequences of assuming this symmetry to be approximately
respected by new physics in a general effective field theory framework\,
as well as in the two most popular solutions to the gauge hierarchy prob
lem: supersymmetry and models with a composite Higgs boson.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2411
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Christian Speckner on Compact HEIDI at the LH
C - Investigating new Physics with WHIZARD
DTSTART;VALUE=DATE-TIME:20120703T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2412@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Although it is quite likely that nature has something new in s
tore for us below the TeV scale (even if it might only be the Higgs boson)
\, it is less obvious whether this new piece of phyics would be visible at
the LHC. As an example of a potentially very elusive piece of new physics
\, I will present a slightly unorthodox but simple extension of the standa
rd model Higgs sector and a small study of its collider phenomenology usin
g the Monte Carlo package WHIZARD.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2412
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Stefan Zohren on Scale dependant spectral dim
ension in models of causal quantum gravity
DTSTART;VALUE=DATE-TIME:20120710T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2413@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In recent years several approaches to quantum gravity have fou
nd evidence for a scale dependent spectral dimension of space-time varying
from four at large scales to two at small scales of order of the Planck l
ength. The first evidence came from numerical results of four-dimensional
causal dynamical triangulations (CDT). Since then little progress has been
made in analytically understanding the numerical results coming from the
CDT approach and showing that they remain valid when taking the continuum
limit. In this talk we discuss a new toy model of "radially reduced" four-
dimensional CDT in which we can take the continuum limit analytically and
obtain a scale dependent spectral dimension varying from four to two with
scale. Furthermore\, the functional behaviour of the spectral dimension is
exactly of the form which was conjectured on the basis of the numerical r
esults.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2413
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Gero von Gersdorff on Universal contributions
to scalar masses from five dimensional supergravity
DTSTART;VALUE=DATE-TIME:20120717T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2414@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Supersymmetric models with a strongly coupled regime at high e
nergy can provide a very convincing theory of flavor. Their phenomenology
has been studied by many authors using either purely 4d models (supersymme
tric QCD) or 5d descriptions (the supersymmetric Randall Sundrum model).\n
I will argue that these models generically produce new contributions to so
ft terms due to the presence of meson resonances of the strongly coupled t
heory (the Kaluza Klein excitations of the extra dimension).\nI will expli
citly compute the scalar soft terms in a 5d setup and show that there exis
t fairly model-independent contributions that are tachyonic\, thus putting
strong new constraints on model building in these theories.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2414
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. José Zurita on Extended Higgs Sector at the
LHC
DTSTART;VALUE=DATE-TIME:20120424T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2416@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will describe the LHC phenomenology of two non-
standard Model Higgs sectors: the BMSSM and the Higgs portal.\nThe BMMSM c
onsists in extending the MSSM Higgs sector by higher-dimension operators.S
uch an effective field theory (EFT) approach\, allows for a model-independ
ent description that may correspond to the combined effects of additional
supersymmetric sectors\, such as heavy singlets\, triplets or gauge bosons
\, in which the supersymmetry breaking mass splittings can be treated as a
perturbation. Here I consider the 2011 LHC dataset\, to set exclusion lim
its on a large class of BMSSM model\, and present projections for integrat
ed luminosities of 5 and 15 fb−1\, assuming that the ATLAS and CMS colla
borations will combine their results in each channel. This study shows tha
t the majority of the parameter space will be probed at the 2σ level with
15 fb−1 of data. A non-observation of a Higgs boson with about 10 fb−
1 of data will point towards a Higgs SUSY spectrum with intermediate tan
β ( ≈ a few to 10) and a light SM-like Higgs with somewhat enhanced cou
plings to bottom and tau pairs. \nThe Higgs portal model consists of an ex
tra U(1) gauge symmetry\, under which the SM fields are singlets. The new
massive gauge boson (Z') gets mass via its own (dark) Higgs particle. The
"dark" world talks to the SM via an h^2 H^2 operator (The Z-Z' mixing is s
trongly constrained from experiment). Here I will also discuss the detecta
bility prospects at the LHC using the 2011 dataset\, and the future reach
of LHC on the parameter space of this model.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2416
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Guido Bell on Precision calculations for the
Large Hadron Collider
DTSTART;VALUE=DATE-TIME:20120510T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2447@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2447
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Richard J. Hill on Heavy particle effective t
heories: formalism and application to dark matter direct detection
DTSTART;VALUE=DATE-TIME:20120618T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2465@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The application of heavy particle effective field theory to th
e computation of dark matter-nucleus scattering is discussed. A simple cl
ass of composite models with universal features is presented. Relativist
ic invariance is implemented in such effective theories via infinite dimen
sional representations of the Lorentz group. General formalism and const
raints on the construction of effective theory operators is presented.
LOCATION:Newton-Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2465
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Sascha Turczyk on Constraining CP violation i
n neutral meson mixing with theory input
DTSTART;VALUE=DATE-TIME:20120716T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2472@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:There has been a lot of recent interest in the experimental hi
nts of CP violation in B0 mixing. \nThe D measurement of the semileptonic
CP asymmetry would - with higher signicance - be a clear signal of beyond
the standard model physics. In this talk I present a relation [arXiv:1203.
3545] for the mixing parameters\, which allows clearer interpretation of t
he data in models in which new physics enters in M_12 and / or Gamma_12. T
his result implies that the central value of the D measurement in B0 decay
is not only in conflict with the standard model\, but in a stronger tensi
on with data on Delta Gamma_12 than previously appreciated.\nAfter I deriv
ed the relation between the theoretical prediction of |Delta Gamma_12| and
the measurements of Delta M\, Delta Gamma and A_SL\, I will explain how t
his result can help to better understand the constraints on Delta Gamma_12
or A_SL\, whichever is less precisely measured.
LOCATION:Newton-Raum (Geb. 2413\, 01-122)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2472
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: PD Dr. Dennis Dietrich on Influence of dynamical
electroweak symmetry breaking on ultra-high-energy cosmic rays
DTSTART;VALUE=DATE-TIME:20121023T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2540@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We study the influence of dynamical electroweak symmetry break
ing on interactions of ultrahigh-energy cosmic rays. The additional gauge
sectors in these extension of the standard model can significantly modify
the cosmic-ray--air cross section and thus lead to the direct detection or
exclusion of a particular model as well as to explanations for features o
f the cosmic-ray spectrum.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2540
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Erik Gerwick on The causes (and effects) of s
caling in QCD jets
DTSTART;VALUE=DATE-TIME:20121030T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2541@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The probabilities for producing a given number of jets in a QC
D process follow universal scaling patterns. In this seminar I will revie
w our understanding of this feature based on analytic resummation and the
parton shower. \nI will highlight some applications for these ideas inclu
ding improved multi-jet searches and emphasize several control measurement
s where scaling may be tested in current analyses.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2541
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Theorie-Palaver fällt aus! on --
DTSTART;VALUE=DATE-TIME:20121106T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2542@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2542
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Mark Goodsell on WISPs from strings
DTSTART;VALUE=DATE-TIME:20121113T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2547@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:WISPs\, specifically the axion\, axion-like particles and hidd
en photons\, are being searched for in a wide variety of experiments (incl
uding MAMI) and astrophysical observations. I shall discuss some of their
phenomenology\, before describing how they can be found in the LARGE volum
e scenario (or more generally IIB string theory)\, what can be predicted f
or their properties\, and some remarks about cosmology. For hidden U(1)s\,
heterotic orbifolds can also yield interesting models and if time permits
I shall describe some work on these.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2547
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Cedric Studerus on Massive Vacuum Feynman Int
egrals at Five Loops
DTSTART;VALUE=DATE-TIME:20121120T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2548@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Massive Vacuum Feynman Integrals (tadpoles) occur in asymptoti
c expansion of Feynman diagrams in perturbative Quantum field theory.\nExa
mples are the calculation of the beta-function and anomalous dimensions of
e.g. QCD and the pressure in Thermal QCD at high temperature. In this tal
k\, I will focus on the beta-function of QCD and discuss the challenges on
meets at the five loop order.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2548
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Alexei Pivovarov on QCD effects in B->K^(*)l^
+l^- decays
DTSTART;VALUE=DATE-TIME:20121127T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2549@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Effects of strong interactions in B->K^(*)l^+l^- decays are di
scussed. In particular\, the calculation of long-distance contributions du
e to virtual c-quark loops is presented.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2549
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Marc Gillioz on Skyrmions in Composite Higgs
Models
DTSTART;VALUE=DATE-TIME:20121204T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2550@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The low-energy description of a strongly-interacting gauge the
ory is essentially independent of the nature of the gauge group\, but depe
nds rather on the global symmetries of the theory. Based on this observati
on\, a number of phenomenological models have been built in which the Higg
s field is a composite bound state of some strong dynamics (the equivalent
of the pion field in QCD). Composite Higgs models are merely sensitive to
their UV completions through anomalous couplings. However\, there is more
information contained in the low-energy effective description than just t
he dynamics of the pseudo-Goldstone bosons: the presence of topological so
litons (skyrmions) reveals the existence of stable composite state above t
he TeV scale\, and puts severe bounds on existing models.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2550
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Robert Richter on Discrete Symmetries in MSSM
D-brane compactifications
DTSTART;VALUE=DATE-TIME:20121211T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2551@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We study the presence of discrete gauge symmetries in D-brane
semi-realistic compacti?cations.\nAfter establishing the constraints for t
he presence of a discrete gauge symmetry we perform a systematic search fo
r discrete gauge symmetries within semi-realistic D-brane realizations of
the MSSM and the MSSM with three right-handed neutrinos.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2551
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Johannes Henn on The cusp anomalous dimension
at three loops and beyond
DTSTART;VALUE=DATE-TIME:20121218T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2552@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The anomalous dimension of a cusped Wilson loop appears in a n
umber of physical situations. For example\, it describes the infrared dive
rgences of processes involving heavy quarks. In this talk\, we discuss the
cusp anomalous dimension in N=4 super Yang-Mills. In a small angle limit
\, we obtain an exact result that interpolates between weak and strong cou
pling.\nFor generic angle\, we introduce a new limit that maps the computa
tion to a quantum mechanical problem. We also describe how the cusp anomal
ous dimension is related to the Regge limit of massive amplitudes on the C
oulomb branch of N=4 super Yang-Mills. This relation is used to obtain the
full three-loop answer. We discuss the structure of this result and point
out lessons that can be drawn for QCD.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2552
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Sheer El-Showk on New Skins for an Old Ceremo
ny (The Conformal Bootstrap and the Ising Model)
DTSTART;VALUE=DATE-TIME:20130115T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2553@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The existence of a positive linear functional acting on the sp
ace of (differences between) conformal blocks has been shown to rule out r
egions in the parameter space of conformal field theories (CFTs). We argue
that at the boundary of the allowed region the extremal functional contai
ns\, in principle\, enough information to determine the dimensions and OPE
coefficients of an infinite number of operators appearing in the correlat
or under analysis. Based on this idea we develop the Extremal Functional M
ethod (EFM)\, a numerical procedure for deriving the spectrum and OPE coef
ficients of CFTs lying on the boundary (of solution space). We test the EF
M by using it to rederive the low lying spectrum and OPE coefficients of t
he 2d Ising model based solely on the dimension of a single scalar quasi-p
rimary – no Virasoro algebra required. Our work serves as a benchmark fo
r applications to more interesting\, less known CFTs (such as the 3d Ising
model) in the near future.
LOCATION:Gernot-Gräff-Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2553
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dorival Gonçalves Netto on NLO Predictions for N
ew Physics in MadGOLEM
DTSTART;VALUE=DATE-TIME:20130205T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2555@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present completely general next-to-leading order prediction
s for squark and gluino production at the LHC\, based on the fully automat
ed MadGolem tool. Without any assumptions on the mass spectrum we predict
production rates and examine the structure of the massless and massive qua
ntum corrections. This allows us to quantify theory uncertainties induced
by the spectrum assumptions commonly made. Going beyond total rates we com
pare general fixed-order distributions to resummed predictions from jet me
rging. As part of this comprehensive study we present the MadGolem treatme
nt of ultraviolet\, infrared and on-shell divergences.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2555
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Joachim Kopp on Flavour Violating Higgs Decay
s
DTSTART;VALUE=DATE-TIME:20130108T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2556@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Flavour violating couplings of the Higgs boson to quarks or le
ptons are generically expected in many extensions of the Standard Model\,
for instance in multi-Higgs doublet models\, extra-dimensional scenarios\,
and models of compositeness. In this talk\, we derive a comprehensive set
of constraints on flavour violating Higgs couplings using data on meson o
scillations\, rare decays\, dipole moments and other precision observables
. While these low-energy constraints are very strong for processes involvi
ng only electrons\, muons or light quarks\, Higgs couplings to top quarks
and tau leptons can still be very large. In fact\, the strongest limits on
processes like t -> h q\, h -> tau mu and h -> tau e are already coming f
rom the LHC. We derive concrete bounds on h -> tau mu and h -> tau e by re
casting the ATLAS search for h -> tau tau\, and we demonstrate how a dedic
ated search for lepton flavour violating Higgs decays can achieve a substa
ntially improved sensitivity even with existing data alone.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2556
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Adam Martin on Supersoft SUSY at the LHC
DTSTART;VALUE=DATE-TIME:20130122T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2588@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will show how supersoft supersymmetry is super-
safe from LHC and flavor constraints.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2588
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dr. Alessandro Codello on On the General Form of
the Effective (Average) Action
DTSTART;VALUE=DATE-TIME:20130129T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2595@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will try to understand the general form of the
effective (average) action starting from a series of clues: the derivative
expansion\, the scale anomaly\, the conformal anomaly and the fact that R
G transformations can be compensated by rescalings of the metric. In d=2 w
e will find a form for the effective (average) action that leads straightf
orwardly to Zamolodchikov's c-function and to the quantization of two dime
nsional quantum gravity.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2595
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christian Bogner on Multiple polylogarithms and F
eynman integrals
DTSTART;VALUE=DATE-TIME:20130416T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2644@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Polylogarithms and their various generalizations can be seen a
s functions given by iterated integrals.\nThe first part of my talk is abo
ut a very general class of such iterated integrals\, called multiple polyl
ogarithms in several variables\, and the possible application of these fun
ctions in Feynman integral computations. In the second part I want to disc
uss a new result for the two-loop sunrise integral with arbitrary masses.\
nIt seems that this is a case where the classes of iterated integrals used
in particle physics so far (including the functions of the first part) ar
e not sufficient to express the result.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2644
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christian Bauer on The Event Generator GENEVA
DTSTART;VALUE=DATE-TIME:20130423T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2645@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2645
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Moritz McGarrie on Scattering in General Gauge Me
diation and Holography
DTSTART;VALUE=DATE-TIME:20130430T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2646@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Supersymmetry breaking and its mediation can be reformulated a
s a scattering problem.\nThis talk will outline how pion scattering and "
bottom up" AdS/QCD models may be extended to describe strongly coupled hi
dden sectors that break supersymmetry. We look at what can "in-principle"
be measured and what it can actually predict about the MSSM.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2646
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sven Krippendorf on Global Embedding of D-branes
at singularities
DTSTART;VALUE=DATE-TIME:20130507T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2647@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:If string theory describes the real world\, we need a low-ener
gy model arising from an explicit string compactification that is consiste
nt with our observations in particle physics and cosmology. In this talk I
shall present recent progress towards such a realistic model in the conte
xt of type IIB string theory with D-branes at singularities. In particular
\, I am interested in constructing models that allow for moduli stabilisat
ion and a realistic D-brane construction close to the Standard Model\, sat
isfying all known consistency conditions. The phenomenology of these D-bra
ne models is briefly discussed. This talk is based on the following papers
: 1206.5237\, 1304.0022\, 1304.2771.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2647
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jean-Francois Fortin on Scale Invariance and Conf
ormal Invariance
DTSTART;VALUE=DATE-TIME:20130513T170000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2648@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We investigate the theoretical implications of scale without c
onformal invariance in quantum field theory. We argue that RG flows of su
ch theories correspond to recurrent behaviors\, i.e. limit cycles or ergod
icity\, and show how dilatation generators do generate dilatations. We di
scuss the implications for the a-theorem\, and use Weyl consistency condit
ions to show that scale implies conformal invariance. Finally\, we clarif
y the necessary and sufficient conditions for conformality and present new
types of conformal field theories.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2648
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Simon Caron-Huot on When does the gluon Reggeize?
DTSTART;VALUE=DATE-TIME:20130528T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2649@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2649
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Oliver Dekkers on NNLO antenna subtraction for he
avy quark pair production
DTSTART;VALUE=DATE-TIME:20130702T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2650@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The calculation of differential cross sections and distributio
ns in perturbative QCD beyond the leading order requires methods to regula
rize and handle the infrared (IR) divergences that appear in the intermedi
ate steps of such computations. The antenna subtraction formalism provides
a solution to this problem. As a step towards the fully differential trea
tment of heavy quark pair production at next-to-next-to-leading order (NNL
O) in perturbative QCD at the Tevatron and the LHC\, I will discuss the co
nstruction of NNLO antenna subtraction terms for the production of a heavy
quark-antiquark pair by an uncolored initial state. Emphasis will be put
on the analytical computation of the corresponding integrated subtraction
terms. As an application and check of our results\, I will elaborate on t
he calculation of the inclusive heavy-quark pair production cross section
in e+e− annihilation at NNLO QCD.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2650
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Marco Serone on Composite Higgs Models and possib
le UV completions
DTSTART;VALUE=DATE-TIME:20130709T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2651@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We briefly review the main ideas that led to phenomenologicall
y viable models of new physics beyond the Standard Model (SM) where the Hi
ggs particle is supposed to be a pseudo Nambu Goldstone Boson (pNGB) boun
d state of some strongly interacting theory.\nA key ingredient in these co
nstructions is played by the concept of partial compositeness.\nHow to con
sistently get such models from an underlying UV theory is an important ope
n problem.\nWe will show how to construct UV completions of bottom-up mod
els with a pNGB composite Higgs and partial compositeness\, admitting a w
eakly coupled description of the composite sector. \nThis is identified as
the low energy description of an SO(N) supersymmetric gauge theory with m
atter fields in the fundamental of the group. The Higgs is identified with
certain components of matter fields in a Seiberg dual description of the
theory. \nThe SM gauge fields are obtained by gauging a subgroup of the gl
obal group. The mass mixing between elementary SM and composite fermion fi
elds advocated in partial compositeness arise from the flow in the IR of
certain trilinear Yukawa couplings defined in the UV theory. \nWe explic
itly construct two models of this kind.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2651
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Nicolas Greiner on Automation of one loop calcula
tions with GoSam
DTSTART;VALUE=DATE-TIME:20130618T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2653@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Reliable predictions for processes relevant at the LHC require
s at least the calculation of next-to-leading order QCD corrections. For m
ulti-particle final states this is a highly non-trivial task. Automating s
uch calculations drastically simplifies these computations.\nIn this talk
I will give an introduction to GoSam\, a public package that can be used f
or automated generation of one-loop amplitudes. Besides the description of
the package I will explain how it can be applied to relevant processes an
d present some results.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2653
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Stefan Liebler on Higgs production in the 2HDM an
d the MSSM
DTSTART;VALUE=DATE-TIME:20130604T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2655@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We focus on recent progress in the higher order calculation of
Higgs production cross sections induced by gluon fusion\, bottom-quark an
nihilation and Higgsstrahlung in the 2-Higgs-Doublet-Model and the minimal
supersymmetric standard model at a hadron collider.\nThe discussion short
ly includes the presentation of the computer code SusHi. Theory uncertaint
ies due to the enhancement of the bottom-quark Yukawa coupling within the
mentioned models are discussed.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2655
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Valery Yundin on High multiplicity QCD amplitudes
with NJet.
DTSTART;VALUE=DATE-TIME:20130625T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2656@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss methods relevant for accurate calculations of h
igh-multiplicity one-loop amplitudes and their implementation in the publi
cly available program NJet.\nNJet is a C++ library for the numerical evalu
ation of one-loop virtual corrections in QCD. A generalized unitarity redu
ction algorithm is used to construct arbitrary multiplicity fermion-gluon
primitive amplitudes. From these basic building blocks the one-loop contri
bution to the squared matrix element\, summed over colour and helicities\,
is calculated. While the primitive amplitudes are given for arbitrary mul
tiplicities we provide the squared matrix elements only for up to 7 extern
al partons allowing the evaluation of the five jet cross section at next-t
o-leading order accuracy.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2656
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lorenzo Tancredi on Towards two-loop QCD correcti
ons to vector boson pair production.
DTSTART;VALUE=DATE-TIME:20130521T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2659@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Vector boson pair production offers a wide spectrum of observa
bles which allow to test the theory of electroweak interaction\, to probe
the Higgs mechanism and to search for physics beyond the standard model. I
n this seminar I will focus on the progress made in the last years towards
the computation of two-loop corrections to the production of Z gamma\, W
gamma\, ZZ and WW at LHC.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2659
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Markus Rummel on Construction of Explicit de Sitt
er vacua in Type IIB Flux compactifications
DTSTART;VALUE=DATE-TIME:20130611T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2664@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:An explicit example for a de Sitter vacuum in type IIB string
theory will be presented. After deriving a sufficient condition for de Sit
ter vacua in the K"ahler uplifting scenario\, it is shown that a globally
consistent de Sitter model can be realized on a certain Calabi-Yau\, stabi
lizing all geometric moduli and fulfilling all known consistency constrain
ts. The complex structure moduli stabilization by fluxes is studied explic
itly for a small number of cycles. Extrapolating to a larger number of flu
x carrying cycles\, statistical studies in the literature are verified\, s
howing that in principle the string landscape can account for a universe w
ith an extremely small cosmological constant.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2664
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lucca Vecchi on The Natural Composite Higgs
DTSTART;VALUE=DATE-TIME:20130716T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2706@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:TBA
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2706
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Bauer on New physics in Higgs to gamma gam
ma
DTSTART;VALUE=DATE-TIME:20130628T123000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2707@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:TBA
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2707
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Piotr Pietrulewicz on Secondary mass effects in S
CET
DTSTART;VALUE=DATE-TIME:20131022T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2734@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present a method to determine secondary mass effects in jet
production using the formalism of soft-collinear effective theory (SCET).
The setup is based on the field theoretic treatment of collinear and soft
massive modes which have to be separated coherently from the collinear a
nd ultrasoft modes related to massless quarks and gluons. As a concrete
example we take the thrust distribution for e+ e- collisions in the dijet.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2734
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gautier Solard on AdS vacua in IIB vacua\, scale
separation and SU(2) torsion
DTSTART;VALUE=DATE-TIME:20131029T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2735@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk we study AdS_4 with N=1 supersymmetry in type IIB
supergravity. Using Generalised Geometry it is easy to see that the inter
nal manifold has to have SU(2) structure. We will then focus on coset and
group manifolds and we will look for examples allowing for scale separatio
n. We will also show that\, for constant warp factor\, it is not possible
to have sourceless solutions.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2735
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andrey Grozin on HQET: Heavy Heavy vertex diagram
with two velocities
DTSTART;VALUE=DATE-TIME:20131105T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2736@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The one-loop HQET heavy-heavy vertex diagram with arbitrary po
wers of all three denominators and arbitrary residual energies is investig
ated. This allows one to calculate this triangle diagram with arbitrary ra
diative corrections to all 3 propagators (2 heavy ones and 1 massless) (pr
ovided that there are no loops of finite-mass quarks). Various cases when
the result becomes simpler are considered.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2736
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Frank Siegert on NLO + parton shower matching and
merging in four-lepton + jets production
DTSTART;VALUE=DATE-TIME:20131112T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2737@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2737
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Maike Tormählen on Instantons on Special Geometr
ies
DTSTART;VALUE=DATE-TIME:20131126T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2738@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Instantons in higher-dimensional gauge theories appear\, for e
xample\, in the context of string compactification. The instanton conditio
n on the compact part of spacetime ensures supersymmetry preservation. My
aim is to better understand instantons on spe- cial holonomy manifolds. I
introduce higher-dimensional instantons and show how the instanton conditi
on can be rewritten as a set of differential equations and algebraic condi
- tions. These equations can be solved under certain simplifying assuption
s. The algebraic conditions can be interpreted as relations of a certain q
uiver gauge theory. I describe the construction of these quivers and show
that the instanton conditions match the quiver relations.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2738
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Baker on B Meson Decay Constants from QCD
Sum Rules
DTSTART;VALUE=DATE-TIME:20131203T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2739@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Due to the strong coupling of QCD at low scales\, some fundame
ntal QCD parameters cannot be measured directly in experiments. Conversel
y\, perturbative methods cannot be used to predict hadronic properties. T
hus\, non-perturbative methods must be used to provide a link between QCD
and experiment. I will outline the QCD sum rule method and present a rece
nt calculation of the B meson decay constants\, focusing on \\(f_{B_c}\\).
The calculation employs finite energy sum rules with Legendre polynomial
integration kernels along with a three-loop pseudoscalar two-point correl
ator\, lighter quark mass corrections and non-perturbative corrections up
to dimension six.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2739
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tobias Kasprzik on Vector-boson pair production a
t the LHC
DTSTART;VALUE=DATE-TIME:20131210T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2740@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Vector-boson pair production is of great phenomenological impo
rtance at the LHC. These processes not only constitute irreducible backgro
unds to SM Higgs production and various new physics signatures\, they may
also allow us to study the non-abelian structure of the SM at highest ener
gies and provide the opportunity to search for anomalous couplings. In thi
s talk we review the status of the corresponding theory predictions\, wher
e we focus on recent results on electroweak radiative corrections.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2740
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Leonardo di Giustino on Setting the Renormalizati
on Scale in QCD: The Principle of Maximum Conformality - PMC
DTSTART;VALUE=DATE-TIME:20131217T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2741@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss a new method for setting the renormalization sc
ale in QCD\, the PMC method\, and show its in progress applications.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2741
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Viraf Mehta on Phenomenological Constraints on Li
ght U(1)s in Heterotic String Models
DTSTART;VALUE=DATE-TIME:20131119T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2795@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Although additional low scale U(1)s have been discussed extens
ively in GUTs and string models\, having a viable light\, extra U(1) in wo
rldsheet heterotic string constructions has proven to be a challenge. Her
e\, we present the construction of heterotic string models using the free
fermionic formulation and focus on how viable U(1)s may arise. We motivat
e an example as an appealing proposition to explain the suppression of pro
ton decay mediating operators. This forbids the undesired operators\, and
thus they may only arise after the U(1) is broken. We give details of a
left-right symmetric model that may accommodate such a symmetry and consid
er constraints on such string-derived U(1)s focussing on those imposed by
gauge coupling unification and proton stability. In two contrasting cases
we show that the gauge data at the electroweak scale necessitate that the
Z' charges are embeddable in E6. We finally discuss how models with the re
quired properties may be constructed in the free fermionic formulation.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2795
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Joachim Brod on New strong interactions from t t-
bar asymmetries
DTSTART;VALUE=DATE-TIME:20140107T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2810@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The CDF and D0 experiments at Tevatron measure a top-quark for
ward-backwardasymmetry significantly larger than the standard-model predic
tion. We construct a model which involves new strong interactions at the
electroweak scale and can explain the measured asymmetry. Our model posses
ses a flavor symmetry which allows to evade flavor and collider constraint
s\, while it still permits flavor-violating couplings of order 1 which are
needed to generate the asymmetry via light t channel vectors.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2810
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Enrico Lunghi on Trilepton Signatures of Light Ch
arged and CP-odd Higgs Bosons in Top Quark Decays
DTSTART;VALUE=DATE-TIME:20140114T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2811@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In singlet extensions of the two Higgs doublet model\, a light
CP-odd Higgs boson (A) can significantly modify decay modes of the charge
d Higgs\, without necessarily affecting decay modes of the standard model-
like Higgs boson. These effects can be sizable even if the doublet compone
nt of the light CP-odd Higgs is small\, so that constraints from Upsilon d
ecays and direct CP-odd Higgs production do not apply. We study a scenario
in which the charged Higgs is produced in top quark decays\, t → H^±b\
, with dominant H^± → W^±A. We focus on the CP-odd Higgs mass range be
low the b ̄b threshold. We summarize all current experimental constraints
and find that\, as a result of H± → W^±A dominance\, this scenario is
not constrained in a large region of tanβ\, mH^±\, and CP-odd Higgs dou
blet component. We discuss search strategies based on A → τ^+τ^−\, w
ith both taus decaying leptonically\, and on the subleading decay mode A
→ μ^+μ^−. We show thatasearchfort→H^+b\, H^+ →W^+A\, A→μ^+ μ
^− in 20/fb of 8 TeV LHC data can constrain most of the currently allow
ed parameter space. Existing trilepton searches are not sensitive to this
signal due to the adopted isolation criteria.
LOCATION:Gernot-Gräff-Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2811
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andreas Scharf on Electroweak corrections to Z+2j
et production
DTSTART;VALUE=DATE-TIME:20140121T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2812@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The LHC is expected to probe\, and provide evidence for\, the
existence of new phenomena beyond the Standard Model (SM).\nHowever\, so f
ar the results from the LHC experiments do not indicate any deviation from
the SM and the search for such phenomena generates exceptional challenges
for theory and experiment. In particular we need a detailed understanding
of SM background processes which requires precise theoretical predictions
at next-toleading order (NLO).\nIn this talk I will introduce the generat
or RECOLA which allows the generation of one-loop matrixelements in the SM
.\nI will discuss several of its features and as an application I will exa
mine the NLO electroweak corrections to the production of Z+2jets at the L
HC.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2812
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Manuel Krämer on Applications of Quantum Cosmolo
gy
DTSTART;VALUE=DATE-TIME:20140128T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2813@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The unification of quantum theory and gravity is one of the mo
st crucial open problems in physics. It is necessary to have a theory of q
uantum gravity in order to consistently describe Nature and to resolve sin
gularities that are inherent in General Relativity. In order to decide whi
ch is the correct theory\, we need testable predictions.\nCosmological mod
els are the best candidates to look for potential observational effects be
cause of the high energies that are present in the very early universe. Fu
rthermore\, they also serve as a mathematically simpler tested to study co
nceptual questions of quantum gravity.\n\nOne of the most conservative app
roaches to quantum cosmology is a canonical quantization that leads to the
Wheeler-DeWitt equation. In this talk\, I will present how this approach
has been applied to study whether one can observe quantum-gravitational ef
fects in the Cosmic Microwave Background and to resolve singularities that
appear in classical cosmology. I will also compare these results with fin
dings from Loop Quantum Cosmology.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2813
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ben Pecjak on QCD for boosted top production at h
adron colliders
DTSTART;VALUE=DATE-TIME:20140204T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2814@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We discuss challenges and prospects for calculations of QCD co
rrections to boosted top production at hadron colliders.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2814
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Cen Zhang on Effective field theory approach to t
op-quark physics at NLO accuracy
DTSTART;VALUE=DATE-TIME:20140429T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2873@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Top quark processes potentially suffer from a large uncertaint
y at leading order in QCD. To search for new physics in top quark processe
s\, it is desirable to have a model-independent approach at the NLO accura
cy. Effective field theory provides a framework in which the radiative cor
rections to new interactions can be consistently included\, but the analys
is can be complicated due to operator mixing effects. I will discuss the e
ffective field theory approach to top-quark physics\, with a focus on NLO
calculation. In particular I will present its applications in precision el
ectroweak tests\, in top-quark decay processes and in top-quark FCNC produ
ction.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2873
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Einan Gardi on Progress on non-Abelian exponentia
tion and long distance singularities
DTSTART;VALUE=DATE-TIME:20140506T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2874@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will report on the on-going computation the soft anomalous d
imension in multi-leg gauge-theory scattering amplitudes at the three-loop
s order. I will also discuss the non-Abelian exponentiation theorem and it
s recent generalisation to multiple Wilson lines\, and illustrate how diag
rammatic exponentiation becomes useful in the course evaluating the soft a
nomalous dimension and understanding its analytic structure.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2874
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Roni Harnik on Fermion Hierarchy from Scalar Anar
chy
DTSTART;VALUE=DATE-TIME:20140617T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2876@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss ideas for generating fermion masses from loops
of heavy superpartners. In high-scale supersymmetry\, what used to be the
flavor problem can become a feature\, helpful in giving mass to the lighte
r generations.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2876
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Felix Yu on Anatomizing Exotic Production of the
Higgs Boson
DTSTART;VALUE=DATE-TIME:20140624T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2877@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We discuss exotic production modes of the Higgs boson and how
their phenomenology can be probed in current Higgs analyses. We highlight
the importance of differential distributions in disentangling standard pr
oduction mechanisms from exotic modes. We present two model benchmarks fo
r exotic Higgs production arising from chargino-neutralino production and
study their impact on the current Higgs dataset. As a corollary\, we emph
asize that current Higgs coupling fits do not fully explore the space of n
ew physics deviations possible in Higgs data.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2877
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lian Tao-Wang on Dark matter at colliders
DTSTART;VALUE=DATE-TIME:20140701T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2878@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:MITP seminarraum: Staudinger Weg 9\, 02 430/432
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2878
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anna Kaminska / James Barnard on Composite Higgs
models
DTSTART;VALUE=DATE-TIME:20140708T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2879@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Seminarraum MITP\, Staudingerweg 9\, Raum 02-430/432
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2879
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lian Tao Wang (discussion leader) on Discussion s
ession: Physics at a 100 TeV collider
DTSTART;VALUE=DATE-TIME:20140715T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2880@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Physics opportunities and prospects at a 100 TeV proton-proton
will be informally discussed.
LOCATION:Seminarraum MITP\, Staudingerweg 9\, Raum 02-430/432
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2880
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Junji Hisano on Probing the TeV scale and beyond
with EDMs
DTSTART;VALUE=DATE-TIME:20140722T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2881@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Electric Dipole Moments (EDMs) are sensitive to CP violation i
n physics beyond the standard model\, which might not be accessible at th
e LHC. In this talk I review the current status of the experiments and als
o predictions in models beyond the standard model.
LOCATION:Seminarraum MITP\, Staudingerweg 9\, Raum 02-430/432
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2881
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alberto Mariotti on Gauge Mediation of Exact Scal
e Breaking
DTSTART;VALUE=DATE-TIME:20140527T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2882@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will first review basic aspects of extensions of the Standar
d Model where UV scale invariance aim to protect the Higgs mass from quant
um corrections.\nI will then present a gauge mediation principle for BSM t
heories where exact UV scale invariance is broken in a hidden sector:\nthe
relevant configurations are those in which the Standard Model and a hidde
n sector emanate from a scale invariant pair of UV theories that communica
te only via gauge interactions. I will show that in such configurations\,
once scale invariance is broken in the hidden sector\, relevant operators
are generated in the Higgs potential\, leading to electroweak symmetry br
eaking. \nThe resulting Higgs potential differs from the Standard Model an
d contains logarithmic mass-squared terms which can lead to unusual Higgs
self-couplings.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2882
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andrea Thamm on Heavy Vector Triplets: Bridging T
heory and Data
DTSTART;VALUE=DATE-TIME:20140603T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2908@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss a model-independent strategy to study narrow re
sonances applied to a heavy vector triplet of the Standard Model group for
illustration. The method is based on a simplified phenomenological Lagran
gian which reproduces a large class of explicit models. Firstly\, this all
ows us to derive robust model-independent phenomenological features and to
identify the peculiarities of different explicit realizations. Secondly\,
limits on cross section times branching ratios can be converted into boun
ds on a few relevant parameters in a fully analytic way\, allowing for an
interpretation in any given explicit model. Based on the available 8 TeV L
HC analyses\, we derive current limits and interpret them for vector tripl
ets arising in weakly coupled (gauge) and strongly coupled (composite) ext
ensions of the SM. We point out that a model-independent limit setting pro
cedure must be based on purely on-shell quantities. Finite width effects a
ltering the limits can be considerably reduced by focusing on the on-shell
signal region.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2908
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jamie Tattersall on CheckMATE: Confronting your F
avourite New Physics Model with LHC Data
DTSTART;VALUE=DATE-TIME:20140610T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2924@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the first three years of running\, the LHC has delivered a
wealth of new data that is now being analysed. With over 20 fb−1 of inte
grated luminosity\, both ATLAS and CMS have performed many searches for ne
w physics that theorists are eager to test their model against. However\,
tuning the detector simulations\, understanding the particular analysis de
tails and interpreting the results can be a tedious task.\nWe present Chec
kMATE (Check Models At Terascale Energies) as a tool for theorists to help
with these problems. The program accepts simulated events in many formats
for any model that a theorist can invent. The program then determines whe
ther the model is excluded or not at 95% CLs by comparing to many recent e
xperimental analyses. Furthermore the program can calculate confidence lim
its and provide detailed information about signal regions of interest. It
is simple to use and the program structure allows for easy extensions to u
pcoming LHC results in the future.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2924
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Florian Staub on Exploring models beyond the MSSM
with public computer tools
DTSTART;VALUE=DATE-TIME:20140520T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:2925@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will briefly introduce the B-L-SSM and show how the phenomen
ology of this model was studied using public computer tools. For this purp
ose the model was implemented in the package SARAH and a new SPheno module
for a precise mass spectrum calculation based on a constrained GUT thoery
was obtained. SPHeno was also linked to HiggsBounds to check the current
constraints from Higgs searches and to MicrOmegas to study the properties
of the new dark matter candidates in this model. The impact of kinetic mix
ing on Z-prime searches at the LHc was pointed our using WHIZARD. Finally\
, the stability of R-parity in this model was checked with Vevacious. I wi
ll comment on the possibility to use the SUSY-Toolbox scripts to perform s
imilar studies for a wide range of models beyond the SM and MSSM based on
a single implementation of the model in SARAH.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/2925
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Irene Valenzuela on The Inflaton as an MSSM Higgs
boson in String Theory
DTSTART;VALUE=DATE-TIME:20141028T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3011@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We propose to identify the inflaton with a heavy MSSM Higgs bo
son\, such that BICEP2 results (if confirmed) could be an indication of SU
SY breaking at such a large scale. We have built some toy models in which
the Higgs boson/inflaton is the position modulus of a system of D7 branes
at singularities in Type IIB orientifold compactifications. A scalar poten
tial is generated for the inflaton from the DBI+CS action once closed stri
ng fluxes are introduced\, and the transplanckian field range is achieved
in a way similar to F-term axion monodromy inflation.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3011
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Johannes Broedel on The Drinfeld associator: recu
rsive calculation of open-string amplitudes
DTSTART;VALUE=DATE-TIME:20141104T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3012@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Employing the Drinfeld associator\, open string tree amplitude
s can be calculated for any multiplicity and to any order in the inverse s
tring tension. After describing the method and its mathematical background
\, I will comment on the applicability to other field and string theories.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3012
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Bithika Jain on Models with small cosmological co
nstant at finite temperature
DTSTART;VALUE=DATE-TIME:20141118T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3013@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In 5D holographic realizations of spontaneously broken approxi
mate conformal invariance\, a naturally light dilaton can be obtained via
the introduction of the small dependence of the 5D scalar potential on the
field itself. The resulting 4D effective cosmological constant is also su
ppressed. In this talk I will discuss the finite temperature behaviour of
such models using holography\, with envisioned application to cosmological
phase transitions during which the effective 4D cosmological constant is
expected to change. This is realised by studying classical solutions to th
e 5D scalar and Einstein field equations that have a regular horizon\, in
the presence of non-trivial scalar field vacuum expectation value. I shal
l then discuss how the results we find are distinct from the Randall Sundr
um phase transitions with Goldberger-Wise stabilization.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3013
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Holthausen on Flavour Symmetries: From Neu
trino Mass Models to Higgs LFVs
DTSTART;VALUE=DATE-TIME:20141125T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3014@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will review the use of (mostly) discrete flavour symmetries
to describe fermion mixing. The impact of the (relatively recent) measurem
ent of a large reactor mixing angle on model building is discussed in a mo
del-independent way\, and a novel VEV alignment mechanism is presented. Th
is allows to build models that may be directly testable at the LHC\, for e
xample. The question if the recent CMS excess in the channel h -> mu tau c
an be explained in such a model will be answered.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3014
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fady Bishara on Dark matter and flavor
DTSTART;VALUE=DATE-TIME:20141202T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3015@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We show that flavor symmetries can lead to dark matter stabili
ty without the need to impose additional discrete or continuous symmetries
specifically for this purpose. We explore two scenarios. In the first\, t
he metastability of asymmetric dark matter (ADM) derives from the breaking
of continuous flavor symmetries. We show that\, for ADM that carries nonz
ero baryon number\, the continuous flavor symmetries that generate the fla
vor structure in the quark sector also imply a looser lower bound on the m
ass scale of the asymmetric mediators between the dark and visible sectors
. We show that the mediators for B = 2 ADM can be of O(TeV) and can thus b
e searched for at the LHC. In the second scenario we show that flavor tria
lity protects dark matter from decay even with non-MFV flavor breaking. We
show that there is a viable region in parameter space where we obtain the
correct thermal relic density while satisfying bounds from direct searche
s for the mediators at the LHC and low energy flavor observables.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3015
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Erik Panzer on Linearly reducible Feynman integra
ls
DTSTART;VALUE=DATE-TIME:20141209T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3016@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In some cases\, the representation of Feynman integrals in Sch
winger parameters is simple enough such that it can be integrated directly
in terms of multiple polylogarithms with available programs. I will summa
rize classes of graphs which belong to this class and explain the related
criterion. Then I will sketch how specially adapted parametrizations exten
d this method\, in a very efficient way\, to infinite classes of 3- and 4-
point functions.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3016
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Daniel Stolarski on Emerging Jets
DTSTART;VALUE=DATE-TIME:20141216T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3017@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will describe a new collider object we have termed emerging
jets.\nThese can arise when there is a confining dark sector connected to
the Standard Model by a TeV scale mediator\, a scenario that is well motiv
ated by dark matter considerations. The signature of an emerging jet is O(
10) displaced vertices inside the jet each with different impact parameter
\, and a small number of prompt tracks. I will describe strategies that ca
n be used to discover emerging jets even if they have very small cross sec
tions.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3017
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Satyanarayan Mukhopadhyay on A gauge singlet ferm
ion as dark matter
DTSTART;VALUE=DATE-TIME:20141111T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3018@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Dark matter relics could have been generated through thermal f
reeze-out (WIMP)\, or through the generation of an early universe particle
-antiparticle asymmetry (ADM). If we have a light WIMP\, with light “med
iators” helping maintain thermal equilibrium with the SM sector\, they s
hould show up in various ongoing searches. Is there a convincing hint so f
ar? If only the DM field is present in the relevant energy scales\, how hi
gh can the scale of effective WIMP-SM contact interactions be\, and how fa
r can the next generation experiments probe? If we have an ADM instead\, i
s there a generic prediction that can distinguish an ADM from a WIMP? I sh
all discuss these three questions in the context of a fermionic dark matte
r candidate singlet under the standard model gauge group\, taking examples
from SUSY\, effective interactions and composite models.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3018
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thomas Lübbert on NNLL qT resummation and beyond
DTSTART;VALUE=DATE-TIME:20150203T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3041@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:qT spectra of vector bosons at hadron colliders provide import
ant tests of the Standard Model. In the crucial region\, where the boson i
nvariant mass M is much smaller than its transverse momentum qT\, the spec
tra are very sensitive to initial state radiation. Applying soft-collinear
effective theory\, we discuss a universal framework for its description a
nd determine the relevant perturbative operators up to next-to-next-to lea
ding order (NNLO). \n\nFor any heavy color neutral final state\, these res
ults enable us to resum logarithms of qT/M up to next-to-next-to leading l
ogarithmic (NNLL) accuracy and to consistently match to a fixed order calc
ulation. For a selection of processes this is implemented in the program C
uTe. As an important example\, we determine the qT spectrum of Drell-Yan p
roduction to NNLO+NNLL accuracy and confront these results with LHC data.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3041
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sophia Borowka on Two-loop computations with SecD
ec and their application within the MSSM
DTSTART;VALUE=DATE-TIME:20150127T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3042@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Among the many theoretical models employing the Brout-Englert-
Higgs mechanism to account for electroweak symmetry breaking\, the Standar
d Model and the Minimal Supersymmetric Standard Model are the most popular
ones. The discovered particle at the LHC can be interpreted as one of the
Higgs-bosons within the MSSM. To improve on a more precise prediction\, r
esults for the momentum dependent two-loop contributions of O(alpha_t alph
a_s) to the masses in the Higgs sector of the MSSM are presented. They are
obtained in a Feynman-diagrammatic approach\, where the program SecDec is
used for the numerical computation of the analytically unavailable massiv
e two-loop diagrams. The main features of the program SecDec are introduce
d and the method of sector decomposition is explained. Several application
s highlighting its features are shown. Then\, the renormalization of the m
omentum dependent two-loop self-energies is discussed and the resulting sh
ifts in the CP-even Higgs-boson masses are shown.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3042
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: David Marsh on Galaxy cluster X-rays as a window
to the dark sector
DTSTART;VALUE=DATE-TIME:20150120T130000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3044@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Axion-like particles (ALPs) can convert into photons in the pr
esence of coherent background magnetic fields. Galaxy clusters are the lar
gest gravitationally bound objects in the universe and support magnetic fi
elds that are coherent over kiloparsec (3*10^19 m) scales. In this talk\,
I will discuss how the conversion of ALPs into X-ray photons in clusters o
f galaxies provide a window to the dark sector\, and in particular how the
different observations (null and otherwise) of an X-ray line at 3.5 keV f
rom galaxies and clusters are consistent with a scenario in which dark mat
ter decays into ALPs that subsequently convert into photons in astrophysic
al magnetic fields. Furthermore\, I will mention how a background of relat
ivistic ALPs is a generic outcome in known classes of stabilised string co
mpactifications\, and how such “dark radiation”\, if present\, may exp
lain the longstanding question of the nature of the soft X-ray excess in c
lusters of galaxies.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3044
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ennio Salvioni on Phenomenology of Induced Electr
oweak Symmetry Breaking
DTSTART;VALUE=DATE-TIME:20141106T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3055@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We study the phenomenology of models of electroweak symmetry b
reaking where the Higgs potential is dominated by a positive quadratic ter
m destabilized by a tadpole. The tadpole arises from the coupling to an ``
auxiliary' Higgs sector\, which can be either perturbative or strongly cou
pled.\nThese models can explain the 125 GeV Higgs mass in supersymmetry wi
thout fine-tuning\, and predict a rich Higgs physics beyond the standard m
odel.\nWe analyze the constraints set by the 8 TeV run of the LHC\, and gi
ve projections for the sensitivity of the upcoming 14 TeV run.\nWe find th
at a significant parameter space for such models is currently open\, allow
ing values of the Higgs cubic coupling down to 0.4 times the Standard Mode
l value.\nThe 14 TeV LHC run will stringently test this scenario\, and we
identify several new searches with discovery potential.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3055
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Susanne Westhoff on Top-Quarks at 100 TeV
DTSTART;VALUE=DATE-TIME:20141215T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3059@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The international effort to build a proton-proton collider at
very high energies is driven by two perspectives. We seek to search energy
scales beyond the LHC reach for new physics\; and we want to explore the
electroweak standard model in its unbroken phase. In particular\, the heav
iest particle of the standard model\, the top-quark\, appears ultimately m
assless in processes at very high energies. Focusing on the novel class of
top-quark initiated processes at a 100-TeV collider\, I will discuss whet
her the top-quark can be treated as a parton inside the proton. Accordingl
y\, I will propose ways to treat the collinear enhancement from top-quarks
emitted along the beam line.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3059
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andrey Grozin on Three-loop cusp anomalous dimens
ion in QCD
DTSTART;VALUE=DATE-TIME:20150106T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3094@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Wilson line with a cusp describes interaction of a heavy quark
which changes its velocity with soft gluons\; it appears in many QCD prob
lems. We have calculated the cusp anomalous dimension with 3-loop accuracy
as a function of the angle. Some interesting limiting cases are considere
d.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3094
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tevong You on The Effective Standard Model: A Com
prehensive Approach to Decoupled New Physics
DTSTART;VALUE=DATE-TIME:20150113T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3095@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The main lesson learned from Run I of the LHC is that new phys
ics beyond the Standard Model (SM) is either hidden within the kinematic r
each of the LHC or decoupled at higher energies. Furthermore the Higgs bos
on has finally been discovered and seems to be SM-like to a first approxim
ation. Motivated by these two facts\, we consider a systematic approach to
decoupled new physics in the electroweak and Higgs sector by constraining
a complete set of dimension-6 operators that parametrise the leading effe
cts of the SM effective field theory. Lower limits are placed on the energ
y scale at which new degrees of freedom may enter into electroweak precisi
on tests at LEP as well as triple-gauge-couplings at the LHC and Higgs phy
sics at the Tevatron and LHC. Such a model-independent approach highlights
the complementary between different measurements and experiments.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3095
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Yang Zhang on Elliptic functions and Maximal Unit
arity
DTSTART;VALUE=DATE-TIME:20150129T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3098@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Scattering amplitudes at loop level can be reduced to a basis
of linearly independent Feynman integrals. The integral coefficients are e
xtracted from generalized unitarity cuts which define algebraic varieties.
We analyze a class of integrals whose maximal cuts give rise to an ellipt
ic curve. We derive unique projectors for all master integrals in terms of
multivariate residues along with Weierstrass' elliptic functions. We also
show how to generate the leading-topology part of the integration-by-part
s identities analytically from exact meromorphic differential forms on a t
orus.
LOCATION:Sozialraum der WA THEP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3098
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dario Buttazzo on Searching for the Higgs bosons
of a most natural NMSSM
DTSTART;VALUE=DATE-TIME:20150210T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3126@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the motivated hypothesis that the Higgs bosons of the next-
to-minimal supersymmetric Standard Model (NMSSM) be the lightest new parti
cles around\, we outline a possible overall strategy to search for signs o
f the extra CP-even states.\nIn a generic NMSSM which minimises the fine-t
uning of the electroweak scale\, we show how the measurements of the coupl
ings of the 126 GeV Higgs boson constrain the region of the physical param
eters.\nThen\, after determining the cross section for the production of t
he CP-even scalars and their most relevant branching ratios\, we analyse t
he current bounds and the foreseen reaches of direct searches for these st
ates at the LHC.
LOCATION:MITP Seminar Raum\, Staudinger Weg 9\, 02-430
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3126
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Vladimir Mitev on Exact result in 4D N=2 Gauge th
eories and integrability
DTSTART;VALUE=DATE-TIME:20150616T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3137@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We consider four dimensional N=2 superconformal quiver gauge t
heories obtained as orbifolds of maximally supersymmetric (N=4) Super-Yang
Mills and review several methods used to obtain exact results such as loc
alization\, tt* equations and integrability. In particular\, we investigat
e a conjecture stating that the anomalous dimensions of operators in the
purely gluonic sector of any planar conformal N=2 theory can be read off f
rom the N=4 SYM results by replacing the N=4 coupling constant by an inter
polating function of the N=2 coupling constants.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3137
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Brenda Penante on Non-planar on-shell diagrams in
N=4 Super Yang-Mills
DTSTART;VALUE=DATE-TIME:20150630T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3138@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Among the many recent developments in the study of scattering
amplitudes in maximally supersymmetric Yang-Mills theory is its dual formu
lation in terms of an integral over the Grassmannian Gr(k\,n) -- the space
of k-planes in n dimensions. This formulation is tied to the concept of o
n-shell diagrams\, bipartite graphs which beautifully relate field theory
with combinatorics and graph theory.\nThe planar limit of the theory (SU(N
) gauge group with N large) is well understood\, but the effects of having
a finite N are only starting to be explored. In this talk I will review t
hese concepts in the planar limit and present some new features that arise
when going beyond to non-planar on-shell diagrams.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3138
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Hagen Triendl on AdS Moduli Spaces
DTSTART;VALUE=DATE-TIME:20150714T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3139@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss moduli spaces of supersymmetric AdS vacua in va
rious dimensions. I will show how supersymmetry dictates certain geometric
structures on these moduli space. In cases with enough supersymmetry\, th
e moduli space can even be fixed completely. This gives strong implication
s for the large-N behavior of dual superconformal field theories. In parti
cular\, the conformal manifold and the sphere partition function of four-d
imensional N=2 SCFTs can be determined in the large-N limit.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3139
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Brian Batell on Neutrino Masses From Neutral Top
Partners
DTSTART;VALUE=DATE-TIME:20150519T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3160@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present theories of ‘Natural Neutrinos’ in which neutra
l fermionic top partner fields are simul- taneously the right-handed neutr
inos (RHN)\, linking seemingly disparate aspects of the Standard Model str
ucture: a) The RHN top partners are responsible for the observed small neu
trino masses\, b) They help ameliorate the tuning in the weak scale and ad
dress the little hierarchy problem\, and c) The factor of 3 arising from N
c in the top-loop Higgs mass corrections is countered by a factor 3 from t
he number of vector-like generations of RHN. The RHN top partners may aris
e in pseudo- Nambu-Goldstone-Boson (pNGB) Higgs models such as the Twin Hi
ggs\, as well as more general Composite\, Little\, and Orbifold Higgs scen
arios\, and three simple example models are presented. This framework firm
ly predicts a TeV-scale seesaw\, as the RHN masses are bounded to be below
the TeV scale by naturalness. The generation of light neutrino masses rel
ies on a collective breaking of lepton number\, allowing for comparatively
large neutrino Yukawa couplings and a rich associated phenomenology. The
structure of the neutrino mass mechanism realizes in certain limits the In
verse or Linear classes of seesaw. Natural Neutrino models are testable at
a variety of current and future experiments\, particularly in tests of le
pton universality\, searches for lepton flavor violation\, and precision e
lectroweak and Higgs coupling measurements possible at high energy e+e−
and hadron colliders.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3160
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Spinrath on Natural GUT scale mass ratios
DTSTART;VALUE=DATE-TIME:20150421T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3161@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In my talk I will focus on two different kind of masses and di
scuss their naturalness. First\, I will discuss ratios of fermion masses l
ike the tau and the bottom mass at the SUSY GUT scale. These ratios are pr
edicted in minimal GUT setups\, but recent data hints that nature has chos
en a more complicated setup. I will present alternatives and also show tha
t these alternatives can be used to generate a sizeable theta_13 in the ne
utrino sector. Then I will focus on the little hierarchy problem and discu
ss naturalness in the MSSM. It turns out that even after the Higgs discove
ry there are still regions with an acceptable amount of fine-tuning allowe
d assuming non-universal gaugino masses at the GUT scale.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3161
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jonas Lindert on Automated NLO QCD+EW corrections
for the LHC
DTSTART;VALUE=DATE-TIME:20150428T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3162@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Run-II of the LHC will probe the Standard Model of particle ph
ysics at unprecedented energies and precision. At such large energy scales
higher-order electroweak (EW) corrections are strongly enhanced due to th
e presence of large Sudakov logarithms. Their inclusion in the experimenta
l analyses will significantly enhance the sensitivity for new phenomena. I
n my talk I will present a fully automated implementation of next-to-leadi
ng order (NLO) EW corrections in the OpenLoops matrix-element generator co
mbined with the Sherpa and MUNICH Monte Carlo frameworks. The process-inde
pendent character of the implemented algorithms opens the door to NLO QCD+
EW simulations for a vast range of Standard Model processes\, up to high p
article multiplicity. As a first application\, I will present NLO QCD+EW p
redictions for vector boson production in association with up to three jet
s.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3162
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Francesco Riva on BSM Primary Effects
DTSTART;VALUE=DATE-TIME:20150602T010000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3163@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The phenomenological implications of the Standard Model (SM) a
re governed by the accidental symmetry structure of the dimension-4 Lagran
gian. In this talk I discuss the next order in an expansion in the Higgs f
ield and in derivatives\, that parametrize the largest effects of heavy ph
ysics beyond the SM\, in a bottom-up approach. The remaining symmetries of
this dimension-6 Lagrangian imply relations between experimental observab
les that should be used to test the consistency of deviations from the SM\
, to design new physics searches and to make them more sensitive.
LOCATION:THEP Sozialraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3163
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pier Francesco Monni on Generalised resummation f
or jet observables
DTSTART;VALUE=DATE-TIME:20150609T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3165@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss the features of Sudakov resummation for a wide
category of jet observables\, and I will devise a computational approach w
hich does not require the existence of a factorisation theorem for the cro
ss section in the logarithmic regime. I will discuss some applications as
well as comment on possible future developments.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3165
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Marco Nardecchia on New Physics and Anomalies in
B-meson decays
DTSTART;VALUE=DATE-TIME:20150706T160000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3166@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will review the status of flavor physics after
the first run of the LHC and in particular I will discuss recent results f
rom the LHCb experiment suggesting possible deviations from the SM predict
ions in semileptonic B-meson decays. I will discuss possible interpretatio
ns of these anomalies in terms of New Physics.
LOCATION:MITP
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3166
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Felix Kahlhoefer on Searching for dark mediators
DTSTART;VALUE=DATE-TIME:20150512T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3167@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss dark matter models\, which in addition to a new
stable particle introduce a new mediator with a mass comparable to or eve
n below the dark matter mass. The crucial observation is that such a media
tor will also induce new interactions between SM states\, thus leading to
a wide range of interesting signatures. For GeV-scale mediators\, strong c
onstraints arise from flavour physics and searches for rare constraints an
d I will consider the resulting dark matter phenomenology in the context o
f light pseudoscalars. The LHC\, on the other hand\, can achieve a unique
sensitivity for TeV-scale mediators by combining searches for monojets and
for dijet resonances. I will illustrate the remarkable complementarity of
different dark matter probes using the example of an axial-vector mediato
r.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3167
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexandr Azatov on Warped dipoles completed
DTSTART;VALUE=DATE-TIME:20150526T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3168@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss the computation of the dipole moments in the co
ntext of the warped extra-dimensional model. I will review the previous st
udies and then present the new study which takes into account previously i
gnored effects coming from the UV physics (tower of the KK Higgs modes). T
hese effects turn out to be important contradictory to the naive expectati
ons even in the brane Higgs limit.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3168
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Patipan Uttayarat on Non-standard Light Yukawas a
nd Higgs Portal
DTSTART;VALUE=DATE-TIME:20150623T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3169@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will discuss the size of deviations of the ligh
t quark Yuwakas in various NP scenario and their implication on dark matte
r phenomenology. I will also discuss how dark matter\, if it is discovere
d\, could be used as a probe for the light quark Yukawas.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3169
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Marius Wiesemann on Automation of transverse mome
ntum resummation at NNLO+NNLL and its application to ZZ and WW pairs
DTSTART;VALUE=DATE-TIME:20150721T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3191@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A general method for the transverse momentum resummation of a
system of colorless final states at the NNLO+NNLL is presented. Its automa
tion is implemented in the MATRIX framework. The results are fully-differe
ntial in the degrees of freedom of the final state system and its decays p
roducts. Upon the recent success of NNLO computations through p_T-subtract
ion for diboson production\, we present the transverse momentum resummatio
n for ZZ and WW production as a first application.
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3191
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thomas Flacke on Vector-like quarks from composit
e Higgs models: Collider search strategies and aspects of flavor
DTSTART;VALUE=DATE-TIME:20150625T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3224@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Composite Higgs models provide a viable solution to the hierar
chy problem. The masses for quarks are typically realized via linear mixin
g of the chiral elementary quarks with TeV scale vector-like fermion reson
ances from the strongly coupled sector. These resonances can be searched f
or at the LHC\, and we present results on several new search strategies fo
r heavy vector-like quark partners which can be applied at the early stage
s of the LHC run-II.\nThe mixing of elementary quarks with vector-like qua
rk partners induces the couplings tested in direct production and decays o
f quark partners\, but it can also induce large flavor violation\, such th
at additional assumptions on the flavor structure of the model are require
d. In the second part of the talk we present first results on a new attemp
t to avoid the flavor problem\, in which only a composite partner of the t
op quark is present at low energies.\n\nBased on: arXiv:1409.0409\, 1410.8
131\, 1501.03818\, 1501.07456\, \, and work in progress.
LOCATION:THEP Sozialraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3224
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: James D. Bjorken on TBA
DTSTART;VALUE=DATE-TIME:20150602T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3225@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Lorentzraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3225
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Taushif Ahmed on Threshold Cross Sections of Drel
l-Yan and Higgs at N^3LO QCD
DTSTART;VALUE=DATE-TIME:20150701T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3232@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Precise theoretical predictions for Drell-Yan (DY) production
of a pair of leptons and for the Higgs boson production at NNLO in pQCD pl
ay an important role in testing the Standard Model. The recent computation
of the full threshold contribution to the production of the Higgs boson t
hrough gluon fusion at N^3LO by Anastasiou. et. al contains valuable infor
mation about the soft gluons resulting from virtual and real emission part
onic subprocesses. In this talk\, we will discuss how this information alo
ng with the factorization property of QCD amplitudes\, renormalization gro
up invariance and Sudakov resummation of form factors can be utilized to o
btain the corresponding soft gluon contributions to DY production. This en
ables us to compute the full delta contribution\, which was missing in the
literature\, and hereby give predictions of the DY cross section at thres
hold N^3LO at the LHC. On the same direction\, we will see the production
cross section of the Higgs boson through \\(b {\\bar b}\\) annihilation ca
n also be computed at this accuracy. In addition\, this elegant formalism
can also be extended to compute the rapidity distributions in the DY and H
iggs boson productions at N^3LO QCD.
LOCATION:Minkowski Raum (Bau 2/412\, 05-119)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3232
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Till Martini on The Matrix Element Method at next
-to-leading order accuracy
DTSTART;VALUE=DATE-TIME:20151222T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3265@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Matrix Element Method (MEM) has proven beneficial to make
maximal use of the information available in experimental data. However\, s
o far it has mostly been used in Born approximation only. In this paper we
discuss an extension to NLO accuracy. As a prerequisite we present an eff
icient method to calculate event weights for jet events at NLO accuracy. A
s illustration and proof of concept we apply the method to the extraction
of the top-quark mass in e+e- annihilation. We observe significant differe
nces when moving from LO to NLO which may be relevant for the interpretati
on of top-quark mass measurements at hadron colliders relying on the MEM.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3265
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Emmanuel Stamou on Higgs couplings to quarks and
leptons: opportunities at the LHC
DTSTART;VALUE=DATE-TIME:20151110T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3266@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Higgs couplings to fermions are known parameters within th
e Standard Model. Deviations from these expectations would be clear signa
ls of new physics and are thus important target measurements for the LHC
program. \nSuch measurements are being performed both for the quark and th
e lepton sector. For the quark sector I discuss ways to extract informati
on about the coupling of the Higgs boson to the charm quark with emphasis
on methods applicable with the available LHC data set. For the lepton se
ctor I discuss whether it is at all possible within the MSSM to account f
or a possible observation of Lepton-Flavour-Violating Higgs decays at the
LHC.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3266
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Giovanni Grilli di Cortona on Probing dark matter
above TeV and below meV
DTSTART;VALUE=DATE-TIME:20151020T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3267@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss the mass reach for electroweakinos at future ha
dron colliders in several split SUSY scenarios and I will show that collid
er searches and direct detection experiments have the potential to cover l
arge part of the parameter space. I will then review the zero and finite t
emperature properties of the QCD axion: despite non-perturbative QCD\, axi
on properties can be extracted at the percent level partially exploiting t
he foreseen experimental accuracy in case of discovery.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3267
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Miguel Montero on Large-field inflation\, axions\
, and the weak gravity conjecture
DTSTART;VALUE=DATE-TIME:20151103T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3268@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Last year\, the BICEP2 collaboration announced the discovery o
f a significant scalar-to-tensor ratio r from CMB polarization measurement
s. Such a large value of r is related to a transplanckian field range for
the inflaton in many models. Although the results were later shown to be m
ostly dust\, this sparkled a lot of interest in obtaining models with tran
splanckian field ranges consistent with quantum gravity. It is notably dif
ficult to do so in string theory\, and for axion inflaton fields it has be
en argued that this difficulty is fundamental\, coming from the so-called
Weak Gravity Conjecture. The WGC demands the existence of instantons of sm
all action which couple to the axion and make the effective range subplanc
kian. Although the WGC only applies to a complete theory of gravity\, one
can build and study similar instantons in an effective theory. We discuss
quantum gravitational effects in Einstein theory coupled to axion scalars
to analyze the viability of several proposals to achieve superplanckian ax
ion periods. These effects generically spoil transplanckian field ranges i
n several popular models\, like the Kim-Nilles-Peloso model. Finally we di
scuss the realization of these instantons as euclidean D-branes in string
compactifications.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3268
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Benjamin Safdi on Evidence for a novel population
of gamma-ray point sources in the Inner Galaxy
DTSTART;VALUE=DATE-TIME:20160112T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3269@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will present a new method to characterize unresolved astroph
ysical point sources (PSs)\, generalizing traditional template fits to acc
ount for non-Poissonian photon statistics. I will apply this method to Fer
mi gamma-ray data to characterize PS populations in the Inner Galaxy. I wi
ll show that in the energy range ~1.9 to ~11.9 GeV and within 10 degrees o
f the Galactic Center with |b| > 2 degrees\, ~5-10% of the flux can be acc
ounted for by a population of unresolved PSs\, distributed consistently wi
th the observed ~GeV gamma-ray excess in this region. The excess is fully
absorbed by such a population\, in preference to dark-matter annihilation.
The inferred source population is dominated by near-threshold sources\, w
hich may be detectable in future searches. I will comment on ongoing work
to identify members of this new source population using gamma ray data alo
ng with input from other wavelengths.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3269
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Bernhard Mistlberger on Precise predictions for i
nclusive Higgs production at the LHC
DTSTART;VALUE=DATE-TIME:20151117T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3271@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The recent computation of QCD corrections at N3LO to Higgs bos
on production via gluon fusion has led to a significant reduction of scale
variation uncertainties of the inclusive production cross section.\nI pre
sent the updated predictions and discuss their phenomenological implicatio
ns.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3271
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Peter Schichtel on Dirty your hands: How to do ph
enomenology at a QCD machine
DTSTART;VALUE=DATE-TIME:20160126T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3272@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:By discovering the Higgs the LHC has already shaped a new era
in high energy particle physics. In this talk we follow the question of ho
w to do phenomenology at a hadron collider. First we develop an intuitive
picture of the physical processes which govern each collision. Then we sho
w how this knowledge can be used to forge dedicated computer programs\, th
e so called Monte Carlo event generators\, which simulate these collisions
in great detail. In the third part of this talk we then demonstrate how m
astering the QCD processes at the LHC can help us to gain deeper insight i
n the underlying physics\, which in the end we are all interested in.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3272
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Elisabetta Furlan on High precision determination
of the gluon fusion Higgs cross-section at the LHC
DTSTART;VALUE=DATE-TIME:20160202T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3283@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:At present\, the largest source of uncertainty in the extracti
on of the Higgs properties from LHC data comes from the theory error on t
he production cross section. We recently managed to obtain a dramatic red
uction of this uncertainty with the calculation of the gluon-fusion produ
ction rate through the next-to-next-to-next to leading order (N^3LO) in Q
CD.\nI will give an overview of the tools that we employed to achieve this
result\, discuss the various contributions that enter the final cross se
ction\, and assess the remaining theory uncertainty.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3283
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthias Neubert on An Effective Field Theory for
Jet Processes
DTSTART;VALUE=DATE-TIME:20151124T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3294@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Processes involving narrow jets receive perturbative correctio
ns enhanced by logarithms of the jet opening angle and the ratio of the en
ergies inside and outside the jets. Analyzing cone-jet processes in effect
ive field theory\, we find that in addition to soft and collinear fields t
heir description requires momentum modes which are simultaneously soft and
collinear to the jets. These collinear-soft particles can resolve individ
ual collinear partons\, leading to a complicated multi-Wilson-line structu
re of the associated operators at higher orders. Our effective field theor
y fully separates the physics at different energy scales. Solving its reno
rmalization-group equations resums all logarithmically enhanced higher-ord
er terms in cone-jet processes\, in particular also the non-global logarit
hms.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3294
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Farinaldo Queiroz on Highlights on Dark Matter co
mplementarity
DTSTART;VALUE=DATE-TIME:20151208T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3303@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We review what dark matter complementarity is really all about
\, and stress some features concerning this paramount complementarity app
roach in the light of current and upcoming projected results. \nWe will pa
rticularly highlight intriguing signals from gamma-ray searches that might
be connected to the presence of dark matter in our galaxy.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3303
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jérémie Quevillon on The Universal One-Loop Eff
ective Action
DTSTART;VALUE=DATE-TIME:20151027T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3343@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, we present the universal one-loop effective act
ion obtained by integrating out massive\, non- degenerate multiplets\, foc
using on the coefficients of operators of dimension up to six composed of
Standard Model fields. Our general results may be applied to loops of non-
degenerate heavy fermions or bosons. We discuss the relationship of our re
sults to the SM Effective Field Theory. As an example\, we apply our metho
d to the general MSSM with non-degenerate stop squarks.\nWe then discuss t
he present and possible future indirect constraints on stop masses.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3343
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lorenzo Vitale on Solving strongly-coupled RG flo
ws via exact diagonalization
DTSTART;VALUE=DATE-TIME:20151201T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3365@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present a new class of numerical methods\, dubbed "Hamilto
nian truncation"\, to solve the IR dynamics of strongly-coupled QFTs. \nWe
report on the promising results of our early studies\, where we apply the
se techniques to the Phi^4 theory in 2D. \nFinally\, we outline a few rese
arch directions to make "Hamiltonian truncation" a powerful tool to solve
strongly-coupled RG flows in any dimension.
LOCATION:THEP Social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3365
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Enrico Herrmann on Hidden properties of non-plana
r amplitudes in N=4 SYM
DTSTART;VALUE=DATE-TIME:20151215T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3370@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Scattering amplitudes in planar 𝑁 = 4 SYM have many interes
ting properties: dual con- formal and Yangian symmetries\, connection to W
ilson loops and integrability\, formula- tion using on-shell diagrams\, po
sitive Grassmannian and Amplituhedron. None of them is true when we go bey
ond the planar limit. I will show that quite surprisingly the non planar a
mplitudes still posses the same properties as their planar counterparts su
ggesting the existence of hidden symmetries and new formulations in the co
mplete 𝑁 = 4 SYM.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3370
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andreas Crivellin on Explaining the flavour anoma
lies
DTSTART;VALUE=DATE-TIME:20160107T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3384@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Even though no new particles were discovered at the LHC so far
\, LHCb found deviations from the standard model predictions in b->smumu
transitions with a significance above the 4 sigma level. Furthermore\, C
MS found hints for the decay h->taumu and BaBar\, BELLE and LHCb observed
hints for lepton flavour non-universality in tauonic B decays.\n\nIn this
talk I review various possibilities how to explain these deviations from
the SM expectations in some NP models. Possible candidates are models wi
th leptoquarks\, but especially Z' models with additional Higgs doublets
provide a well motivated explanation of the anomalies and predict interes
ting correlations\, for example in tau->mumumu\, and could also be direct
ly discoverable at the LHC.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3384
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thomas Van Riet on Some challenges for the landsc
ape
DTSTART;VALUE=DATE-TIME:20160119T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3388@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will present a bird's view on how string theory tackles the
question of vacuum energy. The talk is intended to be pedagogical and aime
d at a general audience of theoretical physicists (No string theory knowle
dge is required.). I will first explain how vacuum energy can be computed
in certain corners of string theory and what one might hope to deduce from
this. Near the end I will specify to the problem of constructing de Sitte
r vacua of string theory and I will discuss whether this has been successf
ul or not.
LOCATION:Gernot-Gräff room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3388
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gabriel Lee on Higgs Bosons in Heavy Supersymmetr
y with an Intermediate mA
DTSTART;VALUE=DATE-TIME:20160118T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3389@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The minimal supersymmetric standard model leads to precise pre
dictions of the properties of the light Higgs boson degrees of freedom tha
t depend on only a few relevant supersymmetry breaking parameters. In part
icular\, there is an upper bound on the mass of the lightest neutral Higgs
boson\, which for a supersymmetric spectrum of the order of a TeV is bare
ly above the one of the Higgs resonance recently observed at the LHC. This
bound can be raised by considering a heavier supersymmetric spectrum\, re
laxing the tension between theory and experiment. In a previous article\,
we studied the predictions for the lightest CP-even Higgs mass for large v
alues of the scalar-top and heavy Higgs boson masses. In this article we p
erform a similar analysis\, considering also the case of a CP-odd Higgs bo
son mass mA of the order of the weak scale. We perform the calculation usi
ng effective theory techniques\, considering a two-Higgs doublet model and
a Standard Model-like theory and resumming the large logarithmic correcti
ons that appear at scales above and below mA\, respectively. We calculate
the mass and couplings of the lightest CP-even Higgs boson and compare our
results with the ones obtained by other methods.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3389
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pedro Liendo on Surface critical exponents from t
he Conformal Bootstrap
DTSTART;VALUE=DATE-TIME:20160301T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3398@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We explore the consequences of crossing symmetry for conformal
field theories in the presence of a boundary\, which is a model for surfa
ce critical behavior. After reviewing the possible surface transitions ass
ociated with a bulk universality class\, we will proceed to estimate surfa
ce critical exponents numerically. Our results show good agreement when co
mpared with other methods\, like Monte Carlo simulations and epsilon expan
sion calculations.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3398
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Tung on Acoustics in Curved Spacetime
DTSTART;VALUE=DATE-TIME:20160426T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3440@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In recent years metamaterials have provided researchers and en
gineers with unprecedented tools for the design and construction of artifi
cial devices with remarkable properties exceeding the possibilities found
in nature. While optical metamaterials have been the focus of continued in
terest for the last decade acoustic metamaterials have only recently drawn
the attention of researchers. Nevertheless\, the considerable successes i
n the design of optical analogue models of gravity should also carry over
to investigations for physical systems describing sound propagation in aco
ustic metamaterials—though with major modifications. The simulation of o
ptical and acoustic phenomena with curved background spacetimes not only p
oses challenges in engineering\, but may also raise fundamental questions
beyond their possible verification in the laboratory.\nThis presentation d
evelops and explains a novel technique to model acoustic wave propagation
on a curved spacetime based on a fundamental variational principle in comb
ination with powerful differential-geometric methods. Its aim is to comple
tely describe the evolution of acoustic pressure through an appropriate no
n-dissipative metamedium.\nIn the proposed framework we derive the partial
differential equation for the acoustic potential which governs the wave p
ropagation on the underlying curved spacetime. The time dependence is usua
lly harmonic and a Sturm-Liouville problem emerges for the remaining spati
al variables. For some cases it is possible to obtain analytical solutions
allowing for an exhaustive analysis of the expected wave predictions. Of
major concern is also the design and implementation of a particular acoust
ic space- time. We derive and use the so-called constitutive equations whi
ch directly relate the physical acoustic parameters to a particular spacet
ime.\nAs a first example we show how to implement acoustic wave propagatio
n for the Poincare ́ half-plane model. It is the simplest and one of the
most thoroughly investigated non-Euclidean models of two- dimensional hype
rbolic geometry. This makes it an ideal spacetime candidate for the implem
entation and study of an acoustic metamaterial. In the second application
we demonstrate how to implement the gravitational frequency-shift analogue
in acoustics\, i.e.\, the acoustic imitation of a shift in radiation freq
uency due to a gravitational field. We close this discussion with a brief
examination of Maxwell’s fish-eye lens in spacetime acoustics as it migh
t facilitate the construction of perfect acoustic focussing devices.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3440
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jessica Turner on Leptonic observables from A5 wi
th Generalised CP and prospects for their discovery
DTSTART;VALUE=DATE-TIME:20160524T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3441@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The observed leptonic mixing pattern could be explained by the
presence of a discrete flavour symmetry broken into residual subgroups at
low energies. In this scenario\, a residual generalised CP symmetry allow
s the parameters of the PMNS matrix\, including Majorana phases\, to be pr
edicted in terms of a small set of input parameters. We study the mixing p
arameter correlations arising from the symmetry group A5 including general
ised CP subsequently broken into all of its possible residual symmetries.
Focusing on those patterns which satisfy present experimental bounds\, we
then provide a detailed analysis of the measurable signatures accessible t
o the planned reactor\, superbeam and neutrinoless double beta decay exper
iments.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3441
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christopher Wever on On the reduction and evaluat
ion of Generalized Polylogarithms up to weight four
DTSTART;VALUE=DATE-TIME:20160531T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3442@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The need to perform multi-loop calculations has become commonp
lace in the LHC era. Experience shows that a large class of multi-loop Fey
nman integrals are expressible in terms of so-called Generalized (or Gonch
arov) polylogarithmic functions\, which are an extension of the usual clas
sical polylogarithms. It has previously been conjectured that up to weight
four\, these functions are expressible in terms of the classical (poly-)l
ogarithms Log\, Li_2\, Li_3\, Li_4 and one extra function Li_{2\,2}. In th
is talk I will discuss how one can prove this conjecture. I will also disc
uss our numerical implementation of the classical (poly-)logarithms and Li
_{2\,2} in C++.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3442
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexander Merle on Radiative Neutrino Masses: Ric
h Nu Connections
DTSTART;VALUE=DATE-TIME:20160607T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3443@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will discuss the rich phenomenology of radiat
ive models\, which generate a neutrino mass only at loop level. After givi
ng an introduction to the principal ideas behind this class of theories\,
I will highlight certain aspects of particular types of settings. On the o
ne hand\, I will discuss how strongly renormalisation group running can be
enhanced in radiative models\, with the probably most popular 1-loop mode
l serving as example. On the other hand\, I will focus strongly on the com
plementarity between probing these models from both sides\, low and high e
nergies\, by connecting the information available from neutrinos/LFN/LFV a
nd collider physics. As we will see\, radiative models can strongly relate
both experimental sides\, thereby opening up the possibility for a compre
hensive study of these models.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3443
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jens Hoff on The package TopoID and its applicati
ons to Higgs physics
DTSTART;VALUE=DATE-TIME:20160614T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3444@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I explain the main techniques behind the {tt Mathematica} pack
age {tt TopoID} which aims at automation of multiloop calculations. One
application is the N\\(^3\\)LO Higgs boson cross section for which we re
cently completed the calculation of the contribution from the \\(qq^\\pri
me\\)-channel. As another application we considered the cross section fo
r Higgs boson pairs at NLO and at NNLO in the soft-virtual approximation
including effects of the top quark mass.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3444
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dmitry Chicherin on Correlation functions in N=4
super-Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20160628T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3445@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Correlation functions of local gauge-invariant operators are n
atural observables in any conformal quantum field theory.\nIn N=4 SYM a pa
rticular role is played by the multipoint supercorrelators of the stress-t
ensor multiplet. Their chiral truncation in the light-cone limit coincides
with the scattering superamplitudes. We propose a novel approach to calcu
lating such correlators based on reformulation of the theory in Lorentz ha
rmonic chiral superspace which introduces an infinite number of auxiliary
higher-spin fields and pure gauges. This technique enables us to obtain th
e integrands of all such supercorrelators\, including the non-chiral secto
r\, at any loop order.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3445
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lorenzo Ubaldi on A relaxing inflaton
DTSTART;VALUE=DATE-TIME:20160712T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3446@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The relaxion is potentially a new class of solutions to the Hi
ggs hierarchy problem. I first briefly review the main ingredients of the
original relaxion proposal\, and then report work in progress about attemp
ts to have the relaxion play also the role of the inflaton.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3446
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Shao-Feng Ge on The Leptonic Dirac CP Phase from
Residual Symmetry and Measurement with Muon Decay at Rest
DTSTART;VALUE=DATE-TIME:20160621T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3467@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:With the 1-3 mixing angle measured at reator neutrino experime
nts\, Daya Bay and RENO\, there are still three unknown oscillation variab
les\, the neutrino mass hierarchy\, the octant of the atmospheric mixing a
ngle\, and the leptonic CP phase. Of these three\, the CP phase is the mos
t difficult to measure precisely and important for distinguishing flavor s
ymmetries. In this talk I will first talk about residual symmetries\, whic
h takes the role as low energy effective field theory for neutrino mixing
and is analogy of custodial symmetry in the electroweak sector\, to predic
t the CP phase from the measured mixing angles and then introduce a new ty
pe of neutrino experiment muDAR (muon decay at rest) to measure the CP pha
se. Currently\, T2K and NOvA are designed for this measurement. Neverthele
ss\, they suffer from degeneracy and efficiency problems. The situation ca
n be improved by adding a muDAR source. A combination TNT2K\, with T2(H)K
running in neutrino mode and muDAR in anti-neutrino mode using the same de
tector(s)\, can measure the CP phase more precisely and break the degenera
cy between delta and 180^o - delta. The same configuration can also apply
to next-generation medium baseline reactor neutrino experiments like JUNO
and RENO-50\, enhancing their physics potential from mass hierarchy to als
o CP phase. With only one source and no extra detector\, this dessign is m
uch better than DAEdLAS which requires 3 sources\, but only 20% duty facto
r and 4 times higher luminosity for each. In addition\, TNT2K can partiall
y break the contamination from non-unitarity\, which can make the CP sensi
tivity at T2K/NOvA to completely disappear\, and a further addition of a n
ear detector can fully retrieve the ability of CP measurement.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3467
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Stefan Alte on Exclusive Decays of Z and Higgs Bo
sons in QCD Factorisation
DTSTART;VALUE=DATE-TIME:20160419T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3492@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present an analysis of exclusive radiative decays of Z and
Higgs bosons into final states containing a highly energetic meson. We emp
loy the Quantum Chromodynamics (QCD) factorisation approach. In this appro
ach\, perturbatively calculable hard functions account for effects at ener
gy scales corresponding to the masses of the decaying bosons\, whereas lig
ht-cone distribution amplitudes (LCDAs) describe the hadronic bound-state
effects inside the meson. \n\nWe explore the decays of a Z boson into an e
ta(') meson and a photon within the Standard Model (SM). The decay amplitu
de receives two contributions\, one involving the leading order (LO) quark
LCDA and one involving the LO gluon LCDA of the meson. We find branching
ratios which exhibit a very strong sensitivity to the hadronic input param
eters. Measuring these decays in the future at an electron-positron collid
er running at the Z pole could provide valuable insights into the hadronic
parameters in general and the gluon LCDA in particular.\n\nIn our analysi
s of the decays of a Higgs boson into a meson and a Z or W boson\, our foc
us lies on the effect of flavour-changing Yukawa couplings present in mode
ls beyond the Standard Model. We find two different contributions to the d
ecay amplitude. The first contribution arises from diagrams where the Higg
s boson couples to the quark-antiquark pair forming the meson. For this co
ntribution\, we apply the QCD factorisation framework. The second contribu
tion involves diagrams where the Higgs boson couples to two gauge bosons.
One gauge boson is virtual and converts into the meson. In the SM\, the fi
rst contribution is strongly suppressed. This changes when we allow for fl
avour-changing Yukawa couplings in a model-independent way by introducing
an effective Lagrangian. In particular in the decays into B^+_(c) mesons\,
the first contribution is very sensitive to the off-diagonal Yukawa coupl
ings Y_ut or Y_ct. In the most extreme scenario allowed by current constra
ints on these parameters\, the branching ratio for the decay into B^+ can
be enhanced by a factor of 1000.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3492
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Filippo Sala on WIMP Dark Matter at gamma-ray tel
escopes
DTSTART;VALUE=DATE-TIME:20160503T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3523@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Weakly interactive massive particles (WIMP)\, as candidates of
Dark Matter\, motivate new physics at the TeV scale independently of elec
troweak naturalness. What will be the role of gamma-ray telescopes in prob
ing this paradigm\, also in comparison with other experiments\, like colli
ders? I will examine this question in the case of electroweak multiplets\,
which constitute a WIMP ``prototype’’\, and are further motivated by
Supersymmetry and Minimal Dark Matter. This will bring me to discuss our u
nderstanding of the DM properties in the Milky Way\, and in particular the
directions in which we need improvements\, in order to best exploit teles
copes like Fermi\, HESS and CTA.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3523
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andrey Grozin on B-meson B parameter from HQET su
m rules
DTSTART;VALUE=DATE-TIME:20160510T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3526@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:B^0 - bar{B}^0 oscillations are characterized by the matrix el
ement of a 4-quark operator Q. This matrix element is usually written as t
he product of its factorized value and the parameter B which describes fac
torization breaking. It is a non-perturbative quantity\, and its value can
be obtained from lattice simulations or QCD sum rules. Here we investigat
e these sum rules in the framework of heavy quark effective theory (HQET)
at the leading order in 1/m_b\, taking the first alpha_s corrections into
account.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3526
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Nikolay Bobev on Holography for N=1^* on S^4
DTSTART;VALUE=DATE-TIME:20160517T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3528@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss the gravitational dual of a mass deformation of
N=4 SYM\, called N=2* SYM\, on S^4. Using holographic techniques one can
calculate the universal contribution to the corresponding free energy in t
he planar limit and at large 't Hooft coupling. The result matches the exp
ression recently computed using supersymmetric localization in the field t
heory. This agreement provides a non-trivial precision test of holography
in a non-conformal setting. I will also discuss the extension of these res
ults to mass deformations of N=4 SYM with N=1 supersymmetry.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3528
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexander Zhiboedov on The S-matrix Bootstrap and
The Leading Regge Trajectory
DTSTART;VALUE=DATE-TIME:20160527T123000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3530@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We consider a tree-level meromorphic\, unitary and crossing sy
mmetric scattering amplitude. We set up bootstrap equations and use them t
ogether with unitarity to constrain the asymptotic form of the leading Reg
ge trajectory.
LOCATION:Minkowski room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3530
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Vajravelu Ravindran on Three loop QCD results for
the Pseudo-scalar Higgs boson production at the LHC
DTSTART;VALUE=DATE-TIME:20160523T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3534@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present the first results on the production of pseudo-scala
r through gluon fusion at the LHC to threshold N3LO in QCD taking into acc
ount only soft gluon effects. We have used the effective Lagrangian that d
escribes the coupling of pseudo-scalar with the gluons in the large top qu
ark mass limit. We first present the computation of three loop pseudo-sca
lar form factor and then use use the available informations on the third
order universal soft function in QCD to achieve this. In addition\, we al
so present the process dependent resummation coefficient for threshold res
ummation to N3LL in QCD.\nPhenomenological impact of these threshold N3LO
corrections to pseudo-scalar production at the LHC is discussed and their
role to reduce the renormalisation scale dependence is demonstrated.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3534
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Yang-Ting Chien on Energy profile and hadron frag
mentation inside jets
DTSTART;VALUE=DATE-TIME:20160613T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3538@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The jet shape and the jet fragmentation function describe tran
sverse and longitudinal distribution of QCD radiations inside jets. Their
precise calculations suffer from large logarithms of angular parameters wh
ich enter the observable and the jet definitions\, especially for jets wit
h small radii. In this talk I will explain how we can manage to resum thes
e logarithms using soft-collinear effective theory. These observables rece
ive dominant contributions from collinear radiations and the factorization
theorems simplify dramatically. The characteristic jet scales can be iden
tified and the logarithms are resummed using renormalization group and DGL
AP evolution equations. In the end I will show the comparison with the LHC
data with very nice agreement. Our work provide novel frameworks and have
established as the baseline for the studies of jet substructure modificat
ions in heavy ion collisions.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3538
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kiel Howe on Little Hierarchy and Induced EWSB in
pNGB Higgs Models.
DTSTART;VALUE=DATE-TIME:20160719T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3557@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The scale of electroweak symmetry breaking (EWSB) can be prote
cted if the Higgs is a pseudo-Nambu Goldstone Boson (pNGB) of a global sym
metry larger than the Standard Model gauge group. The global-symmetry brea
king implied by the Standard Model interactions and current direct experim
ental limits gives a minimal tuning of the weak scale to a degree of ~20%.
However\, this little hierarchy problem is exacerbated in many concrete m
odels\, where generating a Higgs mass of 125 GeV requires a stronger break
ing of the shift symmetry and leads to tuning a degree worse than ~1%. If
the low energy structure of the Higgs potential is extended\, this extra t
uning can be avoided. We describe one such modification\, "Induced Electro
weak-Symmetry Breaking"\, and its application to the minimal composite Hig
gs models (MCHM) and the Twin Higgs.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3557
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kohsaku Tobioka on Cascade Slow Roll
DTSTART;VALUE=DATE-TIME:20160704T160000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3560@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Particle production takes important rolls in the early univers
e\, such as during inflation\, preheating and reheating eras. I discuss pa
rticle production of many species as a new slow roll mechanism. In particu
lar\, the effect is exponentially enhanced by cascade decays. Also\, such
particle production can be relevant to a recent idea\, cosmological relax
ion mechanism. This is a blackboard talk and based on preliminary results.
LOCATION:Social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3560
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ranjan Laha on Two new avenues in dark matter ind
irect detection
DTSTART;VALUE=DATE-TIME:20160921T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3579@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Indirect detection is one of the major ways to search for dark
matter.\nIn this talk\, I will introduce two new techniques. Firstly\, I
will show how telescopes with ~ 0.1% energy resolution can exploit the Do
ppler shift of sharp photon features arising from dark matter interactions
and separate the signal from background. Although the technique is gener
al\, I will give an example of this search strategy with the 3.5 keV line.
In the second half of my talk\, I will show how limits from the searches
for very high energy photons can be used to constrain dark matter interac
tions. As an example\, I will compare these limits with the dark matter i
nterpretation of the "IceCube excess neutrinos".
LOCATION:Minkowski Room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3579
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sabya Chatterjee on Impact of a eV scale sterile
neutrino in Long Baseline Experiments
DTSTART;VALUE=DATE-TIME:20161018T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3599@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will basically discuss the impact of one eV s
cale sterile neutrino on the long-baseline neutrino oscillation experiment
s taking T2K\, NO\\(\\nu\\)A and DUNE as a case study. I will start with a
brief intruduction to some experimentally observed neutrino anomalies and
then I will intruduce an eV scale sterile neutrino with some theoretical
framework\, as a possible solution to resolve those anomalies. For realist
ic benchmark values of the mass-mixing parameters taken from global fits o
f oscillation data\, we find that the performance of all these experiments
in claiming the discovery of the CP-violation(CPV) induced by the standar
d CP-phase \\(\\delta_{13}\\equiv \\delta\\) and the neutrino mass hierarc
hy (MH) gets deteriorated. However DUNE has a good opportunity to probe th
e CPV induced by the new CP phases \\(\\delta_{14}\\) and \\(\\delta_{34}\
\) in contrast to T2K and NO\\(\\nu\\)A where the sensitivity is less. We
also estimate the capability of reconstructing the true values of two CP-p
hases \\(\\delta_{13}\\) and \\(\\delta_{14}\\) in combined analysis of T2
K and NO\\(\\nu\\)A and then DUNE alone. The typical 1\\(\\sigma\\) level
uncertainties on these reconstructed phases are approximately \\(40^0\\)
for \\(\\delta_{13}\\) and \\(50^0\\) for \\(\\delta_{14}\\) in case of T2
K and NO\\(\\nu\\)A\, where as for DUNE it is \\(\\sim 20^0(30^0)\\) for \
\(\\delta_{13} (\\delta_{14})\\) if \\(\\theta_{34}\\) = 0.\nHowever the r
econstruction of \\(\\delta_{14}\\) (but not that of \\(\\delta_{13}\\)) a
ppreciably degrades if \\(\\theta_{34}\\) is large. Finally\, I will show
the new ambiguity in resolving the octant of \\(\\theta_{23}\\) in presenc
e of sterile neutrino.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3599
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christian Schubert on Schwinger pair creation in
constant and time-dependent fields
DTSTART;VALUE=DATE-TIME:20161220T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3600@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The effect of pair creation from the vacuum in a strong electr
ic field\, predicted by Schwinger in 1951\, may conceivably be confirmed e
xperimentally with some of the ultrastrong lasers presently under construc
tion. However\, it is not easy to calculate the effect for realistic laser
fields. I will review here some of the methods available for the cases of
a constant or purely time-dependent electric field\, such as WKB\, worldl
ine instantons\, or quantum Vlasov equations. \nSome issues of theoretical
interest will also be discussed\, such as radiative corrections and the r
elated issue of a field-dependent electron mass.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3600
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sophia Borowka on Higgs Pair Production in gluon
fusion at NLO with full top mass dependence
DTSTART;VALUE=DATE-TIME:20170117T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3601@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The calculation of Higgs boson pair production in gluon fusion
at next-to-leading order in the strong coupling constant with full top-qu
ark mass dependence is presented.\nThe usage of the programs GoSam\, Reduz
e and SecDec for the computation and numerical evaluation of the most comp
licated piece\, the virtual two-loop amplitude\, is explained.\nA comparis
on of the cross section of the exact result with previous approximations\,
as well as the invariant mass and pT distribution are shown. Further\, t
he variation of the triple Higgs coupling is discussed.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3601
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: David Marzocca on Challenges in the global EFT in
terpretation of LHC data
DTSTART;VALUE=DATE-TIME:20170131T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3602@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will discuss the effective field theory (EFT) a
pproach to precision new physics searches\, with a particular focus on ele
ctroweak and Higgs processes. After an introduction on the present status
of constraints in the EFT I will present the main challenges one faces whe
n interpreting data on processes like diboson production or electroweak Hi
ggs production at the LHC in an EFT context. In particular\, I will discus
s the issue of the validity of the EFT approach in such cases and what are
the possible strategies to keep it under control.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3602
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Leonardo Vernazza on Two-parton scattering in the
high-energy limit
DTSTART;VALUE=DATE-TIME:20170207T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3603@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Considering 2 to 2 gauge-theory scattering with general colour
in the high-energy limit\, we compute the Regge-cut contribution to three
loops through next-to-next-to-leading high-energy logarithms (NNLL) in th
e signature-odd sector. Our formalism is based on using the non-linear Bal
itsky-JIMWLK rapidity evolution equation to derive an effective Hamiltonia
n acting on states with a fixed number of Reggeized gluons. A new effect o
ccurring first at NNLL is mixing between states with k and k+2 Reggeized g
luons due non-diagonal terms in this Hamiltonian. Our results are consiste
nt with a recent determination of the infrared structure of scattering amp
litudes at three loops\, as well as a computation of 2 to 2 gluon scatteri
ng in N=4 super Yang-Mills theory. Combining the latter with our Regge-cut
calculation we extract the three-loop Regge trajectory in this theory. Ou
r results open the way to predict high-energy logarithms through NNLL at h
igher-loop orders.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3603
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Wieland Staessens on A Stringy Appreciation of Ax
ions for Inflationary Purposes
DTSTART;VALUE=DATE-TIME:20161213T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3604@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Their characteristic features make axions popular candidates f
or realisations of large field inflationary models. In combination with th
eir abundant emergence from string theory compactifications\, one might ho
pe to construct a fully consistent model for large field inflation in a UV
complete theory. In this talk we focus on two distinct avenues: axion mon
odromy and axion mixing scenarios\, and discuss their perks and peeves.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3604
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Eirik Svanes on Recent Advances in Heterotic Modu
li
DTSTART;VALUE=DATE-TIME:20161129T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3605@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss recent advances in addressing the heterotic mod
uli problem in six and seven dimensions. To map out the reduction to a low
er dimensional effective theory\, and in a quest to complete our understan
ding of the generically torsional geometries that appear\, it is important
to have a good understanding the moduli of these geometries. I will revie
w the infinitesimal moduli space in six dimensions\, and comment on some r
ecent advances in understanding its geometric properties\, in addition to
higher order deformations and obstructions. I will then explain how a simi
lar story is emerging in seven dimensional compactifications on more exoti
c manifolds with G2-structure\, giving hope that similar tools can be appl
ied to understand moduli in other areas of string theory\, with possible a
pplications to phenomenology and AdS/CFT.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3605
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Vladimir Kazakov on New QFTs and integrable Feynm
an graphs from strongly twisted N=4 SYM and ABJM
DTSTART;VALUE=DATE-TIME:20161115T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3606@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I discuss the recently proposed by O.Gurdogan and myself new
QFTs in 3 and 4 dimensions integrable in planar limit. They emerge in the
double scaling limit (strong gamma-deformation\, weak coupling) from N=4
SYM and ABJM theories and inherit their integrability. In the simplest ca
se\, such a 4D theory reduces simply to two interacting complex scalars wi
th a specific interaction term. Its typical planar graphs are of the "fi
shnet" type\, shown integrable by A.Zamolodchikov (1980) in virtue of the
star-triangle relations. For most of the physical quantities (correlators
\, amplitudes) each order of perturbation theory is defined at most by a
single such graph. This allows to use the powerful AdS/CFT integrability t
ools for computations of new multi-loop Feynman graphs (wheel graphs\, spi
der-web graphs etc.). We will also discuss the relation of these models t
o non-compact integrable quantum spin chains with the symmetry of 3D and 4
D conformal groups.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3606
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Clara Peset on Nonrelativistic effective field th
eories for bound states: muonic hydrogen and the \\(B_c\\)
DTSTART;VALUE=DATE-TIME:20161025T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3608@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Nonrelativistic effective field theories have proven to be an
extremely powerful tool in the description of diverse scenarios in partic
le physics. They provide us with a wide range of theoretical predictions o
therwise out of reach for us. We will introduce the theoretical motivation
and set up of these type of theories and as an application we will study
two relevant bound state systems described by them: the Lamb shift in muon
ic hydrogen\, from which the proton radius and the hyperfine splitting can
be obtained\, and the \\(B_c\\) system\, which is a useful place where to
obtain a determination of the heavy quark masses and the \\(V_{cb}\\) CKM
-matrix element. The relevant theories in the description of these systems
are potential nonrelativistic QED (pNRQED) and potential nonrelativistic
QCD (pNRQCD) respectively. Both theories provide us with a well defined po
wer counting\, that gives us control both on out computations and on the s
ize of the uncomputed terms. In order to gain enough precision to competit
ively compare to current experiments\, we perform our computations at next
-to-next-to-next-to leading order. This means we obtain the spectrum up to
terms of order m*alpha^5.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3608
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Rasmus Sloth Lundkvist on Averaging the oscillati
ons of supernova neutrinos
DTSTART;VALUE=DATE-TIME:20161108T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3609@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:When a heavy star reaches the end of its life\, it explodes in
a core collapse supernova emitting more than 99% of the released energy a
s neutrinos. The neutrinos are produced at the centre of the supernova and
as they travel through its dense layers\, their flavour is changed by an
interplay between the background and their vacuum masses. I will explain h
ow we can explicitly describe decoherence effects in such a neutrino gas s
tarting from neutrino wave packets. Afterwards\, I will turn to the non-li
near effects that arise because the neutrinos themselves are a part of the
background. These effects include collective oscillations\, but they also
cover the recently discovered effects that result from going beyond a sph
erically symmetric emission model for the supernova neutrinos.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3609
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Xavier Calmet on Effective Quantum Gravity: Appli
cations to Cosmology\, Gravitational Waves and Black Holes
DTSTART;VALUE=DATE-TIME:20161117T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3610@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will review recent progress in our understandin
g of quantum gravity within the framework of effective field theory. I wil
l then describe applications to model building in inflation (in particular
Higgs/Starobinsky inflation)\, gravitational waves and black holes.
LOCATION:Social Room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3610
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ed Hardy on Stellar cooling bounds on new light p
articles: including plasma effects
DTSTART;VALUE=DATE-TIME:20161122T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3611@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Strong constraints on the coupling of new light particles to t
he Standard Model (SM) arise from their production in the hot cores of sta
rs\, and the effects of this on stellar cooling. However\, the large elect
ron density in stellar cores significantly modifies the in-medium propagat
ion of SM states. I will show that\, for new light particles which have an
effective in-medium mixing with SM states\, this can result in parametric
ally different production rates to those obtained from a naive calculation
.\nTaking these previously-neglected contributions into account\, I will g
ive updated estimates for the stellar cooling bounds on a number of light
new particle candidates. In particular\, the bounds on light (m < keV) sca
lars coupling to electrons (nucleons) are strengthened by up to 5 (up to 3
) orders of magnitude in the coupling squared. Supernova cooling bounds o
n dark photons are also significantly modified.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3611
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthew McCullough on A Clockwork Theory
DTSTART;VALUE=DATE-TIME:20161206T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3612@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will the hierarchy problem from a known\, but l
ess mainstream direction. I will argue that the hints we have observed fo
r high energy physics may in fact be a smokescreen\, with the new physics
responsible for these hints lying much closer to accessible energies. A n
ew mechanism\, the clockwork\, will be proposed as an underlying explanati
on for this smokescreen and connections to extra-dimensional scenarios wil
l be sketched.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3612
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Iason Baldes on Flavour Cosmology: Dynamical Yuka
was in the Froggatt-Nielsen Mechanism
DTSTART;VALUE=DATE-TIME:20170124T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3613@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:If the Standard Model Yukawa couplings varied in the early uni
verse and started with order one values before electroweak symmetry breaki
ng\, the CP violation associated with the CKM matrix could be the origin o
f the matter-antimatter asymmetry. The large effective Yukawa couplings wh
ich lead to the enhanced CP violation can also help in achieving a strong
first-order electroweak phase transition. In this talk\, I will discuss th
e implementation of dynamical Yukawa couplings in the context of the Frogg
att--Nielsen mechanism.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3613
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christoph Meyer on Transforming multi-loop Feynma
n integrals to a canonical basis
DTSTART;VALUE=DATE-TIME:20170110T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3614@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the past years the method of differential equations has pro
ven itself to be a powerful tool for the computation of multi-loop Feynman
integrals. This method relies on the choice of a basis of master integral
s in which the dependence on the dimensional regulator factorizes. I will
present an algorithm that automatizes the transformation to such a basis\,
starting from a given basis that is obtained for instance by one of the p
ublicly available Laporta implementations. The algorithm is applicable to
differential equations with multiple scales and rational dependence on the
dimensional regulator. An implementation of the algorithm in Mathematica
will be shown and its application to multi-scale problems will be illustra
ted.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3614
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Simon Plaetzer on Parton Shower Event Generators:
Status and Prospects in the Quest for Precision
DTSTART;VALUE=DATE-TIME:20170418T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3733@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Event generators are indispensable tools which bridge the gap
between theoretical and experimental collider physics. At the same time
they have become the accuracy bottleneck for relating ever more precise th
eoretical predictions to equally accurate experimental observations. I wil
l discuss recent development on improving the accuracy of these simulatio
ns\, and how future development will face a change in paradigm of how par
ton shower algorithms are constructed.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3733
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Rudi Rahn on Automation of calculations in Soft-C
ollinear Effective Theory
DTSTART;VALUE=DATE-TIME:20170425T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3734@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The perturbative treatment of multi-scale problems in collider
physics is generically plagued by large logarithms in phase space regions
with widely separated scales. One approach to treat this problem is resum
mation\, which can be achieved in a natural way via RG equations in Soft-C
ollinear Effective Theory (SCET).\nIn this talk I will present SCET as an
effective theory of QCD and highlight its use to address resummation. I wi
ll focus on the evaluation of 2-loop dijet soft functions\, which are cruc
ial for NNLL resummation in SCET\, and present an algorithmic approach sui
table for automation and numerical treatment of a wide range of soft funct
ions. I will present an implementation of this strategy in the form of com
puter code\, and show some results - both new and validations of the liter
ature - computed with it.
LOCATION:Lorentz room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3734
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Johan Blaback on dS no-go and Minkowski solutions
DTSTART;VALUE=DATE-TIME:20170502T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3735@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Deriving a positive cosmological constant\, or four-dimensiona
l de Sitter spacetimes\, from ten-dimensional string theory is complicat
ed.\n Focusing on the problems that usually arise in such compactificatio
ns\, such as uplifting and moduli-stabilisation\, I will give an intro
duction conceptually explaining how one usually tackle these problems wh
en it comes to deriving de Sitter\, from string theory. I will then tran
sition into describing the implications of a recent no-go that was formu
lated by myself and a collaborator\, with some overview of the technical
requirements for the no-go.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3735
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Oliver Schlotterer on Relating one-loop string am
plitudes with maximal versus reduced supersymmetry
DTSTART;VALUE=DATE-TIME:20170613T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3736@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will report on recent progress in the study o
f one-loop string amplitudes with half-maximal and quarter-maximal supersy
mmetry. The structure of massless one-loop amplitudes is argued to follow
the patterns known from maximally supersymmetric cases with two additional
legs. Inspired by the Feynman diagrams in their field-theory limit\, I wi
ll explain the organizing principles of their tensor structure for externa
l gauge bosons and gravitons. In particular\, universal building blocks wi
ll be identified that apply to orbifold compactifications with both half-m
aximal and quarter-maximal supersymmetry.
LOCATION:Social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3736
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Beneke on TeV scale MSSM Dark Matter and t
he electroweak Sommerfeld effect
DTSTART;VALUE=DATE-TIME:20170523T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3737@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:For heavy MSSM dark matter with a dominant triplet (wino) comp
onent\, resummation of large quantum corrections due to the electroweak f
orce (the "Sommerfeld" effect) is imperative for a reliable calculation of
the annihilation cross section.\nIn this talk I first discuss how this is
done within the non-relativistic effective field theory of the full MSSM\
, including a brief discussion of finite temperature effects and the (ir)r
elevance of WIMPonium bound state capture processes. It is then investigat
ed whether dominantly wino dark matter with the correct thermally produced
relic density remains viable in the light of strong constraints from the
non-observation of cosmic ray and terrestrial dark-matter on nuclei scatte
ring signals.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3737
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tiziano Peraro on Multivariate reconstruction tec
hniques over finite fields for scattering amplitudes
DTSTART;VALUE=DATE-TIME:20170516T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3738@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will describe an algorithm for the reconstruction of rationa
l functions from their numerical evaluation over finite-fields. I wil
l then discuss its application to several techniques related to the calc
ulation of multi-loop scattering amplitudes. The method has good effici
ency and scales well with the number of variables and the complexity of
the problem. My main focus will be multi-loop integrand reduction via g
eneralized unitarity in QCD. I will illustrate how finite-field techniq
ues can be used in order to build an integrand basis\, generate loop int
egrands over unitarity cuts\, and reconstruct the analytic expression of
a complete integrand representation of an amplitude.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3738
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kai Schmidt-Hoberg on On self-interacting dark ma
tter: Current status and perspectives
DTSTART;VALUE=DATE-TIME:20170606T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3739@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will discuss the current status of self-interac
ting dark matter and what could be learned from a potential discovery. I w
ill in particular focus on implications of a velocity dependent self-inter
action cross section and discuss models featuring a light mediating partic
le.
LOCATION:Social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3739
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Zoltan Szor on Higher-order corrections for three
-jet rate in electron-positron annihilation using the (anti-)k_t algorithm
DTSTART;VALUE=DATE-TIME:20170620T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3740@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present our results performed in the CoLoRFulNNLO subtract
ion scheme for the three jet rate in electron-positron annihilation into
three jets using the exclusive kt clustering algorithm at next-to-next-to
-leading order in QCD perturbation theory. \nResults matched with next-to-
double logarithmic resummation are also shown compared to OPAL data.\nIn
addition we present our predictions using the anti-kt algorithm for elect
ron-positron colliders at next-to-next-to-leading order in perturbation th
eory matched with next-to-double logarithmic resummed prediction for the
first time.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3740
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tien-Tien Yu on Superradiance in rotating stars a
nd pulsar-timing constraints on dark photons
DTSTART;VALUE=DATE-TIME:20170509T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3742@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Rotational superradiance was theoretically shown to occur in b
lack hole spacetimes\; in the presence of massive bosonic degrees of freed
om\, superradiance triggers an instability that leads to peculiar gravitat
ional-wave signatures and black hole distribution in the spin-mass plane\,
which in turn can impose stringent constraints on ultralight fields. In t
his talk\, I will demonstrate that a similar effect occurs with rotating c
onducting spheres\, and I will discuss rotational superradiance effects ar
ound conducting stars. This has interesting consequences for dark photons\
, as massive dark photons would cause stars to spin down due to superradia
nt instabilities. The time scale of the spindown depends on the mass of th
e dark photon\, and on the rotation rate\, compactness\, and conductivity
of the star. Existing measurements of the spindown rate of pulsars place d
irect constraints on models of dark sectors.
LOCATION:Social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3742
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Robert Schabinger on Baikov-Lee Representations O
f Cut Feynman Integrals
DTSTART;VALUE=DATE-TIME:20170627T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3743@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, we discuss a general framework for the evaluati
on of d-dimensional cut Feynman integrals based on the Baikov-Lee represen
tation of purely-virtual Feynman integrals. We implement the generalized C
utkosky cutting rule using Cauchy s residue theorem and identify a set of
constraints which determine the integration domain. The method applies equ
ally well to Feynman integrals with a unitarity cut in a single kinematic
channel and to maximally-cut Feynman integrals. Our cut Baikov-Lee represe
ntation reproduces the expected relation between cuts and discontinuities
in a given kinematic channel and furthermore makes the dependence on the k
inematic variables manifest from the beginning. We apply our formalism to
the direct evaluation of a number of interesting cut Feynman integrals.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3743
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Toby Opferkuch on R-Parity Violation at the LHC
DTSTART;VALUE=DATE-TIME:20170704T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3744@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will address the LHC phenomenology of the MSSM
extended by a single R-parity violating coupling at the unification scale.
Through the categorization of the lightest supersymmetric particle (LSP)
I will discuss the possible LHC signals and their present coverage. We hav
e also recast many existing LHC searches to set limits on all R-parity vio
lating couplings based on CMSSM boundary conditions\, as an example of a s
pecific complete supersymmetric model. Finally\, I will highlight how thes
e constraints compare with the R-parity conserving CMSSM.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3744
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Admir Greljo on B-physics anomalies: a guide to c
ombined explanations
DTSTART;VALUE=DATE-TIME:20170714T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3745@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Motivated by additional experimental hints of Lepton Flavour U
niversality violation in B decays\, both in charged- and in neutral-curren
t processes\, we analyse the ingredients necessary to provide a combined d
escription of these phenomena. By means of an Effective Field Theory (EFT)
approach\, based on the hypothesis of New Physics coupled predominantly t
o the third generation of left-handed quarks and leptons\, we show how thi
s is possible. We demonstrate\, in particular\, how to solve the problems
posed by electroweak precision tests and direct searches with a rather nat
ural choice of model parameters\, within the context of a U(2)qxU(2)L flav
our symmetry. We further exemplify the general EFT findings by means of si
mplified models with explicit mediators in the TeV range: coloured scalar
or vector leptoquarks and colour-less vectors. Among these\, the case of a
n SU(2)L-singlet vector leptoquark emerges as a particularly simple and su
ccessful framework.
LOCATION:Social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3745
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Chien-Thang Tran on Tau polarization as probe for
New Physics in the decays Bbar^0 to D* tau^- nubar_tau
DTSTART;VALUE=DATE-TIME:20170505T123000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3772@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:arXiv:1702.06910 We study the longitudinal\, transverse\, and
normal polarization components of the tau in the decays \\(\\bar{B}^0 \\to
D^{(ast)}\\tau^-\\bar\\nu_{\\tau}\\) and discuss their role in searching
for new physics (NP) beyond the standard model (SM). Starting with a model
-independent effective Hamiltonian including non-SM four-Fermi operators\,
we obtain experimental constraints on different NP scenarios and investig
ate their effects on the polarization observables. We also discuss in some
detail how the three polarization components of the tau lepton can be mea
sured with the help of its subsequent leptonic and semihadronic decays.
LOCATION:Minkowski room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3772
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pasquale D. Serpico on Unconventional histories o
f the early universe
DTSTART;VALUE=DATE-TIME:20170530T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3799@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Most of cosmology relies on a few measurements at some epochs\
, plus extrapolations using known physics.\nExtrapolations are only safe
if known physics (or some implicitly assumed properties of the unknown on
e) are valid.\nSince we know (notably via some cosmological observations)
that fundamental physics is incomplete\, it is a reasonable expectation t
hat some of these extrapolations may break down. I will illustrate these
general considerations with two (relatively neglected) examples:\nFirst\,
I will show how some features about cosmological events predicted within
the Standard Model (the electroweak and QCD phase transitions) may be alt
ered in a quite minimal BSM extension. Despite its simplicity\, a dramati
cally altered history of the early universe may follow\, even at scales n
aively expected to be under control\, since “the Standard Model rules
”. I will briefly outline some consequences for colliders as well as fo
r cosmology.\nSecond\, I will present CMB bounds on an “unusual” type
of early universe relic\, Primordial Black Holes\, as a part or all of th
e dark matter.\nIn fact\, conceptually their possible formation relies on
the breakdown of the extrapolation of the smallness of primordial perturb
ations down to small scales.\nAlthough they might be seen as a "nightmare
" dark matter candidate\, due to their purely gravitational interactions\
, I will show that this picture is too pessimistic\, and that cosmologica
l constraints and in particular CMB ones cover interesting parts of the p
arameter space.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3799
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Richard Ruiz on Left-Right Symmetry: At the Edges
of Phase Space and Beyond
DTSTART;VALUE=DATE-TIME:20171107T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3856@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Left-Right Symmetric model (LRSM) remains one of the best
motivated ultraviolet completions of the Standard Model of Particle Physic
s. Thus far\, however\, data from the CERN Large Hadron Collider (LHC) tel
l us that new particles\, if they are still accessible\, must be very heav
y and/or very weakly coupled. Interestingly\, these regions of parameter s
pace correspond to collider signatures that are qualitatively and quantita
tively different from those developed in pre-LHC times. We present several
new LRSM collider signatures for these parameter spaces and show a greatl
y expanded discovery potential at the 13 TeV LHC and hypothetical future 1
00 TeV very large hadron collider.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3856
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Giovanni Grilli di Cortona on Constraints on a no
n QCD relaxion model
DTSTART;VALUE=DATE-TIME:20171017T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3857@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss the experimental constraints on strongly intera
cting vector-fermions compatible with the relaxion mechanism and investiga
te any possible tuning. The focus is on a minimal model and low confinemen
t scale. More precisely\, we study bounds from electroweak precision tests
\, Higgs decay\, Big Bang nucleosynthesis and direct collider searches. C
ombining our bounds\, we show that the relaxion mechanism becomes increasi
ngly constrained and fine-tuned as the confinement scale decreases. For ex
ample\, a confinement scale of a few tens of MeVs would require tuning at
the percent level.
LOCATION:Lorentz Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3857
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Astrid Eichhorn on Top mass from Asymptotic Safet
y
DTSTART;VALUE=DATE-TIME:20171024T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3858@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will introduce the key ideas underlying the asymptotic safet
y scenario\, which is mainly explored as a model of quantum gravity and wi
ll review its current status. I will then highlight that it might at the s
ame time provide an ultraviolet completion for the Standard Model of parti
cle physics. First hints indicate that such a setting might even reduce th
e number of free parameters of the Standard Model\, and turn the top mass
as well as the low-energy value of the Abelian gauge coupling into predict
able quantities. Within simple approximations of the Renormalization Group
flow for gravity and matter\, the theoretical values for these quantities
obtained from asymptotic safety lie in the vicinity of the observed value
s.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3858
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ryoutaro Watanabe on The recent anomaly in b -> s
mu mu and possible correlations to other observables.
DTSTART;VALUE=DATE-TIME:20171020T123000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3859@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will show two of my recent works (arXiv:1609.
09078 and arXiv:1702.00395) regarding new physics to accommodate the anoma
ly in b -> s mu mu which has been standing on these days. First\, I will d
iscuss whether or not new physics scenarios can explain the b -> s mu mu a
nomaly and simultaneously the R_D(*) measurement\, which also has a large
deviation from the SM prediction. Second\, I will show some new physics sc
enario that includes a dark matter can explain the b -> s mu mu and the co
smic ray anomalies [AMS anti-proton excess]\, interpreted as dark matter a
nnihilation. The possible explanation is consistent with LHC direct search
es and dark matter direct detection.
LOCATION:Minkowski Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3859
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Prasanna K. Dhani on Threshold resummation of rap
idity distribution for Higgs production at NNLO+NNLL.
DTSTART;VALUE=DATE-TIME:20171102T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3871@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:With the increasing accurate measurements of various observabl
es at the Large Hadron Collider\, precise theoretical predictions are of p
aramount importance which will help not only to understand Standard Model
better but also to constrain various observables beyond the SM scenarios.
The inclusive production of colorless particles\, as in Drell-Yan process
and the Higgs production in the final state has been studied both in fixed
order as well as in resummed frameworks. The perturbative predictions for
differential observables like rapidity\, transverse momentum are underway
. In my talk\, I will present our recent work on resummation of rapidity
distributions for the Higgs production via gluon fusion.\nWe provide an al
l order prediction for the resummed cross section in two dimensional Melli
n space.\nWe find significant reduction in scale uncertainties due to unph
ysical scales at NNLO + NNLL.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3871
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Amit Sever on Universal Correction To The Venezia
no Amplitude
DTSTART;VALUE=DATE-TIME:20171121T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3877@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the talk I will consider theories of weakly interacting hig
her spin particles in flat spacetime.\nWe will focus on the four-point sca
ttering amplitude at high energies and imaginary scattering angles. Both\,
the leading asymptotic of the amplitude and the first sub-leading correct
ion in this regime turn out to be universal. Using bootstrap techniques\,
we will argue that the leading asymptotic is equal to the corresponding li
mit of the Veneziano amplitude. We will compute the first sub-leading corr
ection using a model of relativistic strings with massive endpoints and ar
gue that it is unique using holography\, the effective theory of long stri
ngs and bootstrap techniques.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3877
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Hendrik Vogel on Diffuse axion-like particle sear
ches
DTSTART;VALUE=DATE-TIME:20171205T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3878@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The detection of high-energy astrophysical neutrinos by IceCub
e implies production of high-energy photons in the same sources. I present
a new technique that uses this photon flux to search for a diffuse axion-
like particle (ALP) background. These photons may convert into ALPs in the
sources’ magnetic fields\, and will travel as ALPs through extragalacti
c space. Back-conversion in the Milky Way’s magnetic field leads to a di
ffuse anisotropic high-energy photon flux that existing and upcoming gamma
-ray detectors\, like HAWC\, CTA\, and LHAASO can detect. I show that LHAA
SO will be realistically sensitive to couplings above 10^−11 GeV−1 and
masses up to 3 × 10^−6 eV in ten years\, thereby probing even viable d
ark matter parameter space.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3878
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ilaria Brivio on Shedding light on new physics wi
th Effective Field Theories
DTSTART;VALUE=DATE-TIME:20171114T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3912@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Effective Field Theories (EFTs) are a powerful tool for invest
igating the presence of new physics beyond the Standard Model. We will fir
st consider the Standard Model Effective Field Theory and discuss\, in a
“bottom-up” approach\, how its parameters can be constrained with glob
al fit analyses without making assumptions on the UV physics.\nAs a case s
tudy I will present the results of a fit to electroweak data. The latter e
xhibits instructive features\, among which the presence of two combination
s of Wilson coefficients that remain unconstrained when the analysis is re
stricted to 2 -> 2 scattering processes and whose origin can be understood
in terms of a reparameterization invariance.\nThe second part of the talk
will follow a “top-down” perspective: considering the type-I seesaw m
odel for neutrino masses\, EFT techniques will be employed to discuss the
possibility that the Higgs potential and electroweak scale are generated r
adiatively in this scenario. This framework represents an alternative appr
oach to the hierarchy problem: here the Higgs mass is not stabilized aroun
d the TeV scale\, but rather determined by radiative corrections at higher
energies.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3912
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ian Moult on Subleading Power Corrections for N-J
ettiness Subtractions
DTSTART;VALUE=DATE-TIME:20171128T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3928@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The behavior of amplitudes and cross sections in the soft and
collinear limits has played an essential role in our understanding of pert
urbative calculations in gauge theories. While often studied at leading po
wer in the soft or collinear expansion\, the structure of power correction
s is of both formal and phenomenological interest. In this talk I will sho
w how techniques from effective field theory can be used to systematically
study subleading power corrections\, and subleading power factorization.
As an application\, I will use these techniques to analytically compute t
he dominant power corrections for NNLO subtraction schemes based on physic
al resolution variables\, in particular N-jettiness. I will discuss in det
ail the case of Drell-Yan like color singlet production\, and show how the
analytic calculation of the leading power corrections\, and an improved d
efinition of the observable\, each lead to an order of magnitude improveme
nt of the subtractions.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3928
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gero von Gersdorff on Natural Fermion Hierarchies
from Random Yukawa Couplings
DTSTART;VALUE=DATE-TIME:20171215T123000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3945@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Standard Model of particle physics requires Yukawa matrice
s with eigenvalues that differ by orders of magnitude. We propose a novel
way to explain this fact without any small or large parameters. The mechan
ism is based on the observation that products of matrices of random order
one-numbers have hierarchical spectra. The same mechanism also accounts fo
r the hierarchical structure of the quark mixing matrix.
LOCATION:Minkowski Raum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3945
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Felix Kling on FASER: ForwArd Search ExpeRiment a
t the LHC
DTSTART;VALUE=DATE-TIME:20171219T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3946@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:New physics has traditionally been expected in the high-pT reg
ion at high-energy collider experiments. If new particles are light and we
akly-coupled\, however\, this focus may be completely misguided: light par
ticles are typically highly concentrated within a few mrad of the beam lin
e\, allowing sensitive searches with small detectors\, and even extremely
weakly-coupled particles may be produced in large numbers there. We propos
e a new experiment\, ForwArd Search ExpeRiment\, or FASER\, which would be
placed downstream of the ATLAS or CMS interaction point in the very forwa
rd region and operated concurrently there. As a concrete example of light\
, weakly-coupled particles\, we consider dark photons\, dark Higgs bosons\
, ALPs and sterile neutrinos. We find that even a relatively small and ine
xpensive cylindrical detector can discover such particles in a large and u
nprobed region of parameter space.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3946
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Mark Goodsell on The Higgs mass and infra-red cat
astrophes
DTSTART;VALUE=DATE-TIME:20180109T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3947@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In theories defined by high-energy boundary conditions (such a
s supersymmetry)\, the Higgs mass is a prediction. On the other hand\, in
the Standard Model\, it is an input\, that we need to use to calculate the
Higgs quartic coupling\, to predict the cubic coupling and also to test f
or vacuum stability. However\, since the Higgs is a scalar\, its mass is v
ery sensitive to those of other particles such as the top quark -- or any
new physics (hence we have a hierarchy problem) but this also means that w
e need to calculate as many loop corrections as we can in order to obtain
accurate results. Once we reach two loops\, however\, we find a technical
"Catastrophe" associated with the would-be Goldstone Bosons of the W and Z
bosons: in Landau gauge their masses vanish\, and this leads to infra-red
divergences in the amplitudes. I will show how this problem can be avoide
d for general renormalisable field theories\, with applications in the Sta
ndard Model and several popular extensions (such as the NMSSM)\, and descr
ibe how the results have been implemented in the public code SARAH. \nOn t
he other hand\, when we consider that the scale of new physics might be hi
gh\, we need a method of making predictions for the Higgs mass (or predict
ions for the properties of the high-energy theory`s stability) using the S
tandard Model as an effective field theory.\nThese calculations are beset
by a similar but worse infra-red problem\, in that the infra-red divergenc
es appear already at one-loop order. I will briefly describe some work in
progress to show the relation between the two problems and how to solve th
e latter\, so far at one-loop order.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3947
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kfir Blum on Cosmic-ray antimatter\, and what we
can learn from it
DTSTART;VALUE=DATE-TIME:20180116T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3948@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Over the last decade space-borne experiments have delivered ne
w measurements of cosmic-ray (CR) antiprotons and positrons. Where does th
is antimatter come from? Does it contain evidence for new physics\, or exo
tic astrophysical phenomena? What does it teach us about high-energy proce
sses in the Galaxy? I will describe an attempt to understand cosmic-ray an
timatter from first-principles\, derive key lessons for astrophysics\, and
highlight open questions. To conclude I will show how analyses of cosmic-
ray composite antinuclei — anti-helium and anti-deuterium — connect to
very recent progress at the LHC and to basic questions of coalescence and
flow in high multiplicity hadronic collisions.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3948
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fabian Ruehle on Exploring string theory solution
s with machine learning
DTSTART;VALUE=DATE-TIME:20180123T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3949@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We will start with a pedagogical introduction to machine learn
ing with particular emphasis on the subfield of reinforcement learning. Su
bsequently\, we discuss how to apply reinforcement learning to the study o
f a particular class of string theory solutions\, so-called Type II inters
ecting brane worlds. We explain the physical consistency conditions that a
rise in these constructions\, without assuming any prior string theory kno
wledge. We end by mapping this set of string theory consistency constraint
s onto an environment that can be analyzed with reinforcement learning and
present some preliminary results of the AI exploration of this corner of
the string theory landscape.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3949
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Harald Ita on Planar Two-Loop Five-Gluon Amplitud
es from Numerical Unitarity
DTSTART;VALUE=DATE-TIME:20180130T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3950@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A recent calculation of the planar two-loop five-gluon amplitu
des will be discussed.\nThe amplitudes are obtained in a variant of the ge
neralized unitarity approach suitable for numerical computations. Given th
e available master integrals arbitrary-precision benchmark values for the
amplitudes have been given.\nSome of the technical aspects of the approach
are addressed in more detail including e.g.\nthe construction of unitarit
y-compatible integration-by-parts identities.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3950
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kasper Larsen on Differential equations for loop
integrals without squared propagators
DTSTART;VALUE=DATE-TIME:20180206T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3951@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A powerful approach to compute multi-loop Feynman integrals is
to reduce the integrals to a basis of integrals and set up a first-order
linear system of partial differential equations for the basis integrals. I
n this talk I will discuss the differential equations that arise when the
loop integrals are parametrized in Baikov representation. In particular\,
I give a proof that dimension shifts (which are undesirable) can always be
avoided.\nI will moreover show that in a large class of two- and three-lo
op diagrams it is possible to avoid integrals with squared propagators in
the intermediate stages of setting up the differential equations. This is
interesting because it implies that the differential equations can be set
up using a smaller set of reductions.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3951
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Zahra Khajeh Tabrizi on Physics beyond oscillatio
n at DUNE
DTSTART;VALUE=DATE-TIME:20100220T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3974@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The DUNE near detector would offer not only the requisite syst
ematic precision for oscillation studies\, but also a generational advance
in the precision measurements and unique searches that a neutrino beam ca
n provide. We use neutrino trident events as a way to probe new physics at
DUNE. We also use elastic neutrino scattering on electrons as a way to ex
tract the uncertainty of the weak mixing angle. Moreover\, we use the trid
ent production\, elastic neutrino scattering on electrons and neutrino sca
ttering on nuclei as a way to constrain the operators in the Standard Mode
l Effective Field Theory (SMEFT).
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3974
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Zahra Khajeh Tabrizi on Physics beyond oscillatio
n at DUNE
DTSTART;VALUE=DATE-TIME:20180220T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:3975@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The DUNE near detector would offer not only the requisite syst
ematic precision for oscillation studies\, but also a generational advance
in the precision measurements and unique searches that a neutrino beam ca
n provide. We use neutrino trident events as a way to probe new physics at
DUNE. We also use elastic neutrino scattering on electrons as a way to ex
tract the uncertainty of the weak mixing angle. Moreover\, we use the trid
ent production\, elastic neutrino scattering on electrons and neutrino sca
ttering on nuclei as a way to constrain the operators in the Standard Mode
l Effective Field Theory (SMEFT).
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/3975
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jakub Scholtz on Charged Dark Matter
DTSTART;VALUE=DATE-TIME:20180424T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4026@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We revisit constraints on dark matter that is charged under a
U(1) gauge group in the dark sector\, decoupled from Standard Model forces
. We find that the strongest constraints in the literature are subject to
a number of mitigating factors. For instance\, the naive dark matter therm
alization timescale in halos is corrected by saturation effects that slow
down isotropization for modest ellipticities. The weakened bounds uncover
interesting parameter space\, making models with weak-scale charged dark m
atter viable\, even with electromagnetic strength interaction. This also l
eads to the intriguing possibility that dark matter self-interactions with
in small dwarf galaxies are extremely large\, a relatively unexplored regi
me in current simulations. Such strong interactions suppress heat transfer
over scales larger than the dark matter mean free path\, inducing a dynam
ical cutoff length scale above which the system appears to have only feebl
e interactions. These effects must be taken into account to assess the via
bility of darkly-charged dark matter. Future analyses and measurements sho
uld probe a promising region of parameter space for this model.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4026
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Yunfeng Jiang on Bethe ansatz and algebraic geome
try
DTSTART;VALUE=DATE-TIME:20180508T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4027@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will discuss how to apply methods of modern c
omputational algebraic geometry to Bethe ansatz. I will show that algebrai
c geometry provides natural mathematical languages and powerful tools to u
nderstand the structure of solutions of Bethe ansatz equations (BAE). In p
articular\, I will present new methods to count the number of physical sol
utions with fixed quantum numbers based on Gröbner basis and quotient rin
g. This method can be applied to study the completeness of Bethe ansatz. I
will also discuss an analytical method to compute the sum of on-shell phy
sical quantities over all physical solutions without explicitly solving BA
E. This method has important applications in calculating the sum rules of
OPE coefficients in N=4 super-Yang-Mills theory.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4027
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christoph Englert on Effective Higgs Phenomenolog
y at the LHC and beyond
DTSTART;VALUE=DATE-TIME:20180515T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4028@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:While the Higgs and top quark phenomenology programmes are wel
l underway\, direct signs for new physics beyond the Standard Model remain
elusive. In this talk\, I will discuss the implications of recent LHC Hig
gs measurements and how differential distributions will improve the sensit
ivity to new interactions beyond the Standard Model in the light of expect
ed uncertainties. Special attention will be devoted to the particular case
of multi-Higgs production as a direct probe of the Higgs boson’s self-i
nteractions. While the expected sensitivity to this parameter is expected
to be low at the LHC\, it provides a key motivation for a potential future
100 TeV collider.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4028
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Schmidt on Hunting the ghost in our Unive
rse - the quest for particle dark matter
DTSTART;VALUE=DATE-TIME:20180529T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4029@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Particle dark matter is the simplest explanation for the missi
ng mass in our Universe. I will focus on weakly interacting massive partic
les (WIMPs) which are theoretically well motivated. Despite tremendous exp
erimental effort\, so far there is no solid evidence in (in)direct detecti
on experiments or at the LHC. This indicates that the scattering cross sec
tion of dark matter with Standard Model particles may be smaller than naiv
ely assumed. I will discuss two aspects related to this: (i) the possibili
ty that dark matter does not directly couple to quarks and consequently di
rect detection only occurs at loop level\; (ii) regions of parameter space
\, which are naively ruled out\, because dark matter is overabundant\, may
be allowed if there is a phase in the early Universe during which dark ma
tter is unstable.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4029
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Nayara Fonseca on Electroweak Naturalness: the re
laxing way
DTSTART;VALUE=DATE-TIME:20180605T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4030@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The relaxion models propose a new idea to explain the smallnes
s of the Higgs mass. They rely on the scanning of the Higgs mass parameter
by a new field\, the relaxion\, and a back-reaction mechanism that is tri
ggered when the Higgs vacuum expectation value has reached the size of the
electroweak scale\, making the relaxion evolution cease. In the usual rel
axion model the scanning happens during an inflationary period. Here we ex
plore the cosmological consequences if the relaxation happens independentl
y of inflation. In this scenario\, the stopping mechanism is provided by p
article production. The stopping barriers of the periodic potential are la
rge and Higgs-independent\, which facilitates the model-building and can m
ake the relaxion heavier than in the usual case.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4030
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Dhritiman Nandan on New structures in the perturb
ative S-matrix of Einstein-Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20180612T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4031@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will discuss recent developments in the study o
f scattering amplitudes in Einstein-Yang-Mills Theory. I will present nove
l relations between tree-level amplitudes in this theory and YM theory. Fi
nally\, I will discuss unitarity based observations regarding rational one
-loop amplitudes involving gluons and gravitons.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4031
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jonathan Gaunt on Factorisation in Colour Singlet
Production
DTSTART;VALUE=DATE-TIME:20180626T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4032@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We rely heavily on factorisation formulae to make useful predi
ctions at colliders such as the LHC. But when do such formulae work\, and
why? When do they not work? I will discuss this issue in the context of th
e production of a colour singlet V at hadronic colliders. Observables disc
ussed include the total cross section for the production of V\, p_T of V (
including spin-dependent observables)\, and hadronic transverse energy E_T
accompanying V. Based on arXiv:1405.2080 and arXiv:1709.04935.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4032
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthias Neubert on Effective Field Theory after
a New-Physics Discovery
DTSTART;VALUE=DATE-TIME:20180703T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4075@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:When a new heavy particle is discovered at the LHC\, it will b
e interesting to study its decays into Standard Model particles using an e
ffective field-theory framework. We point out that the proper effective th
eory can not be constructed as an expansion in local\, higher-dimensional
operators\; rather\, it must be based on non-local operators defined in so
ft-collinear effective theory (SCET). For the interesting case where the n
ew resonance is a gauge-singlet spin-0 boson\, which is the first member o
f a new sector governed by a mass scale M\, we show how a consistent scale
separation between M and the electroweak scale v is achieved up to next-t
o-next-to-leading order in the expansion parameter λ∼v/M. The Wilson co
efficients in the effective Lagrangian depend in a non-trivial way on the
mass of the new resonance and the masses of yet undiscovered heavy particl
es. Large logarithms of the ratio M/v can be systematically resummed using
the renormalization group. We develop a SCET toolbox\, with which it is s
traightforward to construct the relevant effective Lagrangians for new hea
vy particles with other charges and spin.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4075
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anirban Karan on T and CPT violation in \\(B^0-\\
bar{B}^0\\) mixing
DTSTART;VALUE=DATE-TIME:20180925T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4137@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:CPT invariance is believed to be a sacred symmetry of nature a
s well as quantum field theory (QFT). Therefore\, it is very important to
test the validity of this assumption experimentally. Though all the experi
mental data is consistent with CPT conservation\, improvement in statistic
s is expected in LHCb and Belle II. But LHCb cannot use the usual method o
f measuring CPT violation through entangled B 0 − B̄ 0 states and a new
technique is required. We found that the time-dependent\, indirect CP asy
mmetry (A fCP/CP T ) involving B decays to CP eigenstate contains enough i
nformation to measure T and CPT violation in B 0 − B̄ 0 mixing\, in add
ition to the standard CP-violating weak phases. The advantages of this met
hod are following:\n1. Entangled B 0 − B̄ 0 states are not required (so
that this analysis can be carried out at LHCb\, as well as at the B facto
ries)\, 2. Penguin pollution need not be neglected.\n3. This approach can
be used in both B d 0 and B s 0 systems.\n4. A similar approach can be use
d for B decaying to two vectors too.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4137
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Florian Goertz on All Scalars from one Source: Ax
iflavon-Higgs Unification
DTSTART;VALUE=DATE-TIME:20181016T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4141@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I discuss a unified model of scalar particles that addresses t
he flavour hierarchies\, solves the strong CP problem\, delivers a dark ma
tter candidate\, and provides the trigger for electroweak symmetry breakin
g. Besides furnishing a unification of the recently proposed axiflavon wit
h a Goldstone-Higgs sector\, the scenario can also be seen as adding a mod
el of flavour to elementary Goldstone-Higgs setups.\nIncluding constraints
from flavour physics\, we find that the model is very predictive\, restri
cting the axion decay constant to a thin stripe of f_a ~ (10^11−10^12) G
eV in the minimal implementation.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4141
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Mikhail Gorshteyn on Reduced hadronic uncertainty
in V_{ud} and first-row CKM unitarity.
DTSTART;VALUE=DATE-TIME:20181023T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4156@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Radiative corrections to neutron beta-decay have been fundamen
tal for establishing the electroweak model. Universality of the weak inte
raction and conservation of vector current lead to the requirement of uni
tarity of the CKM mixing matrix. Unitarity in the first row\, |V_{ud}|^2+|
V_{us}|^2+|V_{ub}|^2=1 belongs to the most stringent tests of the Standard
Model and beyond. Current PDG value is in good agreement with unitarity\
, |V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2=0.9994 +- 0.0005\, and the central valu
e and the uncertainty are dominated by those due to the upper-left corner
element |V_{ud}|=0.97420(10)_{exp}(18)_{th}\, which is obtained from ana
lysis of superallowed nuclear decays. The uncertainty of V_{ud} is dominat
ed by the theoretical uncertainty related to the gamma-W-box diagram whic
h depends on hadronic and nuclear structure. The hadronic part has been a
ddressed by Marciano and Sirlin\, while the nuclear part by Towner and Ha
rdy. To test previous analyses\, we applied dispersion relations to the ca
lculation of the gamma-W-box correction\, and used data on neutrino and a
ntineutrino scattering to better constrain the input in the dispersion in
tegral. We were able to reduce the hadronic uncertainty by almost a factor
2\, |V_{ud}|=0.97366(10)_{exp}(11)_{th}. However\, the central value shi
fted considerably\, raising tension with unitarity\, |V_{ud}|^2+|V_{us}|^
2+|V_{ub}|^2=0.9984 +- 0.0004. Ongoing work is concentrated on proposing
new measurements with polarized electrons and neutrinos to test our new an
alysis in a more direct and model-independent way\, and on reevaluating t
he nuclear structure corrections within the dispersive framework.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4156
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Da Huang on Electroweak Baryogenesis and Dark Mat
ter from a Complex Singlet Scalar
DTSTART;VALUE=DATE-TIME:20181030T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4164@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We connect the electroweak (EW) baryogenesis and the dark matt
er physics in a complex singlet scalar S extension of the Standard Model.\
nWe impose the additional CP and Z_2 symmetries on the scalar potential. W
ith the complex vacuum expectation value of S at the temperature higher th
an the EW phase transition\, the CP symmetry is spontaneously broken and a
strong first-order EW phase transition is easily realized. Together with
a dimension-6 effective operator that gives new complex contributions to t
he top quark mass\, we show that it is easy to yield the observed baryon a
symmetry in our Universe. On the other hand\, the CP and Z_2 symmetries ar
e recovered after the EW phase transition. The lighter real state in S can
be the dark matter candidate\, and the strong constraints of CP violation
s can be avoided.\nWith the scan of parameter space\, we can find models w
hich can explain the dark matter relic abundance and the baryon asymmetry
simultaneously while satisfying all constraints.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4164
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gabor Somogyi on CoLoRFulNNLO: developments and a
pplications
DTSTART;VALUE=DATE-TIME:20181106T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4167@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The excellent performance of the LHC experiments and the wealt
h of precise data they deliver requires that the challenge of high precis
ion also be addressed in the theory calculations used to describe the mea
surements. One aspect of theoretical precision is related to the computat
ion of exact higher order corrections to physical observables in QCD pert
urbation theory. As the mass production of two-loop amplitudes is becomin
g a reality\, frameworks and tools to organize computations at next-to-ne
xt-to-leading order (NNLO) accuracy must also be developed. In the talk I
will present the CoLoRFulNNLO method for calculating fully differential
predictions at NNLO in QCD. After addressing the key conceptual issues wh
ich arise in the construction of the method\, I will discuss the status of
extending the scheme to deal with initial state radiation\, pointing out
some technical issues specific to this approach which must be addressed.
I will also show some applications of the CoLoRFulNNLO framework\, in pa
rticular\, I will discuss a new measurement of the strong coupling from m
easurements of energy-energy correlation in electron-positron collisions\
, as well as a full NNLO computation of the associated production of a Hi
ggs boson decaying into bottom quarks at the LHC.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4167
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tilman Plehn on The Rise of the Tagging Machines
DTSTART;VALUE=DATE-TIME:20181109T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4170@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Machine Learning techniques have been used at the LHC for a lo
ng time. Jet sub-structure has become an especially active field to test
new ideas in this direction. I will discuss how jet sub-stucture has bec
ome an established concept in the last decade and in which sense machine l
earning is the next logical step in this field. Specifially\, top tagging
has many applications in searches for physics beyond the Standard Model.
It allows us to to test different approaches\, benchmark new architectur
es and tools\, understand how deep learning tools actually work\, and ill
ustrate the conceptual progress we can expect in jet analyses in the comi
ng years.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4170
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pablo Quilez on Heavy (dynamical) axions
DTSTART;VALUE=DATE-TIME:20181113T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4191@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will review recent attempts to build heavy axion models whic
h solve the strong CP problem while enlarging the parameter space well bey
ond that of invisible axion models. I will also discuss new theoretical an
d phenomenological results on the axion and ALP parameter space axion cou
plings to photons\, Z and W bosons. Next\, I will present a recent model
of heavy axions: the first axion model solving the strong CP problem with
colour unification and massless fermions. The axion scale may be not far f
rom the TeV region which translates to observable signals at colliders.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4191
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jiayin Gu on Probing the Higgs couplings and self
-coupling at future lepton colliders in the EFT framework
DTSTART;VALUE=DATE-TIME:20181120T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4192@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We study the reach on the Higgs coupling constraints at future
lepton colliders in a global effective-field-theory framework. The impac
t and complementarity of different measurements\, at different center-of-m
ass energies and for several beam polarization configurations\, are discus
sed in detail. We also study the sensitivities to the Higgs self-coupling
at future lepton colliders under this framework.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4192
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Luc Darme on Hunting light dark sectors at collid
ers and fixed target experiments
DTSTART;VALUE=DATE-TIME:20181127T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4197@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Minimal self-consistent scenarios with light (sub-GeV) dark ma
tter are usually accompanied by a correspondingly light "dark sector". The
presence of the latter leads to bright detection prospects at fixed targe
t experiments and colliders and potentially strong astrophysical bounds. W
e will illustrate this point by exploring explicitly a typical simple ferm
ion dark matter setup\, showing in particular that the presence of an ofte
n long-lived dark Higgs boson is a key element of the phenomenology.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4197
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Javi Serra on Phenomenological Consequences of Th
eoretical Constraints on EFTs
DTSTART;VALUE=DATE-TIME:20181204T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4201@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The unitarity\, analyticity and Poincare invariance of a micro
scopic theory’s S-matrix leaves its imprints at low energies as constrai
nts on the Wilson coefficients of the resulting effective field theory (EF
T). In this talk I will discuss the implications of such bounds on various
EFTs in particle physics and cosmology\, including strongly coupled fermi
ons and vectors\, massive gravity\, and higher-spin theories.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4201
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Wouter Waalewijn on Electroweak logarithms in inc
lusive cross sections
DTSTART;VALUE=DATE-TIME:20181211T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4202@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Electroweak corrections are important for BSM searches\, as th
ey can modify the tails of distributions. I will present a framework to re
sum electroweak logarithms in inclusive processes\, that enables resummati
on beyond leading logarithmic accuracy. Interestingly\, this is not simply
achieved by the electroweak evolution of PDFs and fragmentation functions
\, but also involves soft functions. This introduces a dependence on angle
s and leads to mixing. I will also discuss a few extensions\, including je
ts\, and discuss the electroweak gauge boson PDFs.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4202
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Julian Munoz on Searching for Dark Matter at the
Cosmic Dawn
DTSTART;VALUE=DATE-TIME:20181218T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4203@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The nature of the dark matter is still a mystery\, although cu
rrent and upcoming 21-cm measurements during the cosmic dawn can provide a
new arena on the search for the cosmological dark matter. This era saw th
e formation of the first stars\, which coupled the spin temperature of hyd
rogen to its kinetic temperature---producing 21-cm absorption in the CMB.
The strength of this absorption acts as a thermostat\, showing us if the b
aryons have been cooled down or heated up by different processes. I will s
how the discovery space for new dark-sector interactions\, focusing on the
case of "minicharged" dark-matter\, which can explain the anomalous 21-cm
depth observed by the EDGES collaboration.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4203
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Eleni Vryonidou on Precision in effective field t
heory studies for top quark and Higgs physics
DTSTART;VALUE=DATE-TIME:20190108T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4204@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I review recent progress in the computation of pr
ocesses involving top quarks in the framework of Standard Model Effective
Theory including NLO QCD corrections. In particular I will discuss the imp
act of QCD corrections for various top production channels and the importa
nce of using these results in a global EFT fit in the top sector. Results
for Higgs production in processes involving top quark loops will also be d
iscussed.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4204
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kim Berghaus on Decays of Long-Lived Relics and T
heir Signatures at IceCube
DTSTART;VALUE=DATE-TIME:20181221T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4211@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The 5.6 sigma high-energy neutrino excess at the IceCube detec
tor could be an indicator of physics beyond the standard model. I will dis
cuss the scenario of long-lived relics decays\, with lifetimes shorter tha
n the age of the universe\, sourcing the neutrino excess . I will show the
constraints on this possibility that arise from light element abundances\
, CMB anisotropies\, and diffuse gamma-ray spectra. I will also discuss th
e importance of including electroweak corrections when exploring new physi
cs far beyond the electroweak scale.
LOCATION:THEP social room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4211
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthias Jamin on QCD correlators at higher order
s
DTSTART;VALUE=DATE-TIME:20190115T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4212@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Estimating uncertainties for perturbative predictions in QCD o
ften hinges on our knowledge of higher-order corrections. Different approa
ches are available to achieve this goal like the study of scale and scheme
variations\, as well as investigating the general renormalon structure. T
hose approaches are exemplified for the case of QCD two-point correlation
functions. In order to study scheme variations\, it proves useful to intro
duce a particular scheme\, the so-called C-scheme\, in which the QCD beta-
function is manifestly scheme invariant and known to all orders. On the ot
her hand\, the renormalon structure of QCD correlators can provide importa
nt insight into the general behaviour of their perturbative series. This g
eneral behaviour also suggests the existence of a scheme-invariant couplin
g in full QCD which will be introduced and its implications discussed.
LOCATION:Gernot-Graeff room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4212
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tim Stefaniak on BSM Higgs Sectors at the LHC: to
ols\, benchmarks and signatures
DTSTART;VALUE=DATE-TIME:20190129T153000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4213@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Given the experimental confirmation of the Standard Model (SM)
predictions for the discovered Higgs boson as well as the non-observation
of signals for beyond-the-Standard Model (BSM) physics in Run-1 and Run-2
of the Large Hadron Collider (LHC)\, I shall discuss the implications for
BSM Higgs models and highlight possible new signatures and search strateg
ies for future LHC runs. After introducing the public tools HiggsBounds an
d HiggsSignals --- designed to confront BSM models with the experimental r
esults --- I will focus on the Minimal Supersymmetric Standard Model (MSSM
) and present a new set of benchmark scenarios specificly designed for upc
oming BSM Higgs searches at the LHC. I shall conclude with a brief outlook
on the LHC sensitivity in the high-luminosity phase.
LOCATION:MITP room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4213
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andre Hoang on What is the top quark mass?
DTSTART;VALUE=DATE-TIME:20190205T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4214@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The current controversial discussions concerning the interpret
ation of the top quark mass measurements from experimental reconstruction
analyses at the LHC expresses the fact that the theory calculations (analy
tic or Monte Carlo) are\, as far as the available theoretical precision is
concerned\, somewhat behind the current experimental precision. The cont
roversy thus arises because the current theory uncertainties are judged di
fferently by different theorists (but also experimentalists)\, which is a
consequence of the fact that there is no universal way to estimate theore
tical errors. The discussions should be seen as a motivation to push theo
ry (but at the same time also experiments) further toward a better underst
anding concerning issues that have up to now not received much attention\
, mostly concerning soft gluon radiation and its interplay with electrowea
k effects mostly related to top quark decay. In this respect the top quark
mass measurement problem is very special and complicated\, particularly
at the LHC\, and will require a number of new conceptual developments. \nI
n the talk I provide my view on the current status of the issue what the t
op quark mass is and recent results that approach the problem for the fir
st time in a systematic and analytical way by a perturbative analysis of
angular ordered parton showers.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4214
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Laura Sagunski on TBA
DTSTART;VALUE=DATE-TIME:20190212T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4215@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:TBA
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4215
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Bogumila Swiezewska on Testing conformal symmetry
with gravitational-wave detectors
DTSTART;VALUE=DATE-TIME:20190122T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4217@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk the electroweak and conformal symmetry-breaking p
hase transition is considered within the SU(2)cSM model. It consists of th
e conformal standard model extended by a new gauge SU(2) group and a scala
r field that is a doublet under this new symmetry. The two sectors communi
cate through a Higgs portal coupling. I will explain how the phase transit
ion proceeds and show that it is very strong due to large super-cooling. I
will present estimates of the gravitational-wave signal and show that it
generically falls into the LISA sensitivity region. If time permits\, I wi
ll also discuss potential pitfalls and relevant points for improvement req
uired to attain reliable estimates of the gravitational wave production.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4217
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Claudius Krause on Higgs Effective Field Theories
and their Renormalization
DTSTART;VALUE=DATE-TIME:20190507T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4228@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:With no direct observation of physics beyond the Standard Mode
l (SM) at the LHC\, bottom-up Effective Field Theories (EFTs)\, especially
in the newly-established Higgs sector\, have become popular in the past y
ears. Depending on the assumptions on the Higgs-like scalar\, two differen
t EFTs can be constructed: The Standard Model EFT (SMEFT) that assumes the
Higgs is part of an SU(2) doublet\; and the Electroweak Chiral Lagrangian
(EWChL) that treats the Higgs scalar as independent singlet.\nIn the firs
t part of my talk\, I will discuss the assumptions underlying these two EF
Ts and the different power counting schemes that arise within them.\nIn th
e second part\, I will derive a master formula for the complete one-loop r
enormalization of a generic Lagrangian employing background-field method a
nd super-heat-kernel expansion. Then\, I will apply the formula to the two
Higgs EFTs and discuss the results.
LOCATION:THEP Sozialraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4228
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Victor Martin-Lozano on Are the neutrinos driving
the SM to the Swampland? and other Weak Gravity Conjecture tales
DTSTART;VALUE=DATE-TIME:20190208T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4229@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:It is known that not every effective field theory could be emb
edded in quantum gravity\, but only those which are consistent with the QG
conjectures. Does these constraints have an impact in low energy physics?
Recently\, Ooguri and Vafa argued using a strong approach of the Weak Gra
vity Conjecture that non-supersymmetric stable AdS vacua are incompatible
with quantum gravity. It is also known that compactifying the Standard Mod
el to 3 or 2 dimensions can give rise to AdS vacua. Using the fact that th
ose vacua must be absent\, several constraints are set on the SM and BSM p
articles\, obtaining a lower bound on the cosmological constant in terms o
f the masses of the neutrinos. Moving forward one can translate those into
an upper bound for the EW scale around the TeV range.
LOCATION:THEP Social Room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4229
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Zoltan Trocsanyi on Super weak force and neutrino
masses
DTSTART;VALUE=DATE-TIME:20190416T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4274@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We consider an anomaly free extension of the standard model ga
uge group G by an abelian group to GxU(1)Z. The condition of anomaly cance
llation is known to fix the Z-charges of the particles\, but two. We fix o
ne remaining charge by allowing for all possible Yukawa interactions of th
e known left handed neutrinos and new right-handed ones that obtain their
masses through interaction with a new scalar field with spontaneously brok
en vacuum. We discuss some of the possible consequences of the model. Ass
uming that the new interaction is responsible for the observed differences
between the standard model prediction for the anomalous magnetic moment o
f the muon or anti-muon and their measured values\, we predict the size of
the vacuum expectation value of the new scalar field.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4274
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Brian Henning on Listening to spacetime
DTSTART;VALUE=DATE-TIME:20190423T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4279@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Common to every theoryfundamental\, phenomenological\, or even
toyis a notion of degrees of freedom living on some space(time). While at
first glance such a statement may sound so broad as to render it meaningl
ess\, it actually imposes quite a strong structure. The basic point is tha
t the degrees of freedom allow for certain types of measurements (scatteri
ng\, correlation functions\, etc.)\, and that these measurements can only
take values consistent with the relevant spacetime symmetry. Turning this
around\, we can use spacetime symmetry to parameterize the kinematics of e
xperiments\, thereby allowing a clearer way to study the dynamics.\n\n\nIn
this talk I will show that this is precisely what effective field theory
(EFT) does. Viewing EFT through the lens of spacetime symmetry unveils pre
viously unnoticed structures. For example\, in an N particle phase space o
f massless particles we will find a certain U(N) actiongeneralizing the U(
1)N little group scaling of the particleswhose harmonic decomposition also
gives a harmonic decomposition of the spacetime symmetry group (in this c
ase\, the conformal group). This provides a basis not only for an EFT\, bu
t also a basis for the Hilbert space of free theories. As I will explain\,
the latter is an essential ingredient in the recently revived technique o
f Hamiltonian truncation to numerically study quantum field theories.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4279
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Daniel G. Figueroa on Inconsistency of an inflati
onary sector coupled only (minimally) to gravity
DTSTART;VALUE=DATE-TIME:20190430T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4298@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The inflationary sector might very well have no direct couplin
gs to other species\, apart from inevitable gravitational interactions. In
the context of General Relativity\, a thermal universe can still emerge a
fter inflation if i) a radiation sector is excited towards the end of infl
ation\, and ii) the equation of state after inflation becomes sufficiently
stiff w >> 1/3. In such circumstances\, the inflationary background of gr
avitational waves (GWs) is significantly enhanced\, making this signal (po
tentially) observable by GW detectors. I will discuss first how LISA & LIG
O could measure this signal\, probing in this way the expansion rate of th
e early Universe. Secondly\, I will show that the very same enhancement of
the GW signal leads however to an inconsistency of the scenario\, violati
ng standard bounds on stochastic backgrounds of GWs. Finally\, I will show
that the very existence of the Standard Model Higgs can actually save the
day\, by simply demanding the Higgs to be non-minimally coupled to gravit
y.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4298
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Aleksandrs Aleksejevs on Dispersive Techniques fo
r Two-Loop Calculations
DTSTART;VALUE=DATE-TIME:20190521T120000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4299@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:As the new generation of precision experiments aims to search
for physics beyond the Standard Model\, it becomes increasingly important
to evaluate the relevant higher-order corrections. In collaboration with M
OLLER and P2\, we work to address the full set of two-loop electroweak rad
iative corrections to electron-electron and electron-proton scattering cro
ss sections and asymmetries. In this presentation\, we will describe the r
ecent developments in dispersive sub-loop insertion approach in two-loop c
alculations\, which would allow partial automatization.
LOCATION:Social Room (05-427)\, Staudingerweg 7
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4299
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fang Ye on Cosmological relaxation from dark ferm
ion production
DTSTART;VALUE=DATE-TIME:20190503T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4300@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Cosmological relaxation of the electroweak scale proposed by G
raham\, Kaplan and Rajendran (GKR) arises as a solution to the naturalness
problem. However\, certain downsides exist in the original GKR scenario w
hich relies on the Hubble expansion to dissipate the relaxion energy\, suc
h as the extremely small parameters and large e-foldings. In order to avoi
d these issues\, in this work\, we investigate the plausibility of using f
ermion production as a dominant friction source to drain the relaxion ener
gy\, maintaining the slow-roll of the relaxion. Benchmark points will be g
iven for successful relaxation\, and some remaining issue and the phenomen
ology will also be discussed.
LOCATION:Social Room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4300
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Georgios Papathanasiou on The Steinman Cluster Bo
otstrap for N=4 Super Yang-Mills Amplitudes
DTSTART;VALUE=DATE-TIME:20190514T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4301@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Scattering amplitudes form a bridge connecting theoretical par
ticle physics with the real world of collider experiments\, yet their comp
utation by means of Feynman diagrams quickly becomes prohibitive. Focusing
on the simplest case of N=4 super Yang–Mills theory\, in this talk I pr
esent recent progress in bypassing these limitations and directly construc
ting amplitudes\, by exploiting their expected analytic structure. First\,
I describe the discovery of new\, possibly universal analytic properties
known as the extended Steinmann relations\, or equivalently cluster adjace
ncy\, as well as the coaction principle. Then\, I demonstrate their power
in computing the six-particle amplitude up to seven loops\, as well as the
seven-particle amplitude up to four loops\, and discuss further applicati
ons.
LOCATION:THEP Sozialraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4301
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Vedran Brdar on Low Scale Neutrino Mass Generatio
n and Phenomenological Implications
DTSTART;VALUE=DATE-TIME:20190611T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4302@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the first part of the talk I will discuss the low scale (10
- 100 TeV) left-right symmetric model with “naturally” small neutrino
masses generated through the inverse seesaw mechanism. The inverse seesaw
implies the existence of novel fermion singlets\, S\, with Majorana mass
terms as well as the "left" and "right" Higgs doublets. These doublets pro
vide the portal for S and break the left-right symmetry. The generic featu
re of the model is the appearance of heavy pseudo-Dirac fermions\, formed
by S and the right-handed neutrinos\, which have the masses in the 1 GeV -
100 TeV range and can be searched at both current and future experiments
such as LHC\, SHiP\, DUNE\, and FCC-ee. In the second part of the talk I w
ill introduce the "neutrino option"\, a recent proposal that the electrowe
ak hierarchy problem is absent if the generation of the Higgs potential st
ems exclusively from quantum effects of heavy right-handed neutrinos which
can also generate active neutrino masses via the type-I seesaw mechanism.
In this framework\, the tree-level scalar potential is assumed to vanish
at high energies. Such a scenario therefore lends itself particularly well
to be embedded in a classically scale-invariant theory. I will demonstrat
e that the minimal scale-invariant framework compatible with the "neutrino
option" requires the Standard Model to be extended by two real scalar sin
glet fields in addition to right-handed neutrinos. In addition\, the phase
transition connected with scale symmetry breaking is of strong first orde
r with a substantial amount of supercooling. This yields a sizable gravita
tional wave signal\, so that the model can be fully tested by present and
future gravitational wave observatories.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4302
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Peter Lowdon on The generalised spectral structur
e of QCD
DTSTART;VALUE=DATE-TIME:20190618T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4312@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Local formulations of quantum field theory imply that gauge th
eory correlators can potentially contain generalised infrared poles. In th
is talk I will outline the theoretical significance of these components\,
and report on recent lattice fit results for the gluon propagator.
LOCATION:Social Room (05-427)\, Staudingerweg 7
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4312
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Johann Usovitsch on Kira: a Feynman integral redu
ction program and future plans
DTSTART;VALUE=DATE-TIME:20190625T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4316@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We will give an introduction to Kira a Feynman integral reduct
ion program. Further on we will report about the recent progress made in
the development of this program. The development is focused on algorithmic
improvements that are essential to extend the range of feasible high prec
ision calculations for present and future colliders. Finally we will intro
duce the future feature of Kira: reconstruction of rational functions fro
m samplings over the finite field.
LOCATION:MITP Seminar Room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4316
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Benzke on Subleading power corrections in
the decay B to X_s l^+l^-
DTSTART;VALUE=DATE-TIME:20190709T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4322@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:If you want to look for new physics in decays that involve had
rons\, you need to consider the related hadronic uncertainties. In this ta
lk I will discuss hadronic uncertainties in the decay B to X_s l^+l^- in t
he framework of SCET at subleading power. The talk is based on 1705.10366
and work in progress.
LOCATION:THEP Sozialraum
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4322
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fatemeh Elahi on Cold Gas Clouds as Dark Matter D
etectors
DTSTART;VALUE=DATE-TIME:20191015T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4357@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A few hundred cold gas clouds were recently discovered\, each
situated a few hundred parsecs from the center of the Milky Way Galaxy. Th
ese gas clouds can provide unprecedented sensitivity to dark matter-standa
rd model interactions. The main physical basis is simple: dark matter tend
s to have a higher temperature than the coldest interstellar and intergala
ctic gas. Therefore\, dark matter can heat the gas to higher-than-observed
temperatures\, if dark matter interacts enough with baryons or electrons
in the gas cloud. In this talk\, I will discuss the bounds cold gas clouds
give on ultra-light dark photon\, vector portal\, and millicharged dark m
atter.
LOCATION:Socialroom
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4357
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andreas Helset on Heavy Black Hole Effective Theo
ry
DTSTART;VALUE=DATE-TIME:20191022T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4379@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We formulate an effective field theory describing large mass s
calars and fermions minimally coupled to gravity. The operators of this ef
fective field theory are organized in powers of the transfer momentum divi
ded by the mass of the matter field\, an expansion which lends itself to t
he efficient extraction of classical contributions from loop amplitudes in
both the post-Newtonian and post-Minkowskian regimes. We use this effecti
ve field theory to calculate the classical and leading quantum gravitation
al scattering amplitude of two heavy spin-1/2 particles at the second post
-Minkowskian order.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4379
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexey Vladimirov on Evolution of transverse mome
ntum dependent distributions
DTSTART;VALUE=DATE-TIME:20191029T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4380@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The evolution of transverse momentum dependent distributions o
r TMD-evolution differs from ordinary renormalization group evolution in s
everal aspects. Two main ones are its double-scale nature and the presence
of non-perturbative component. In the talk\, I review the recent progress
in studies of TMD-evolution\, including the proof of rapidity-divergence
renormalization\, soft-rapidity correspondence\, zeta-prescription\, and c
omparison with the experimental measurements.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4380
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Leonardo Vernazza on Resummation of threshold log
arithms at next-to-leading power for electroweak annihilation processes
DTSTART;VALUE=DATE-TIME:20191119T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4381@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Scattering processes near threshold develop large logarithms\,
that need to be resummed. In my talk I will focus in particular on electr
oweak annihilation processes\, such as Drell-Yan and Higgs production in g
luon fusion\, and discuss the underlying factorisation theorems which allo
w the resummation of such logarithms at next-to-leading power\, comparing
diagrammatic and effective field theory methods.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4381
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthias Heller on Mixed EW-QCD two-loop correcti
ons to Drell-Yan production
DTSTART;VALUE=DATE-TIME:20191203T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4382@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Drell-Yan production of charged lepton pairs is one of the
key processes measured at hadron colliders. The QCD corrections to the
cross-section are known to order \\(\\alpha_s^2\\) and electroweak correct
ions are known to order \\(\\alpha\\). The next important step for a bett
er theoretical understanding is the complete calculation of the mixed QCD
-EW corrections of order \\(\\alpha \\alpha_s\\). In this talk\, I report
on the first calculation of the virtual two-loop corrections of order \\(\
\alpha \\alpha_s\\) to the cross-section. The calculation is carried out
analytically using tensor reduction\, IBP relations and the method of dif
ferential equations. We validate a previous calculation of the subset of
mixed QCD-QED corrections and show how the jet and soft functions of that
reference can be used to subtract the infrared divergencies of the comp
lete mixed QCD-electroweak virtual corrections. In the talk\, I will focus
on the calculation of the master integrals\, which involve algebraic lett
ers in the differential equation.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4382
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Guoxing Wang on Top quark pair production at hadr
on colliders
DTSTART;VALUE=DATE-TIME:20191210T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4383@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The invariant mass distribution of top quark pair production i
s an important observable whose threshold behavior is sensitive to top-qua
rk mass. In this talk\, I will focus on the invariant mass distribution of
top-quark pair production in threshold region and soft region. I will fir
st talk about the resummation of Coulomb corrections in threshold limit β
→ 0. We combine the resummation with fixed-order results and present ph
enomenologically relevant numeric results. We find that the resummation ef
fect significantly enhances the differential cross section in the threshol
d region\, and makes the theoretical prediction more compatible with exper
imental data. As for soft limit z → 1\, I’ll talk about the calculatio
n of NNLO soft function which is a major bottleneck in pushing up the soft
resummation accuracy of top-quark pair production. We show the non-trivia
l structure of three-parton correlations and the consistent extraction of
NNLO soft fragmentation function. At the end\, I’ll show the preliminary
results of hard function and its application to transverse momentum resum
mation for top-quark pair production and decay in the future.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4383
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Enrico Morgante on Relaxion mechanism: a cosmolog
ical solution to the hierarchy problem
DTSTART;VALUE=DATE-TIME:20191105T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4403@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The relaxion mechanism is a proposed solution to the hierarchy
problem\, in which the EW scale is set by the classical evolution of a sc
alar field in the early universe. In this talk\, I will review this constr
uction and discuss some recent developments.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4403
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fazlollah Hajkarim on Probing Pre-BBN Cosmology w
ith Primordial Gravitational Waves
DTSTART;VALUE=DATE-TIME:20191217T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4409@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Using the quantum chromodynamics (QCD) equation of state (EoS)
from lattice calculations we investigated QCD effects on the first order
primordial gravitational waves (PGWs) produced during the inflationary era
. We also considered the cases for vanishing and nonvanishing lepton asymm
etry where the latter one is constrained by cosmic microwave background ex
periments. Also\, we investigated scenarios that inflation is succeeded by
a phase where the energy density of the Universe was dominated by a scala
r component with a general equation of state. Then we evaluated the spectr
um of primordial gravitational waves induced in the post-inflationary Univ
erse. We showed that if the energy density of the Universe was dominated b
y some specific fluid 𝜙 before Big Bang Nucleosynthesis (BBN)\, its equ
ation of state could be constrained by gravitational wave experiments. Mor
eover\, we studied the effect of QCD and electroweak transitions on the in
duced (or second order) PGW from scalar perturbations which is different f
rom the first order PGW spectrum. Finally\, I briefly discuss the producti
on of dark matter (DM) in an early matter era dominated by a heavy long li
ved scalar field.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4409
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fabian Lange on The Perturbative Gradient Flow an
d its Applications
DTSTART;VALUE=DATE-TIME:20200128T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4442@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Gradient-Flow formalism was primarily introduced for simul
ations of Quantum Chromodynamics (QCD) on the lattice and has now found wi
despread use in this field. In addition\, it offers the potential for cros
s-fertilization between perturbative and lattice calculations.\n\nIn my ta
lk I will introduce the Gradient-Flow formalism and outline the perturbati
ve approach. Afterwards\, I will present two examples of its applications.
First\, I will show how it could be used to extract the strong coupling c
onstant from lattice simulations. As second application\, I will illustrat
e how it helps to define the energy-momentum tensor of QCD on the lattice.
LOCATION:MITP Seminar Room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4442
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Avirup Ghosh on Phenomenology of feebly coupled d
ark sectors
DTSTART;VALUE=DATE-TIME:20200204T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4443@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The existence of Dark Matter (DM) as one of the major componen
t of our universe is inevitable today. Though there are several evidences
of DM\, all of them are gravitational in nature. The particle nature of DM
is yet unknown. The most popular theory of particle DM is Weakly Interact
ing Massive Particles(WIMP) which though very interesting from the point o
f view of naturalness\, is not yet tested in experiments. On the other han
d\, Feebly Interacting Massive Particles (FIMP) as an alternative scenario
is gaining attention in recent times which due to their feeble interactio
n can not be observed in current generation of experiments. I shall discus
s in my talk how in some FIMP scenarios the tiny coupling of FIMP DM give
rise to interesting signals.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4443
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michele Redi on Gravitational Waves from supercoo
l axions
DTSTART;VALUE=DATE-TIME:20200421T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4466@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will describe the conditions under which the Peccei-Quinn ph
ase transition of the QCD axion is first order. I will then show that in a
pproximately conformal scenarios\, both at weak and strong coupling\, the
PQ phase transition can lead to a gravity wave background that is within t
he reach of Ligo or future ground based experiments.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4466
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Filippo Sala on Sub-GeV Dark Matter at large neut
rino experiments
DTSTART;VALUE=DATE-TIME:20200505T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4467@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Sub-GeV Dark Matter particles upscattered by cosmic rays gain
enough kinetic energy to pass the thresholds of large volume detectors on
Earth. I will show how public Super-Kamiokande and MiniBooNE data already
exclude previously allowed regions of both DM-electron and DM-nucleon inte
ractions. I will then discuss search strategies and prospects at existing
and planned neutrino facilities\, such as Hyper-K\, DUNE\, IceCube and KM3
NeT.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4467
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexander Ochirov on Classical scattering of spin
ning black holes from quantum amplitudes
DTSTART;VALUE=DATE-TIME:20200519T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4468@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In view of the recent observations of gravitational-wave signa
ls from black-hole mergers\, classical black-hole scattering has received
considerable interest due to its relation to the classical bound-state pro
blem of two black holes inspiraling onto each other. In this talk I will d
iscuss the link between classical scattering of spinning black holes and q
uantum scattering amplitudes for massive spin-s particles. Starting at fir
st post-Minkowskian (PM) order\, I will explain how the spin-exponentiated
structure of the relevant tree-level amplitude follows from minimal coupl
ing to Einstein's gravity and in the \\(s \\rightarrow \\infty \\) limit g
enerates the black holes' complete series of spin-induced multipoles. The
resulting scattering function will be shown to encode in a simple way the
known net changes in the black-hole momenta and spins at 1PM order and to
all orders in spins. Then I will move on to the new results at 2PM order f
or the case of aligned black holes' spins and discuss the current state of
the art for classical black-hole scattering.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4468
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Elina Fuchs on Baryogenesis\, Higgs rates and EDM
s with complex Yukawas
DTSTART;VALUE=DATE-TIME:20200609T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4496@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Complex Yukawa couplings of the Higgs boson have interesting i
mplications for Higgs production and decay rates\, EDMs and CP violation f
or electroweak baryogenesis. I will present if there are viable regions fu
lfilling all of these three complementary constraints\, for real and imagi
nary dimension-six terms of the tau\, muon\, top and bottom. After conside
ring each flavor separately\, I will show that combinations of several sou
rces allow for cancellations in the EDM and an enhancement of the baryon a
symmetry.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4496
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gustavo Marques Tavares on Magnetic gliding in th
e early universe
DTSTART;VALUE=DATE-TIME:20200616T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4497@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will discuss the effects of single derivative m
ixing in massive bosonic fields. In the regime of large mixing this leads
to striking changes of the field dynamics\, delaying the onset of classica
l oscillations and decreasing the effects of friction due to Hubble expans
ion. I will discuss how this can change the cosmological evolution of the
axion field in the presence of primordial magnetic fields\, and show that
this increases the axion abundance allowing heavier axions to make up all
of dark matter.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4497
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Yann Gouttenoire on Beyond the Standard Model wit
h Cosmic Strings
DTSTART;VALUE=DATE-TIME:20200707T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4500@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Cosmic strings (CS) are topological defects formed after spont
aneous breaking of a U(1) symmetry. Remarkably\, thanks to the scaling reg
ime\, CS loops constitute a long-standing source of Gravitational Waves (G
W) and produce a flat GW spectrum during radiation domination\, spanning m
any orders of magnitude in frequency.\nI will discuss reasons to be excite
d about the possible future detection of GW from CS by the next generation
of GW interferometers\, in order to bring light on the existence of non-s
tandard cosmology before Big-Bang Nucleosynthesis starts and the related B
eyond-Standard-Model physics. I will discuss the possibility to probe supe
rstring theories with moduli scale up to 10^{10} GeV\, heavy dark photon w
ith kinetic mixing as low as 10^{-18}\, heavy ALPs with masses between 1 G
eV and 10^{10} GeV or PBHs below 10^9 grams.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4500
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matheus Hostert on Annihilating kaons into a dark
sector at the KOTO experiment
DTSTART;VALUE=DATE-TIME:20200630T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4501@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In light of the recent experimental progress in the study of n
eutral and charged kaon decays\, I will discuss how $K_L$ decays can offer
a strong probe of dark sectors\, independently from the decays of their c
harged partner. This is motivated by a recent excess in $K_L \\to \\pi^0 \
\nu\\overline{\\nu}$ reported by the KOTO experiment\, which\, if confirme
d\, would indicate the existence of light or new exotic particles. The mod
els I discuss can easily accommodate such signatures\, with some examples
containing a dark matter candidate.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4501
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Javier Fuentes-Martin on Third-family quark-lepto
n unification with a composite Higgs
DTSTART;VALUE=DATE-TIME:20201110T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4558@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will present a model for third-family quark-l
epton unification at the TeV scale featuring a composite Higgs sector. The
model is based on a variant of the Pati-Salam model\, the so-called 4321
model. The spontaneous symmetry breaking to the SM gauge group is triggere
d dynamically by a QCD-like confining sector. The same strong dynamics als
o produces a pseudo Nambu-Goldstone boson Higgs\, connecting the energy sc
ales of both sectors. The model predicts a massive U1 vector leptoquark co
upled dominantly to the third generation\, recently put forward as a possi
ble solution to the B-meson anomalies.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4558
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ana Peñuelas on Global fits to \\(b \\to c \\tau
\\nu\\) transitions
DTSTART;VALUE=DATE-TIME:20201117T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4560@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We perform a general model-independent analysis of \\(b \\to c
\\tau \\bar{\\nu}_\\tau\\) transitions\, including measurements of \\(\\m
athcal{R}_D\\)\, \\(\\mathcal{R}_{D^*}\\)\, their \\(q^2\\) differential d
istributions\, the longitudinal \\(D^*\\) polarization \\(F_L^{D^*}\\)\, a
nd constraints from the \\(B_c \\to \\tau \\bar{\\nu}_\\tau\\) lifetime\,
each of which has significant impact on the fit. A global fit to a general
set of Wilson coefficients of an effective low-energy Hamiltonian is pres
ented working with a minimal set of assumptions: new physics is present on
ly in the third generation of leptons\, there are not light right-handed n
eutrinos\, the electroweak symmetry breaking is linearly realized and the
CP-conserving limit is taken. The solutions of the fit are interpreted in
terms of hypothetical new-physics mediators. \n\nThe impact of \\(F_L^{D^*
}\\)\, measured by Belle last year is studied in detail. The difficulty to
accommodate this measurement motivates the relaxation of some of our assu
mptions so the impact of a non-linear electroweak symmetry breaking and th
e addition of light right-handed neutrinos is studied.\n\nFrom the obtaine
d results we predict selected \\(b \\to c\\tau\\bar\\nu_\\tau\\) observabl
es\, such as the baryonic transition \\(\\Lambda_b \\to \\Lambda_c \\tau \
\bar{\\nu}_\\tau\\)\, the forward-backward asymmetries \\(\\mathcal{A}_\\t
ext{FB}^{D^{(*)}}\\)\, the \\(\\tau\\) polarization asymmetries \\(\\mathc
al{P}_\\tau^{D^{(*)}}\\)\, the longitudinal \\(D^*\\) polarization fractio
n \\(F_L^{D^*}\\) and several additional differential observables.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4560
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Davide Racco on Utilizing the causal spectrum of
gravity waves to probe free streaming particles and the cosmological expan
sion
DTSTART;VALUE=DATE-TIME:20201124T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4561@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The low frequency part of the gravitational wave spectrum gene
rated by local physics\, such as a phase transition\, is largely fixed by
causality\, offering a clean window into the early Universe. Due to the di
fference between sub-horizon and super-horizon physics\, it is inevitable
that there will be a distinct spectral feature that could allow for the di
rect measurement of the conformal Hubble rate at which the phase transitio
n occurred. \nAs an example\, free-streaming particles present during the
phase transition affect the production of super-horizon modes. This leads
to a steeper decrease in the spectrum at low frequencies as compared to th
e well-known causal \\(k^3\\) super-horizon scaling of stochastic gravity
waves. If a sizeable fraction of the energy density is in free-streaming p
articles\, they even lead to the appearance of oscillatory features in the
spectrum. \nIf the universe was not radiation dominated when the waves we
re generated\, a similar feature also occurs at the transition between sub
-horizon to super-horizon causality. These features can be used to show su
rprising consequences\, such as the fact that a period of matter dominatio
n following the production of gravity waves actually increases their power
spectrum at low frequencies.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4561
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Saereh Najjari on A minimal model for neutral nat
uralness and pseudo-Numbu-Goldstone dark matter
DTSTART;VALUE=DATE-TIME:20201201T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200204Z
UID:4563@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will introduce a scenario where both the Higgs and a
complex scalar dark matter candidate arise as the pNGB of breaking a g
lobal \\(SO(7)\\) symmetry to \\(SO(6)\\). In our construction the sy
mmetry partners of the Standard Model top-quark are charged under a hidd
en \\(SU(3)_c\\) color group. We show how the Large Hadron Collider along
with current and next generation dark matter experiments will explore thi
s framework.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4563
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Aldo Cotrone on Dark Holograms and Gravitational
Waves
DTSTART;VALUE=DATE-TIME:20201208T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4564@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will first review the basics of holography and some properti
es of the Sakai-Sugimoto model\, the top-down holographic theory closest t
o QCD. Then\, in this model I will describe the process of nucleation of b
ubbles of true vacua in the case of two first-order transitions: the confi
nement/deconfinement and chiral symmetry breaking/restoration ones. Finall
y\, using these information\, I will present the calculation of the gravit
ational wave spectra generated in these transitions\, when the Sakai-Sugim
oto model is employed as a dark sector. Prospects of detection will be dis
cussed.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4564
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Danny van Dyk on Non-local contribution to exclus
ive b->sll decays
DTSTART;VALUE=DATE-TIME:20210119T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4566@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss theory predictions for exclusive b->s ll decays
within the SM and beyond\, with emphasis on the hadronic matrix elements.
There are two categories of these matrix elements: local form factors\, a
nd nonlocal contributions arising from e.g. four-quark operators. I will r
eport the status and report recent progress from QCD-based methods on the
non-local hadronic matrix elements arising from intermediate charm states.
A particular focus will be a recent derivation of a dispersive bound on t
he non-local matrix element as discussed in arXiv:2011.09813.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4566
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alexandros Papageorgiou on Warm Dark Energy
DTSTART;VALUE=DATE-TIME:20201211T153000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4570@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Motivated by some of the recent swampland conjectures\, we stu
dy a model of dark energy in which a quintessence axion slowly rolls in a
steep potential due to its interactions with a U(1) or an SU(2) gauge fiel
d. We compare the differences between the U(1) and SU(2) cases and specif
y the parameter space for which the model is compatible with observations.
We also apply our methodology to studying the transition between a pre-in
flationary era and inflation and note some interesting oscillatory effects
in the particle production parameter which could lead to interesting phen
omenology. Finally we analyze the potential of the "Warm Dark Energy" mode
l to produce gravitational waves observable by PTA\, CMB polarization or s
pectral distortion experiments and find a negative result.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4570
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Zhengkang (Kevin) Zhang on Functional prescriptio
n for STrEAMlined EFT matching
DTSTART;VALUE=DATE-TIME:20210126T173000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4571@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Matching a UV theory onto a low-energy EFT can be efficiently
accomplished with functional methods. The functional approach is conceptua
lly appealing: all calculations are performed within the UV theory at the
matching scale\, and no prior determination of an EFT operator basis is re
quired. In this talk\, I will present a simple prescription for functional
matching up to one loop order\, which accommodates any relativistic UV th
eory that contains generic interactions among scalar\, fermion and vector
fields. I will also introduce STrEAM (SuperTrace Evaluation Automated for
Matching)\, a Mathematica package that helps streamline the procedure.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4571
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Riccardo Barbieri on A view of flavour physics in
2021
DTSTART;VALUE=DATE-TIME:20210209T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4576@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Motivated by the hierarchy problem and by the pattern of quark
masses and mixings\, I describe a picture of flavour physics that should
give rise in a not too distant future to observable deviations from the S
M in Higgs compositeness and/or in B-decays (if LFV confirmed) or perhap
s even in supersymmetry\, depending on the specific realization.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4576
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anders Eller Thomsen on Divergences and Ambiguiti
es in Renormalization Group Functions
DTSTART;VALUE=DATE-TIME:20210202T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4577@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:RG functions are used in QFT to evolve theories between energy
scales and are frequently used in both phenomenology and theory. Starting
at the 3-loop order\, certain RG functions start exhibiting poles in the
dimensional expansion\, contrasting with the expectation that they should
be finite. In this talk\, I will clarify how this issue can be understood
and how it is linked with an ambiguity in choosing renormalization constan
ts that goes beyond a simple choice of renormalization scheme. The discuss
ion will lead to a preferred prescription for the RG functions\, which gua
rantees finiteness.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4577
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Raffaele Tito D'Agnolo on The Weak Scale as a Tri
gger
DTSTART;VALUE=DATE-TIME:20210413T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4578@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss settings where the Higgs mass squared affects t
he vacuum expectation value of local operators and can thus act as a “tr
igger” of new cosmological dynamics. This triggering mechanism underlies
several existing solutions to the hierarchy problem that trace the origin
of the weak scale to the early history of the Universe. Thinking about th
ese solutions more systematically from the point of view of weak scale tri
ggers allows to understand their common predictions\, to find new solution
s and to identify unexpected physics related to naturalness in a rather mo
del-independent way. As an example I discuss a BSM trigger in a Two Higgs
Doublet Model and show how it can be used to link the tuning of the Higgs
mass to that of the cosmological constant. This weak scale trigger demands
the existence of new Higgs states necessarily comparable to or lighter th
an the weak scale\, with no wiggle room to decouple them.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4578
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Nick Evans on Chiral symmetry breaking and confin
ement: separating the scales
DTSTART;VALUE=DATE-TIME:20210216T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4582@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I review arguments that chiral symmetry breaking is triggered
when the quark bilinear condensate's dimension passes through one. This is
supported by gap equations and more recently holographic models. Confinem
ent may then be a separate property of the pure Yang-Mills theory below th
e scale of the dynamically generated quark mass\, occurring at the scale o
f the pole in the deep IR running. Theories with more than one representat
ion may have gaps between the condensation scales for the different repres
entations with confinement below the lowest scale. Here\, we use perturbat
ive results for the running of the gauge coupling and gamma in asymptotica
lly free SU(Nc) gauge theories with matter in higher dimension representat
ions to seek the best candidate theories where confinement and chiral symm
etry breaking can be maximally separated.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4582
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Xiaofeng Xu on Constructing canonical Feynman int
egrals with intersection theory
DTSTART;VALUE=DATE-TIME:20210420T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4597@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Canonical Feynman integrals are of great interest in the study
of scattering amplitudes at the multi-loop level. We propose to construct
d log-form integrals of the hypergeometric type\, treat them as a represe
ntation of Feynman integrals\, and project them into master integrals usin
g intersection theory. This provides a constructive way to build canonical
master integrals whose differential equations can be solved easily. We us
e our method to investigate both the maximally cut integrals and the uncut
ones at one and two loops\, and demonstrate its applicability in problems
with multiple scales.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4597
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lorenzo Ubaldi on Dark photon dark matter from a
rolling inflaton
DTSTART;VALUE=DATE-TIME:20210511T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4658@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A scalar inflaton coupled to a dark photon can produce a large
density of the latter. I will discuss the mechanism underlying this produ
ction\, which takes place mostly at the end of inflation. After reheating\
, the dark photons are relativistic at first and then redshift to non rela
tivistic. Their energy density today can match that of the observed dark m
atter in a wide region of parameters of the model. It is interesting to st
udy in detail also the dark photon power spectrum and its cosmic evolution
\, which predicts a clumpy nature of this dark matter candidate\, possibly
useful for experimental searches.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4658
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Admir Greljo on A model of muon anomalies
DTSTART;VALUE=DATE-TIME:20210504T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4659@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Recent R(K) update from the LHCb experiment at CERN reinforced
the tension of B-meson decays into muons. Shortly after\, the Muon g-2 ex
periment at Fermilab strengthened the tension in the muon anomalous magnet
ic moment. Immense theoretical and experimental work is still needed to po
ssibly establish the existence of new physics\, nonetheless\, we can alrea
dy ask relevant questions. Can muon anomalies be coherently addressed in m
odels beyond the SM\, and if so\, where else should we look for confirmati
on? I will discuss minimal extensions of the SM based on 2103.13991.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4659
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Florian Goertz on Unification of Gauge Symmetries
... including their breaking
DTSTART;VALUE=DATE-TIME:20210518T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4661@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, we present a minimal viable scenario that unifi
es the gauge symmetries of the SM and their breaking sector. Our Gauge-Hig
gs Grand Unification setup employs 5D warped space with a SU(6) bulk gauge
field that includes both a SU(5) grand unified theory (GUT) and a Higgs s
ector as a scalar component of the 5D vector field\, solving the hierarchy
problem. By appropriately breaking the gauge symmetry on the boundaries o
f the extra dimension the issue of light exotic new states\, appearing gen
erically in such models\, is eliminated and the SM fermion spectrum is nat
urally reproduced. The Higgs potential is computed at one-loop\, finding s
traightforward solutions with a realistic mh = 125 GeV. The problem of pro
ton decay is addressed by showing that baryon number is a hidden symmetry
of the model. The presence of a scalar leptoquark and a scalar singlet is
highlighted\, which might play a role in solving further problems of the S
M\, allowing for example for electroweak baryogenesis. Finally\, the X and
Y gauge bosons from SU(5) GUTs are found at collider accessible masses\,
opening a window to the unification structure at low energies.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4661
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ben Safdi on Compact stars as axion laboratories
DTSTART;VALUE=DATE-TIME:20210608T173000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4672@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The quantum chromodynamics axion and axion-like particles are
some of the most sought-after beyond the Standard Model particles at prese
nt because of their possible connections with the strong-CP problem\, dark
matter\, and ultraviolet physics such as Grand Unification and String The
ory. Laboratory searches are underway around the world to search for thes
e hypothetical particles\, but certain regions of axion parameter space --
such as ultralight axions with weak couplings to matter -- are notoriousl
y difficult to probe with terrestrial experiments\, despite their theoreti
cal motivations. However\, axions in this part of the parameter space may
be produced in abundance within compact stars such as white dwarfs and ne
utron stars. It has long been recognized that axion production in compact
stars opens up a new pathway for them to cool. I will point out\, howeve
r\, that axions may also lead to novel X-ray signatures around these stars
\, whereby the axions are produced within the stellar cores and then conve
rt to photons in the strong magnetic fields surrounding the stars. I will
discuss recent data taken by the XMM-Newton and Chandra telescopes from n
earby neutron stars and white dwarfs that provide some of the strongest pr
obes to-date of axions by searching for these processes.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4672
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Keri Vos on The story of Vcb\, continued
DTSTART;VALUE=DATE-TIME:20210622T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4673@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The determination of the CKM element Vcb from inclusive semile
ptonic b → c semileptonic decays has reached a high precision thanks to
a combination of theoretical and experimental efforts. Moreover\, the long
standing Vcb puzzle\, a discrepancy between inclusive and exclusive dete
rminations seems to be disappearing. In this talk\, I will discuss the sto
ry of Vcb and how to continue towards even higher precision focussing on t
he inclusive determination. Specifically\, I discuss two new strategies to
improve the precision. The first is based on reparametrization invariance
s\, which allows including higher power-suppressed terms in the heavy-quar
k expansion (HQE)\, the second is a method to control background effects u
sing the HQE.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4673
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Martin Winkler on Quantum Tunneling in the Early
Universe: Inflation and the Hubble Tension
DTSTART;VALUE=DATE-TIME:20210629T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4674@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will introduce Chain inflation as an alternative to slow rol
l inflation in which the universe undergoes a series of transitions betwee
n different vacua. The role of the inflaton can be played by an axion whic
h tunnels from minimum to minimum in a quasiperiodic potential. I will det
ermine the scalar power spectrum of chain inflation and show that it is fu
lly consistent with a ΛCDM cosmology. Then I will turn to the Hubble tens
ion\, the apparent discrepancy between local measurements of the Hubble co
nstant H0=74 km/s/Mpc and H0=67 km/s/Mpc inferred from the CMB. I will pro
pose Chain Early Dark Energy - the low-energy analog of chain inflation -
as a solution of the H0-tension and point to a connection to today's dark
energy.
LOCATION:MITP seminar room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4674
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tevong You on Self-Organised Localisation
DTSTART;VALUE=DATE-TIME:20210706T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4676@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We describe a new phenomenon in quantum cosmology: self-organi
sed localisation. When the fundamental parameters of a theory are function
s of a scalar field subject to large fluctuations during inflation\, quant
um phase transitions can act as dynamical attractors. As a result\, the th
eory parameters are probabilistically localised around the critical value
and the Universe finds itself at the edge of a phase transition. We illust
rate how self-organised localisation could account for the observed near-c
riticality of the Higgs self-coupling\, the naturalness of the Higgs mass\
, or the smallness of the cosmological constant.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4676
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthew Reece on Two Stories About Axion Physics
DTSTART;VALUE=DATE-TIME:20210615T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4688@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:This talk will take the form of two mini-talks\, which are loo
sely related in that both involve axion (or ALP) fields. First\, I will di
scuss challenges when fitting the muon g-2 anomaly with axion-like fields
in an EFT setting. I will argue that new particles are required near the w
eak scale to UV complete these models\, and these are subject to experimen
tal constraints and can also affect the muon g-2 directly. This is based o
n arXiv:2104.03267 with Manuel Buen-Abad\, JiJi Fan\, and Chen Sun. Second
\, I will discuss how axions interacting with abelian gauge fields acquire
a potential through a nonperturbative\, semiclassical effect involving lo
ops of monopoles and dyons. This is an application of the Witten effect. T
his is based on arXiv:2105.09950 with JiJi Fan\, Katie Fraser\, and John S
tout.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4688
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gilly Elor on Mesogenesis
DTSTART;VALUE=DATE-TIME:20210630T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4689@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will introduce a class of new mechanisms for low-scale baryo
genesis and dark matter production that utilize the CP violation within St
andard Model meson systems. Mesogenesis mechanisms operate at MeV scales a
nd such\, remarkably\, are experimentally testable. I will first give an o
verview of B-Mesogenesis\; in which baryogenesis proceeds through the osci
llation and subsequent decay into a dark sector of neutral B mesons. B-Mes
ogenesis is testable at current hadron colliders and B-factors\, and I wil
l present results of recent studies that pave the way towards constraining
(or discovering) this mechanism. Finally\, I will present a recent propos
al for D-Mesogenesis which relies on the CP violation of charged D mesons.
LOCATION:Hörsaal 20 (Geb. 1 231\, J.-J.-Becher Weg 14)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4689
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Robert McGehee on Maximizing Detection Rates with
HYPER Dark Matter
DTSTART;VALUE=DATE-TIME:20210929T153000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4711@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, we estimate the maximum reasonable direct detec
tion rate for sub-GeV dark matter scattering off nucleons and compare it t
o a plethora of experimental proposals' projected sensitivities. We then i
ntroduce a new class of HighlY interactive ParticlE Relics (HYPERs) which
can actually have a nucleon scattering cross section as large as this maxi
mum value. This is made possible by a late-time phase transition in the da
rk sector which decreases the mass of the mediator. HYPERs present a novel
dark matter benchmark in an otherwise sparsely populated\, but vigorously
probed\, parameter space.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4711
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Matthias Neubert on Resummation of Super-Leading
Logarithms
DTSTART;VALUE=DATE-TIME:20211019T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4712@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Jet cross sections at high-energy colliders exhibit intricate
patterns of logarithmically enhanced higher-order corrections. In particul
ar\, so-called non-global logarithms emerge from soft radiation emitted of
f energetic partons inside jets. While this is a single-logarithmic effect
at lepton colliders\, at hadron colliders phase factors in the amplitudes
lead to double-logarithmic corrections starting at four-loop order. This
effect was discovered a long time ago\, but not much is known about the hi
gher-order behavior of these terms and their process dependence. We derive
\, for the first time\, the all-order structure of these "super-leading lo
garithms" for generic \\(2\\to l\\) scattering processes at hadron collide
rs and resum them in closed form.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4712
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Miguel Escudero on The Hubble Tension: A Particle
Physics Perspective
DTSTART;VALUE=DATE-TIME:20211102T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4713@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We are living exciting times in Cosmology and we may be at the
edge of a shift in the cosmological paradigm. At present\, there is a 4-5
sigma tension in the value of the Hubble constant between the value that
is inferred locally (from Cepheids and type Ia Supernovae) and the value p
redicted in LCDM. This tension has been growing for the past 6-7 years and
many models have been proposed to account for it.\n\nIn the first part of
this seminar\, I will review the status of the Hubble tension. I will dis
cuss the observational situation and review the main theoretical approache
s developed to account for it. In the second part of the talk\, I will foc
us on my contribution to the topic (see 1909.04044\, 2004.01470\, 2103.032
49). I will show that the Hubble tension can be substantially ameliorated
in the presence of an eV-scale pseudo-Goldstone boson that interacts with
neutrinos: the Majoron. This particle is directly related to the neutrino
mass mechanism and naturally arises in the context of the type-I seesaw me
chanism with a spontaneously broken global U(1)L symmetry. Remarkably\, I
will further show that in some regions of the parameter space\, this scena
rio could also account for the observed baryon asymmetry of the Universe v
ia sterile neutrino oscillations in the early Universe. Thus\, providing a
n intriguing link between low-scale leptogenesis\, neutrino mass generatio
n and the Hubble tension.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4713
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anne Mareike Galda on ALP–SMEFT Interference
DTSTART;VALUE=DATE-TIME:20220118T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4714@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Standard Model Effective Field Theory (SMEFT) provides a s
ystematic framework to parametrize the low-energy effects of unknown heavy
particles. In this talk\, I will show that in the presence of additional
light particles such as axions and ALPs coupled to the Standard Model (SM)
via classically shift-invariant dimension-5 operators\, SMEFT Wilson coef
ficients are generated by means of one-loop order renormalization group (R
G) evolution equations. This yields additional contributions to low-energy
observables which I will discuss for the case of the top chromo-magnetic
dipole moment to lowest logarithmic order.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4714
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Joan Ruiz on Exploring Electric Dipole Moments of
Heavy Flavors
DTSTART;VALUE=DATE-TIME:20211109T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4732@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Recent experimental results on the B-anomalies\, CP-violation
in charm\, or the muon (g-2) hint at new physics models where the addition
al interactions are specific to the quark and lepton families. In this con
text\, searches for the electric dipole moment (EDM) of heavy-flavored bar
yons are especially motivated. Using bent crystal technology and the highl
y energetic beams of the LHC\, the EDM of very short-lived particles can b
e measured for the first time (1612.06769\, 2010.11902\, 2110.00845). In a
ddition\, the direct determination of the tau (g-2) is possible with this
novel experimental method (1901.04003). The different aspects of the measu
rement will be summarized along with the expected sensitivities. From a mo
re phenomenological perspective\, we will also see what are the effective
operators contributing to the baryon EDM and what is their expected size.
In particular\, new limits on the charm and bottom quark EDM are derived f
rom already existing measurements (1905.02513). We will analyze the implic
ations of these bounds for new physics models\, comparing them against oth
er competing observables.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4732
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jeff Dror on The Cosmic Axion Background
DTSTART;VALUE=DATE-TIME:20211116T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4733@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Existing searches for cosmic axions relics have relied heavily
on the axion being non-relativistic and making up dark matter. However\,
light axions can be copiously produced in the early Universe and remain re
lativistic today\, thereby constituting a Cosmic axion Background (CaB).
In this talk I will study the production and detection of a CaB. Prototypi
cal examples of axion sources are thermal production\, dark-matter decay\,
parametric resonance\, and topological defect decay. Each of these has a
characteristic frequency spectrum that can be searched for in axion direct
detection experiments. I will focus on the axion-photon coupling and stud
y the sensitivity of current and future versions of ADMX\, HAYSTAC\, DMRad
io\, and ABRACADABRA to a CaB\, finding that the data collected in search
of dark matter can be repurposed to detect axion energy densities well bel
ow limits set by measurements of the energy budget of the Universe. In thi
s way\, direct detection of relativistic relics offers a powerful new oppo
rtunity to learn about the early Universe and\, potentially\, discover the
axion.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4733
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Eran Palti on Convexity of Charged Operators in C
FTs and the Weak Gravity Conjecture
DTSTART;VALUE=DATE-TIME:20211207T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4735@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will introduce a particular formulation of th
e Weak Gravity Conjecture in AdS space in terms of the self-binding energy
of a particle. The holographic CFT dual of this formulation corresponds t
o a certain convex-like structure for operators charged under continuous g
lobal symmetries. Motivated by this\, we propose a conjecture that this co
nvexity is a general property of all CFTs\, not just those with weakly-cur
ved gravitational duals. It is possible to test this in simple CFTs\, the
conjecture passes all the tests performed so far.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4735
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Peera Simakachorn on GW signatures and spinning a
xions
DTSTART;VALUE=DATE-TIME:20211026T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4736@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In presence of a kination era\, induced by a fast-moving scala
r field dominating the energy density of the universe\, stochastic gravita
tional-wave (GW) backgrounds can be dramatically enhanced. Not only this c
ould boost the detectability of primordial GW from cosmic strings or primo
rdial inflation at current and future-planned GW observatories\, but it co
uld also help constraining particle theories that generate the kination ph
ase. We find that kination era at the GeV-EeV scale can induce a GW peak i
n the window of ET and CE. In this work\, we present two classes of spinni
ng axion models in which a phase of matter-domination followed by kination
-domination is naturally generated. Ultimately\, it is possible to relate
the GW signatures to the relic abundance of axion dark matter or to the ba
ryon asymmetry of the universe.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4736
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Guilherme Guedes on Running in the SMEFT
DTSTART;VALUE=DATE-TIME:20211123T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4752@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will discuss the calculation of the renormali
zation group equations (RGEs) of theories extending the Standard Model eff
ective field theory (SMEFT) with higher-dimensional operators or with a ne
w degree of freedom. In the first case\, I will explore the running of bos
onic dimension-eight operators triggered by two dimension-six interactions
. In the second scenario I will consider extending the SMEFT to include an
axion-like particle and study the RGE effects up to dimension 5. In both
cases\, some phenomenological consequences will be discussed.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4752
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Frank Saueressig on Form factors in Quantum Gravi
ty: status and perspectives
DTSTART;VALUE=DATE-TIME:20211020T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4776@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The asymptotic safety program strives for a high-energy comple
tion of gravity and gravity-matter systems by an interacting renormalizati
on group fixed point\, the Reuter fixed point. The fixed point renders the
theory safe from unphysical divergences at high energies and equips the
construction with predictive power. In this talk I will give a pedagogical
introduction to the program. In particular\, I will argue that the inclus
ion of form factors - generalizing the running couplings encountered in qu
antum field theory to curved spacetime - is essential for investigating qu
estions related to the causality and unitarity of Asymptotic Safety. Moreo
ver\, I will outline how form factors provide a concrete perspective for f
ormulating various quantum gravity programs in a unifying language.
LOCATION:Staudingerweg 7\, 05-427
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4776
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kevin Falls on Essential renormalisation group
DTSTART;VALUE=DATE-TIME:20211110T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4780@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk I will present a novel scheme for the exact renor
malisation group motivated by the desire of reducing the complexity of pra
ctical computations. The key idea is to specify renormalisation conditions
for all inessential couplings\, leaving us with the task of computing onl
y the flow of the essential ones. To achieve this\, a renormalisation grou
p equation for the effective average action which incorporates general non
-linear field reparameterisations is utilised. The field reparameterisatio
ns allow one to fix the values of inessential couplings.\nThe scheme has b
een used to investigate the Wilson-Fisher fixed point in the three dimensi
onal Ising model and the Reuter fixed point in quantum gravity. I will di
scuss the results of these investigations and the implications for quantum
gravity.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4780
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Abhishek Banerjee on Probing Relaxion (Scalars) a
t the Precision Frontier
DTSTART;VALUE=DATE-TIME:20211130T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4783@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The relaxion mechanism\, which was proposed recently\, can add
ress the hierarchy problem without resorting to new physics at the TeV sca
le. Our prior efforts on this subject have produced several new results\,
which have interesting phenomenological implications. We have shown that t
he relaxion can account for the observed dark matter relic density and can
be probed in various different frontiers. The relaxion has scalar couplin
g to the SM and as a result of the oscillating DM background\, the fundame
ntal constants of natures are oscillating in time as well. In this talk\,
I will discuss how the relaxion could be a viable DM candidate and then w
ill discuss how to search for scalar DM (relaxion) using precision spectro
scopy.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4783
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Bianca Dittrich on Complex actions and causality
violations in Lorentzian quantum gravity
DTSTART;VALUE=DATE-TIME:20220112T143000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4798@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:There is more and more evidence that quantum gravity should be
rather defined from the Lorentzian path integral than the Euclidean one.
But there are many open questions concerning the Lorentzian path integral.
Two of these are: Which configurations should be included in the Lorent
zian path integral\, e.g. should we include configurations that violate ca
usality conditions? And how to compute the Lorentzian path integral? \nUsi
ng Picard-Lefshetz theory to compute the Lorentzian path integral for Regg
e gravity\, I will explain how this method can also inform on the first qu
estion. This example indicates that we can allow for causality violations
to occur\, but that the corresponding amplitudes are suppressed by the dyn
amics.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4798
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Toby Opferkuch on Neutrino Signals from Muon Deca
y in Neutron Stars
DTSTART;VALUE=DATE-TIME:20220208T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4802@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Neutrino emission plays an important role in the cooling of ne
utron stars. Thermally emitted neutrinos\, however\, have sub-MeV energies
and are therefore all but impossible to detect from such distant sources.
In this talk I will argue that neutron stars should emit a secondary\, no
n-thermal\, neutrino flux arising from out-of-equilibrium muon decays. Muo
ns are abundant in the core of the star\, but due to the large electron ch
emical potential\, their decay is initially prevented by Pauli blocking.
Over timescales of order years\, however\, they can diffuse outwards into
regions of low electron chemical potential\, where their decay becomes pos
sible and results in a flux of neutrinos with energies up to 40 MeV. While
detecting this flux from a single neutron star is challenging\, the integ
rated flux from all neutron stars in the Milky Way is comparable to the di
ffuse supernova neutrino background\, it may be observable in next-generat
ion detectors like DUNE and HyperKamiokande. This would offer a unique new
way of probing the inner structure of neutron stars.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4802
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Aqeel Ahmed on Composite Dark Matter and Neutrino
Masses from a Light Hidden Sector
DTSTART;VALUE=DATE-TIME:20220125T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4809@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present a class of models in which dark matter is composed
of the composite states of a strongly coupled hidden sector. The hidden se
ctor interacts with the standard model through the neutrino portal\, allow
ing the relic abundance of dark matter to be set by annihilation into fina
l states containing neutrinos. The coupling to the hidden sector also lead
s to the generation of neutrino masses through the inverse seesaw mechanis
m\, with composite hidden sector states playing the role of the singlet ne
utrinos. We focus on the scenario in which the hidden sector is conformal
in the ultraviolet\, and the compositeness scale lies at or below the weak
scale. We construct a holographic realization of this framework based on
a five-dimensional warped geometry and study its phenomenology.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4809
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Rachel Houtz on Machine Learning a Manifold
DTSTART;VALUE=DATE-TIME:20220201T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4811@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I present a simple method to identify a continu
ous Lie group symmetry in a data set through regression by an artificial n
eural network. The proposal takes advantages of the order \\epsilon^2 scal
ing under infinitesimal symmetry transformations. The main advantages of t
his methodology are that it does not rely on binning of the data set and n
o assumptions about the symmetry need to be made. The method is demonstrat
ed in the SU(3)-symmetric (non-) linear sigma model.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4811
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Lennert Thormählen on Leading logs in QCD axion
effective field theory
DTSTART;VALUE=DATE-TIME:20220426T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4862@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The axion is much lighter than all other degrees of freedom in
troduced by the Peccei-Quinn mechanism to solve the strong CP problem. It
is therefore natural to use an effective field theory (EFT) to describe it
s interactions. Loop processes calculated in the EFT may however explicitl
y depend on the ultraviolet cutoff. In general\, the dimensionful coupling
s suggest to identify it with the Peccei- Quinn symmetry-breaking scale. A
n example are K+ → π+ + a decays that will soon be tested to improved p
recision and whose amplitude is dominated by the term logarithmically depe
ndent on the cutoff. This talk will critically examine the adequacy of usi
ng such a naive EFT approach to study loop processes by comparing EFT calc
ulations with ones performed in complete QCD axion models. In DFSZ models\
, for example\, the cutoff is found to be set by additional Higgs degrees
of freedom and to therefore be much closer to the electroweak scale than t
o the Peccei-Quinn scale. In fact\, there are non-trivial requirements on
axion models where the cutoff scale of loop processes is close to the Pecc
ei-Quinn scale\, such that the naive EFT result is reproduced. This sugges
ts that the existence of a suitable UV embedding may impose restrictions o
n axion EFTs. We provide an explicit construction of a model with suitable
fermion couplings and find promising prospects for NA62 and IAXO.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4862
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Rodolfo Capdevilla on Systematically testing all
new physics solutions of the muon g-2 anomaly
DTSTART;VALUE=DATE-TIME:20220503T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4863@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Fermilab Muon g−2 collaboration has recently released it
s first measurement of (g−2)μ. This result is consistent with previous
Brookhaven measurements and together they yield a statistically significan
t 4.2σ discrepancy with the Standard Model prediction. New physics soluti
ons to (g−2)μ feature light weakly coupled neutral particles or heavy s
trongly coupled charged particles. In this talk I present an experimental
program of existing and proposed experiments that can completely cover the
set of theories that explain this anomaly.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4863
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jack Holguin on Weighing the Top with Energy Corr
elators
DTSTART;VALUE=DATE-TIME:20220517T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4865@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Final states in collider experiments are characterized by corr
elation functions of the energy flow operator - which plays the roll of an
idealised calorimeter. In this talk\, I will show that the top quark impr
ints itself as a peak in the three-point correlator at an angle determined
by its mass and transverse momentum. This provides direct access to one o
f the most important parameters of the Standard Model in one of the simple
st field theoretical observables. \nThe analysis I will present provides a
new paradigm for a precise top mass determination that is\, for the first
time\, highly insensitive to soft physics and underlying event contaminat
ion.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4865
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Stefan Stelzl on Phase transitions from stars
DTSTART;VALUE=DATE-TIME:20220524T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4866@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We consider matter density effects in theories with a false gr
ound state. Large and dense systems\, such as stars\, can destabilize a me
tastable minimum and allow for the formation of bubbles of the true minimu
m. Interestingly these bubbles are not necessarily confined to the dense r
egion\, but can escape to infinity. This leads to a phase transition in th
e universe after the formation of stars\, and therefore has significant im
pact on e.g. solutions to the electroweak hierarchy problem based on dynam
ical selection of the electroweak vacuum. We work out some of the phenomen
ological consequences of such density triggered late phase transitions and
put new constraints on the parameter space of some benchmark relaxion mod
els.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4866
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andreas Crivellin on Discovering Lepton Flavour U
niversality Violating New Physics
DTSTART;VALUE=DATE-TIME:20220607T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4867@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Hints for the violation of lepton flavour universality (satis
fied within the SM) have accumulated in recent years. In particular\, devi
ations from the SM predictions were observed in semi-leptonic B decays (b-
>sll and b->ctau)\, in the anomalous magnetic moment of the muon (g-2)\, i
n leptonic tau decays and di-electron searches. Furthermore\, also the def
icit in first row CKM unitarity\, known as the Cabibbo Angle Anomaly\, can
be interpreted as a sign of lepton flavour universality violation. In thi
s talk I review the status of these anomalies and give an overview of the
possible interpretations in terms of new physics models.
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4867
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fernando Marchesano on Quantum Gravity\, Strings\
, and Hidden Energy Scales
DTSTART;VALUE=DATE-TIME:20220614T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4868@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:String theory has been used to construct models of particle ph
ysics and cosmology in which Quantum Gravity is automatically incorporated
. Such models always present certain features\, whose importance was up to
now deemed secondary. But what if they were an actual imprint of Quantum
Gravity into high energy physics? \n\nThe Swampland Programme aims to unve
il the general constraints that Quantum Gravity imposes on effective field
theories of particle physics and cosmology\, in order to derive actual pr
edictions. In this talk I will consider those proposals that describe the
energy scales that appear all the way up to the Planck mass\, describe the
ir implications for models of high energy physics\, and discuss the curren
t open problems that stem from them.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4868
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Rodolfo Ferro on Estimation of $\\hat{\\alpha}(M_
Z)$ and $\\sin^2\\hat{\\theta}_W(0)$.
DTSTART;VALUE=DATE-TIME:20220621T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4869@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The estimation of $\\alpha$ at the electroweak scale is an imp
ortant parameter required for electroweak precision tests. It is computed
through a combination of $\\e^+e^-\\rightarrow\\mathrm{hadrons}$ data plus
perturbative QCD contributions. The combination of data and pQCD can be o
ptimized to reduce the error on the prediction of $\\alpha(M_Z)$. Here\, I
will study how different groups choose the theory/data splitting and comp
are the type of errors associated with each framework. Later\, I will disc
uss the relation of the running of $\\alpha$ with the one of the weak mix
ing angle. Finally light new physics which might affect the measurement of
the weak mixing angle at low energies will be discussed.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4869
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Manuel Reichert on Spectral functions in quantum
gravity and gauge theories
DTSTART;VALUE=DATE-TIME:20220628T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4870@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Over the past decades\, the asymptotic safety scenario has mat
ured into a viable contender for a consistent theory of quantum gravity. A
pressing open question concerns the unitarity of the theory. I will prese
nt important steps towards tackling this issue and show the first direct c
omputation of the graviton spectral function in asymptotically safe quantu
m gravity with a novel Lorentzian renormalisation group approach. The resu
lting graviton spectral function displays a massless one-graviton peak and
a positive multi-graviton continuum with an asymptotically safe scaling f
or large spectral values\, though being gauge-dependent. To understand the
intricacies\, I will contrast this to a perturbatively well-controlled co
mputation of spectral functions in gauge theories with an infrared Banks-Z
aks fixed point. I will indicate consequences for scattering amplitudes an
d unitarity.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4870
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Myriam Mondragon on S3 as flavour symmetry: Higgs
sector and Dark matter
DTSTART;VALUE=DATE-TIME:20220712T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4871@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We present models with an extended Higgs sector\, three Higgs
doublets\, which have an underlying S3 flavour symmetry.\nS3 is the smalle
st non-Abelian discrete group\, corresponding to the permutation of three
objects\, which makes it naturally suitable for a flavour symmetry. We ap
ply this symmetry "universally" to the fermionic and scalar sectors.\nWe r
eview some previous results in the fermionic sector (quarks and leptons)\,
as well as recent results in the Higgs sector derived from the minimizati
on of the potential and the explicit calculation of the Higgs-Higgs and Hi
ggs-gauge boson couplings. We show that in the exact alignment limit (whe
n only one of the Higgs bosons couples to the gauge bosons)\, the results
at tree level coincide exactly with the Standard Model ones. We present th
e allowed parameter space for the scalar masses in the two possible alignm
ent scenarios\, with some interesting consequences. We also present the re
sults for a dark matter candidate coming from this type of models\, with a
fourth inert Higgs.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4871
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ennio Gozzi on Are there any problems for large v
alues of the action like there were for small ones?
DTSTART;VALUE=DATE-TIME:20220516T100000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4889@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:This seminar consists of a journey on the path-integral approa
ch to classical mechanics and a short walk on “dreams in progress” reg
arding the possible role of the action in the dark matter and dark energy
problems.
LOCATION:THEP seminar
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4889
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Mariana Grana on The tadpole problem
DTSTART;VALUE=DATE-TIME:20220719T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4890@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:One of the biggest problems in string compactifications is the
large number of massless fields associated to deformations of the interna
l geometry. These “moduli” get masses from fluxes wrapping non-trivia
l cycles on the manifold. Fluxes have an associated charge\, which on a co
mpact manifold has to satisfy tadpole cancelation conditions. The tadpole
conjecture proposes that the charge induced by the fluxes needed to stabi
lise a large number of moduli grows linearly with the number of moduli. In
this talk I will go over the basics of flux compactifications\, explain t
he conjecture\, present its motivation\, supporting evidence and consequen
ces.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4890
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Roberto Percacci on RG flows between Gaussian fix
ed points
DTSTART;VALUE=DATE-TIME:20220615T100000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4902@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A scalar theory can have many Gaussian (free) fixed points\, c
orresponding to Lagrangians of the form ‑\\phi\\box^n\\phi. We use the n
on-perturbative RG to study the flow from the free theory with four deriva
tives (n = 2) to the free theory with two derivatives (n = 1)\, in the pre
sence of a shift-invariant interaction. We show that the anomalous dimensi
on changes continuously in such a way that at the endpoints the fields hav
e the correct dimensions of the respective free theories. These results ge
neralize to other values of n\, as well as to nonlinear sigma models.
LOCATION:Galilei room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4902
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Sravan Kumar on Probing quantum gravity and non-l
ocality through R^2-like inflation
DTSTART;VALUE=DATE-TIME:20220705T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4907@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Cosmic inflation is an important paradigm of the early Univers
e which is so far developed in two equivalent ways\, either by geometrical
modification of Einstein's general relativity (GR) or by introducing new
forms of matter beyond the standard model of particle physics. Starobinsky
's R+R^2 inflation based on a geometric modification of GR is one of the m
ost observationally favorable models of cosmic inflation based on a geomet
ric modification of GR. In this talk\, I will discuss in detail the fundam
ental motivations for Starobinsky inflation and present how certain logica
l steps in the view of its UV completion lead to the emergence of a gravit
y theory that is non-local in nature. Then I will establish how one can pe
rform studies of the early Universe in the context of non-local gravity an
d what are the observational consequences in the scope of future CMB and g
ravitational waves. I will discuss in detail how non-local R^2-like inflat
ion can be observationally distinguishable from the local effective field
theories of inflation. Finally\, I will comment on prospects of non-local
gravity as a promising candidate for quantum gravity.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4907
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Raymond Co on Novel Cosmological Roles and Experi
mental Searches of (QCD) Axions
DTSTART;VALUE=DATE-TIME:20220909T133000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4922@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We established a paradigm where the (QCD) axion’s novel cosm
ological evolution\, a rotation in the field space\, can give rise to axio
n dark matter via kinetic misalignment and can generate the observed baryo
n asymmetry of the Universe via axiogenesis. The axion rotation also leads
a kination era\, leaving unique signatures in the primordial gravitationa
l wave spectrum. For ultralight (QCD) axions\, this cogenesis scenario mak
es intriguing predictions on axion properties more experimentally accessib
le than the conventional ones. For heavy and cosmologically unstable QCD a
xions\, the predictions from axiogenesis point to regions that can be prob
ed by neutrino experiments and long-lived particle searches. We will also
discuss how the presence of an axion-muon coupling will facilitate such pr
obes at\, e.g.\, ArgoNeuT\, DUNE\, FASER 2\, and SHiP.
LOCATION:Minkowski room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4922
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Michael Robert Trott on The Geometric SMEFT descr
iption of curved Higgs Field Space(s)
DTSTART;VALUE=DATE-TIME:20220909T103000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4923@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In recent years\, the effective field theory approach to the S
tandard Model\, the SMEFT\, has been used to study LHC data with ever incr
easing theoretical precision and sophistication. However\, the complexity
of this theory lead to several barriers to substantial theoretical progre
ss. In particular\, the explosion in the number of parameters in the SMEFT
as a function of operator mass dimension\, and the technical challenge or
reformulating SM predictions consistently into the SMEFT were very seriou
s problems. This called into question the possible success and value of th
e SMEFT physics program over the long term. I will discuss how these chall
enges have been overcome. The key point leading to this advance\, is the u
nderstanding that the projection of curved scalar field spaces generated b
y the Higgs onto a naive flat field space understanding-- implicitly embed
ded into the usual SMEFT Lagrangian\, and approach -- was the root cause
of many problems\, technical challenges and confusions. Many outstanding i
ssues have now been addressed and immediately overcome by reformulating th
e SMEFT noting its curved scalar field space(s) - in the Geometric SMEFT.
Some examples of the benefits of this approach will be presented\, and exp
lained.
LOCATION:Minkowski room
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4923
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Markus Fröb on Perturbative Quantum Gravity: Dif
feomorphisms\, Observables and Noncommutativity
DTSTART;VALUE=DATE-TIME:20221129T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4948@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Perturbative Quantum Gravity (pQG)\, the effective quantum fie
ld theory of gravitational fluctuations around a given background\, is cur
rently the only experimentally accessible theory of quantum gravity. Its t
ree-level predictions\, in the form of temperature fluctuations of the Cos
mic Microwave Background\, have been experimentally confirmed\, and it is
possible that loop corrections are accessible to future experiments. Howev
er\, while the tree-level results are well understood also from a theoreti
cal point of view\, the diffeomorphism symmetry of gravity makes the const
ruction of invariant observables very difficult beyond this. Only recently
\, this issue has been overcome\, and a class of causal invariant observab
les has been constructed. I will discuss this construction and how it can
be related to observations\, and present some predictions of pQG for gravi
ton loop corrections to the Newtonian gravitational potential and the Hubb
le rate\, the local expansion rate of the universe. Lastly\, I show that p
QG also predicts that spacetime becomes non-commutative at the Planck scal
e\, but in a different way from previous approaches. The talk is based (in
particular) on the recent papers arXiv:1806.11124\, 2108.11960\, 2109.097
53 and 2207.03345.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4948
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Cem Eröncel on ALP Dark Matter from Kinetic Frag
mentation: Opening up the parameter window and Observational Consequences
DTSTART;VALUE=DATE-TIME:20221108T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4949@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Axion-like-particle (ALP) is a well-motivated candidate for da
rk matter\, and it has been subject to extensive theoretical and experimen
tal research in recent years. The most popular ALP production mechanism st
udied in the literature is the misalignment mechanism\, where the ALP fiel
d initially has negligible kinetic energy and starts oscillating when its
mass becomes comparable to the Hubble scale. Recently\, a new mechanism ca
lled Kinetic Misalignment has been proposed where the ALP field receives l
arge kinetic energy at early times due to the explicit breaking of the Pec
cei-Quinn symmetry. This causes a delay in the onset of oscillations so th
at the ALP dark matter parameter space can be expanded to lower values of
the axion decay constant. At the same time\, the ALP fluctuations grow exp
onentially via parametric resonance in this setup\, and most of the energy
in the homogeneous mode is converted to ALP particles. This process is kn
own as fragmentation. In this talk\, I will discuss the observational cons
equences of fragmentation for the axion mini-clusters and show that a siza
ble region of the ALP parameter space can be tested by future experiments
that probe the small-scale structure.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4949
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Alfredo Guerrera on ALP production in weak mesoni
c decays
DTSTART;VALUE=DATE-TIME:20221122T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4950@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Axion--Like--Particles are among the most economical and well
motivated extensions of the Standard Model. In this talk ALP \nproduction
from hadronic and leptonic meson decays are studied. The hadronization par
t of these decay amplitudes has been\nobtained using Brodsky--Lepage metho
d or LQCD\, at needs. In particular\, the general expressions for ALP emis
sion in mesonic\ns-- and t--channel tree--level processes are thoroughly d
iscussed\, for pseudoscalar and vector mesons. Accordingly\, exact\nresult
s as well as some useful approximation for meson-to-meson and meson lepton
ic decay amplitudes are presented. \nI will the discuss the phenomenology
of various decays and highlight the most robust in terms of experimental s
earches\nand theoretical predictions. Finally\, bounds on the (low--energy
effective Lagrangian) ALP--fermion couplings are derived\,\nfrom present
and future flavour experiments. If I have time left I'll also cover some o
f the new form factors calculations in B mesogenesis.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4950
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Johanna Erdmenger on Berry phases\, wormholes and
factorization in AdS/CFT
DTSTART;VALUE=DATE-TIME:20221206T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4951@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Within the AdS/CFT correspondence\, the entanglement propertie
s of the CFT are related to wormholes in the dual gravity theory. This giv
es rise to questions about the factorisation properties of the Hilbert spa
ces on both sides of the correspondence. We show how the Berry phase\, a g
eometrical phase encoding information about topology\, may be used to reve
al the Hilbert space structure. Wormholes are characterized by a non-exact
symplectic form that gives rise to the Berry phase. For a wormholes conne
cting two spacelike regions in AdS3 spacetimes\, we find that the non-exac
tness gives rise to one phase space variable appearing in each of the two
boundary CFTs located at each end of the wormhole. The two CFTs are thus c
oupled\, reflecting non-factorization. Mathematical concepts such as coadj
oint orbits and geometric actions play an important role in this analysis.
In addition to its relevance for quantum gravity\, the approach present
ed also suggests how to experimentally realize the Berry phase and its rel
ation to entanglement in table-top experiments involving photons or electr
ons. This provides a new example for relations between very different bran
ches of physics that follow from the AdS/CFT correspondence and its genera
lizations. Based on 2202.11717 and 2109.06190.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4951
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pere Masjuan on The role of Pade approximants as
fitting functions
DTSTART;VALUE=DATE-TIME:20221111T150000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4982@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:HIM building\, room 02.111
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4982
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Mathias Becker on Impact of Long Range Forces on
Colored Dark Sectors
DTSTART;VALUE=DATE-TIME:20221115T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4984@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A non-minimal dark sector could explain why WIMP dark matter h
as evaded\ndetection so far. Based on the extensively studied example of a
simplified\nt-channel dark matter model involving a colored mediator\, we
demonstrate that\nthe Sommerfeld effect and bound state formation must be
considered for an\naccurate prediction of the relic density and thus also
when inferring the\nexperimental constraints on the model. We find that p
arameter space thought to\nbe excluded by LHC searches and direct detectio
n experiments still remains\nviable. Moreover\, we point out that the sear
ch for bound state resonances at the\nLHC offers a unique opportunity to c
onstrain a wide range of dark matter\ncouplings inaccessible to prompt and
long-lived particle searches.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4984
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Weiguang Jiang on Emergence of nuclear saturation
within Delta-full chiral effective field theory
DTSTART;VALUE=DATE-TIME:20230207T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:4986@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Nuclear saturation is a key property of low-energy nuclear phy
sics that depends on the fine details of the nuclear interaction. We devel
op a unified statistical framework that uses realistic nuclear forces to l
ink the theoretical modeling of finite nuclei and infinite nuclear matter.
We also construct fast and accurate emulators for nuclear-matter observa
bles and employ an iterative history-matching approach to explore and redu
ce the enormous parameter domain of Delta-full chiral interactions.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/4986
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Felix Kahlhöfer on Freezing-in a hot bath: reson
ances\, medium effects and phase transitions
DTSTART;VALUE=DATE-TIME:20230131T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5002@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Given our detailed knowledge of the dark matter energy density
in the present universe\, it is of great interest to study its evolution
at early times in order to understand the mechanism of dark matter product
ion. A particularly intriguing scenario\, known as freeze-in\, is that dar
k matter particles have tiny couplings and never enter into equilibrium wi
th the thermal bath of Standard Model particles. In this talk\, I will dis
cuss various technical challenges that arise in this scenario as a result
of the high temperatures and densities in the early universe. Specifically
\, I will show how to consistently treat the spin statistics of relativist
ic quantum gases and how to accurately calculate dark matter production vi
a the Higgs resonance. Finally\, I will discuss the case of freeze-in with
low reheating temperature\, which may be testable through cosmological\,
astrophysical and laboratory observations.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5002
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Carlos Tamarit on Revealing the Cosmic History wi
th Gravitational Waves
DTSTART;VALUE=DATE-TIME:20230117T141500
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5009@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The characteristics of the cosmic microwave background provide
circumstantial evidence that the hot radiation-dominated epoch in the ear
ly universe was preceded by a period of inflationary expansion. Here\, it
will be shown how a measurement of the stochastic gravitational wave backg
round can reveal the cosmic history and the physical conditions during inf
lation\, subsequent pre- and reheating\, and the beginning of the hot big
bang era. This will be exemplified with a particularly well-motivated and
predictive minimal extension of the Standard Model which is known to provi
de a complete model for particle physics -- up to the Planck scale\, and f
or cosmology -- back to inflation.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5009
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tim Höhne on Portals into Higgs Vacuum Stability
DTSTART;VALUE=DATE-TIME:20230110T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5010@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:We address the notorious metastability of the standard model (
SM) Higgs potential and promote it to a model building task: What are the
new ingredients required to stabilize the SM up to the Planck scale withou
t encountering subplanckian Landau poles? Using the SM extended by vector-
like fermions\, we chart out the corresponding landscape of Higgs vacuum s
tability. We find that the gauge portal mechanism\, triggered by new SM ch
arge carriers\, opens up sizeable room for stability in a minimally invasi
ve manner.\nWe also find models with Yukawa portals into Higgs stability o
pening up at stronger coupling. Several models allow for vector-like fermi
ons in the TeV-range\, which can be searched for at the LHC. For nontrivia
l flavor structure of Yukawa couplings severe FCNC constraints arise which
complement those from stability\, and push lower fermion masses up to a f
ew hundred TeV.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5010
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Ricardo Cepedello on Mapping the SMEFT onto BSM m
odels
DTSTART;VALUE=DATE-TIME:20221213T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5015@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:While the matching of specific new physics scenarios onto the
SMEFT framework is a well-understood procedure\, the inverse problem\, goi
ng from the SMEFT to UV scenarios\, is more involved and requires the deve
lopment of new methods to perform a systematic exploration of models. In t
his talk\, I will discuss a diagrammatic approach to construct in an autom
ated way a complete set of possible BSM models\, given a certain set of we
ll specified assumptions\, that can reproduce specific patterns of SMEFT o
perators\, and illustrate its use by generating models with no tree-level
contributions to four-fermion operators. These class of models\, which on
the SMEFT only contribute to four-fermion operators at one-loop order\, ca
n contain relatively light particles that could be discovered at the LHC i
n direct searches\, and even accommodate a dark matter candidate. In these
scenarios\, there is an interesting interplay between indirect SMEFT and
direct searches\, combining low-energy observables with the SMEFT Higgs-fe
rmion analyses and searches for resonances at the LHC.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5015
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Quentin Decant on Lyman-α constraints on freeze-
in and superWIMPs
DTSTART;VALUE=DATE-TIME:20230124T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5022@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Dark matter (DM) from freeze-in or superWIMP production is wel
l known to imprint non-cold DM signatures on cosmological observables.\nIt
will be discussed how to derive constraints from Lyman-α forest observat
ions for both cases\, based on a reinterpretation of the existing Lyman-α
limits on thermal warm DM.\nSpecial emphasis is placed on the mixed scena
rio\, where contributions from both freeze-in and superWIMP are similarly
important. In this case\, the imprint on cosmological observables can devi
ate significantly from thermal warm DM. The above will be illustrated by s
tudying a coloured t-channel mediator DM model\, in which case contributio
ns from both freeze-in through scatterings and decays\, as well as superWI
MP production can be important. The entire cosmologically viable parameter
space\, cornered by bounds from Lyman-α observations\, the LHC\, and Big
Bang Nucleosynthesis\, will be mapped.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5022
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anna Socha on Higgs boson-induced reheating and i
ts implications for dark matter
DTSTART;VALUE=DATE-TIME:20230418T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5069@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:According to the standard model of cosmology\, the Universe at
its very beginning underwent a phase of rapid expansion\, followed by a r
eheating period. During this epoch\, the energy density\, initially accumu
lated in the coherent oscillations of the inflaton field\, was injected in
to the visible sector\, eventually setting the initial conditions for the
hot Big Bang. In this talk\, I will discuss perturbative production of the
Standard Model (SM) particles adopting a non-standard post-inflationary s
cenario with a generic equation-of-state parameter \\(\\bar{w}\\). To spec
ify the inflaton dynamics\, I will employ the \\(\\alpha\\)-attractor T-mo
del of inflation\, such that \\(\\phi\\) has a monomial potential \\(V(\\p
hi) \\propto \\phi^{2n}\\) about the minimum. Moreover\, I will explore th
e Higgs boson-induced reheating\, assuming that it is achieved through a c
ubic inflaton-Higgs coupling \\(\\phi |\\mathcal{H}|^2\\). In the presence
of such interaction\, the Higgs field acquires a \\(\\phi\\)-dependent ma
ss which generates a vacuum expectation value that oscillates in time and
breaks the electroweak gauge symmetry. Interestingly\, the non-zero Higgs
mass leads to a time-dependent inflaton decay rate and generates a phase-s
pace suppression of the reheating efficiency. This\, in turn\, has non-tri
vial consequences for the reheating dynamics\, modifying the evolution of
the SM radiation energy density or the duration of the reheating phase. Fu
rthermore\, the implications of the non-standard reheating for the dark se
ctor will be discussed\, exemplified by the UV freeze-in dark matter model
.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5069
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Fabrizio Rompineve on QCD axion production in the
early Universe
DTSTART;VALUE=DATE-TIME:20230425T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5070@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:A population of relativistic QCD axions can be produced in the
early Universe\, via scatterings with Standard Model particles. This can
be searched for in cosmological datasets\, which therefore provide the opp
ortunity to discover/constrain the QCD axion\, independently of astrophysi
cal and/or laboratory probes. \n\nIn this talk\, after reviewing the subje
ct\, I present an improved calculation of the relic abundance of such “h
ot” axions from scatterings with pions below the QCD crossover\, as well
as the resulting upper bound on the QCD axion mass. I then discuss the ex
citing outlook of upcoming cosmological surveys\, which may probe otherwis
e unexplored regions of the QCD axion parameter space. I highlight the nee
d of a non-perturbative calculation of axion production rates throughout t
he QCD crossover\, to fully exploit the reach of such datasets.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5070
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jose Zurita on Exploring the Lifetime Frontier
DTSTART;VALUE=DATE-TIME:20230502T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5071@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the last years there has been a renewed interest in the par
ticle physics theoretical and experimental communities on the study of exo
tic (non-standard) signatures at colliders\, including Long-Lived Particle
s (LLPs).\nIn this talk I will first give a brief overview of the theoreti
cal motivations for long-lived particles. Later I will illustrate the impa
ct of LLPs in the current LHC physics programme\, including new LHC detect
ors specifically hunting for LLPs (MoEDAL\, FASER\, SND@LHC)\, detector pr
oposals under consideration (MATHUSLA\, ANUBIS\, FPF) and relevant upgrade
s to the ATLAS\, CMS and LHCb experiments. Finally\, I will present snapsh
ots of novel signatures and the implications of LLP searches in the contex
t of neutrino\, axion\, dark matter and Higgs physics.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5071
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Anne Spiering on Bootstrapping the elliptic doubl
e box
DTSTART;VALUE=DATE-TIME:20230516T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5072@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The direct integration of Feynman integrals can be a daunting
task\, in particular for increasing numbers of loops and external particle
s. The “symbol bootstrap” has proven to be a powerful tool in the calc
ulation of certain polylogarithmic Feynman integrals and scattering amplit
udes that bypasses this direct integration. In this approach one first wri
tes an ansatz for the symbol of the integral and then fixes its degrees of
freedom by imposing known mathematical and physical properties of the fin
al result. In this talk I will discuss a generalisation of this approach t
o an elliptic case: the 12-point two-loop double-box integral. The bootstr
apping ansatz is obtained from an elliptic generalisation of the so-called
Schubert problem\, and after imposing a sufficient number of constraints
on this ansatz\, we obtain a compact one-line formula for the (2\,2)-copro
duct of the double-box integral.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5072
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Felipe Llanes Estrada on EFT Matryoshkas
DTSTART;VALUE=DATE-TIME:20230523T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5073@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Electroweak Symmetry Breaking Sector of the Standard Model
is an active field where new physics is sought. In the absence of new hig
her-energy particles at colliders\, Effective Field Theories in terms of t
he Standard Model particles (longitudinal gauge\nand Higgs bosons) seem a
natural tool. New physics could then manifest itself as new forces modifyi
ng the couplings of those particles.\nShould such new forces be found\, th
ey could be used to confront (falsify?) the popular SMEFT: as it is not th
e most general possible EFT\, we have managed to produce correlations amon
g the parameters of the embedding HEFT that can be tested if that new phys
ics is describable by SMEFT. We have also extended HEFT via the Inverse Am
plitude Method to be able to address resonances in the electroweak sector
directly from the low-energy particles and eventual BSM couplings\, thus m
aintaining agnosticism about the nature of the eventual new physics\,\nand
I will discuss the systematic uncertainties of the unitarization procedur
e.\n\nBased on various works\, e.g.\nhttps://inspirehep.net/literature/212
0028 https://inspirehep.net/literature/2154526\nhttps://inspirehep.net/l
iterature/1826204 https://inspirehep.net/literature/1345172\nhttps://ins
pirehep.net/literature/1310013
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5073
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Bibhushan Shakya on The Tachyonic Higgs and the I
nflationary Universe
DTSTART;VALUE=DATE-TIME:20230606T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5074@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Standard Model Higgs becomes tachyonic at high energy scal
es according to current measurements. This unstable regime of the Higgs po
tential can be realized in the early Universe during high scale inflation\
, potentially with catastrophic consequences. In this talk\, we will discu
ss a crucial inherent feature of such configurations that has so far remai
ned ignored: Higgs particle production out of vacuum induced by the rapidl
y evolving Higgs field\, which gets exponentially enhanced due to the tach
yonic instability. We will discuss various theoretical and observational i
mplications of this effect.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5074
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thomas Thiemann on Hamiltonian renormalisation of
quantum gravity
DTSTART;VALUE=DATE-TIME:20230613T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5075@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Hamiltonian approach to quantum gravity initiated by Bergm
an\, Dirac\, DeWitt\, Komar\, Wheeler et al has a long tradition and many
quantum gravity programmes rest on it. While there has been progress in th
e past\, the current theory is still not predictive because the Einstein-H
ilbert Lagrangian is not even polynomial in the metric field which trigger
s many quantisation ambiguities. To eliminate those\, renormalisation meth
ods suggest themselves\, preferrably directly in the Hamiltonian rather th
an the path integral language. After an introduction to those concepts\, i
n this talk we present such a Hamiltonian renormalisation scheme which is
derived from Wilson's notion of non-perturbative renormalisation of path i
ntegrals together with methods from constructive QFT. As a test we study H
amiltonian renomalisation of parametrised field theory in 2D which is a to
y model for 4D quantum gravity in the sense that both theories are subject
to the hypersurface deformation algebroid shared by all generally covaria
nt field theories.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5075
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Thomas Becher on Resummation of Next-to-Leading N
on-Global Logarithms
DTSTART;VALUE=DATE-TIME:20230620T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5076@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In cross sections involving angular cuts\, intricate patterns
of enhanced higher-order corrections known as non-global logarithms arise.
These corrections do not exponentiate and to resum them to all orders one
has to resort to numerical techniques. The resummation of the leading non
-global logarithms was achieved twenty years ago\, but higher-logarithmic
resummations remained elusive. In my talk\, I will show how such resummati
on can be performed using renormalization group methods in effective field
theory. I will demonstrate how the associated evolution equations can be
implemented into a Monte-Carlo framework and will present first numerical
results for higher-logarithmic resummations at both lepton and hadron coll
iders.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5076
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Pouria Mazloumi on Integration over Riemann surfa
ces: String amplitudes and double copy
DTSTART;VALUE=DATE-TIME:20230704T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5077@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will discuss different types of integrals ove
r moduli space of punctured Riemann surfaces. First\, I start with string
scattering amplitudes and progress to the intersection number of twisted f
orms over the Riemann surface. I will discuss the equivalency between the
two integrals and how this relation can be used to produce QFT (tree-level
) amplitudes. In particular\, I explore the double copy construction in am
plitudes\, which states that gravitational amplitudes can be expressed in
terms of two sets of Yang-Mills amplitudes i.e.gravity=(gauge X gauge). I
will motivate a formal construction of double copy in terms of the twisted
cohomology and explain its relation to other forms of the double copy suc
h as BCJ double copy and color kinematic duality. I will finish by discuss
ing the possibility of extending this formalism into the loop level in bot
h string and QFT amplitudes.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5077
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tin Sulejmanpasic on Abelian Chern-Simons theory
on the Lattice
DTSTART;VALUE=DATE-TIME:20230725T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5078@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will introduce a formalism for abelian lattice gauge theorie
s called the Modified Villain Action formalism\, which has been popular in
recent years for constructing abelian gauge theories with correct symmetr
ies and anomalies of their continuum counterparts. I will then show that t
his formalism can be used to write down a \\(U(1)\\) Chern-Simons theory o
n the lattice for even levels. The theory we construct suffers from the pe
culiar zero modes of the Gaussian differential operator which are infamous
in the literature for plaguing the Chern-Simons theory with unphysical mo
des. I will show that such modes are related to a peculiar subsystem symme
try of a space-time lattice. This symmetry causes almost all Wilson loops
to vanish. However Wilson loop-like operators with strip-like topology sur
vive the pernicious symmetry and are topological\, exactly like one expect
s in the continuum. Further the strip-like topology of the loops is a latt
ice realization of a well known phenomenon in continuum called the framing
anomaly. I will further argue\, time permitting\, that the pernicious sym
metry is really a form of gauge symmetry\, projecting out certain states f
rom the Hilbert space\, and that it is not associated with any physical si
gnificance.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5078
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Christian Ecker on A dynamical inflaton coupled t
o strongly interacting matter
DTSTART;VALUE=DATE-TIME:20230530T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5121@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:According to the inflationary theory of cosmology\, most eleme
ntary particles in the current universe were created during a period of re
heating after inflation. In this talk I will show how to self-consistently
couple the Einstein-inflaton equations to a strongly coupled quantum fiel
d theory (QFT) that is described by holography. I will then use a specific
example to demonstrate that this setup leads to an inflating universe\, a
reheating phase and finally a universe dominated by the QFT in thermal eq
uilibrium.\nThis talk is based on arXiv:2302.06618.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5121
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Maria Anayeli Ramirez Ortiz on Advances in AdS/CF
T in low dimensions
DTSTART;VALUE=DATE-TIME:20230627T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5123@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The AdS3/CFT2 correspondence provides the best arena to test t
he holographic duality. This is because there is a better understanding of
how to quantise strings on AdS3\, compared with the higher dimensional ca
ses\, and the relative tractability of two-dimensional CFTs. In spite of t
his\, little effort has been made to construct and classify supersymmetric
AdS3 solutions. With a focus in their CFT interpretation\, in this talk I
will show you new AdS3 solutions in massive type IIA supergravity preserv
ing small N=(4\,0) supersymmetry. From the geometry\, we engineer the dual
CFT with well-known tools and propose a duality with a precise family of
quivers. Additionally\, we compute field theory and holographic central ch
arges showing a clean matching in both descriptions.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5123
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Elias Bernreuther on Light long-lived particles a
t the LHC and at Belle II
DTSTART;VALUE=DATE-TIME:20230721T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5131@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Searches for long-lived particles (LLPs) are a rapidly expandi
ng \nfrontier at the LHC and other collider experiments. Still\, many gaps
\nremain in the current search program\, in particular for LLPs with mass
es \nat the GeV or sub-GeV scale and with very large decay lengths. In thi
s \ntalk\, I will illustrate two different approaches to filling this gap
by \ndiscussing two models of light LLPs and their associated collider \ns
ignals. First\, I will show that the dominant decay mode of vectorlike \nl
eptons can be a very long-lived pseudoscalar and a tau lepton and argue \n
that the muon chambers of CMS or ATLAS are ideal places to search for \nth
is final state. Second\, I will illustrate the excellent sensitivity of \n
Belle II to light LLPs with meter-scale decay lengths using the example \n
of displaced vertex signals from strongly interacting dark sectors.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5131
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Cristina Benso on Sterile neutrino dark matter in
non-standard scenarios
DTSTART;VALUE=DATE-TIME:20230711T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5137@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In our current understanding of the universe\, the fundamental
nature of one of its most abundant constituents\, the dark matter (DM)\,
is still a mystery. Among the many theorized candidates to play the role o
f DM\, in this talk I will focus on sterile neutrinos with mass of O(keV)
and in particular on their production in the early universe and phenomenol
ogy in terrestrial experiments today. The simplest mechanism able to produ
ce sterile neutrino DM in the early universe is named Dodelson-Widrow mech
anism after its inventors. Although very fascinating due to its extreme si
mplicity\, if we assume that sterile neutrinos constitute the entire abund
ance of DM today this vanilla solution is\, on the one hand\, far from the
region of the parameter space in which near future experiments will be se
nsitive to such particles and\, on the other hand\, mostly excluded by X-r
ay observations. After introducing the standard/vanilla scenario\, I will
discuss three minimal modifications to the standard scenario that change d
rastically the perspectives of detection of this DM candidate in the near
future. They have to do with the following questions. What if before Big B
ang Nucleosynthesis the universe evolved differently with respect to what
is usually assumed? Should we consider the X-ray bound to be absolute or m
odel dependent? What if active neutrinos interact among each other also wi
th non-standard interactions?
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5137
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Hidenori SONODA on ERG and diffusion equation
DTSTART;VALUE=DATE-TIME:20230922T100000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5160@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I would like to explain how the construction of a Wilson actio
n in the exact renormalization group (ERG) formalism is related to diffusi
on equations for the fields. By making the diffusion equations gauge covar
iant\, we have managed to linearize the BRST invariance of U(1) gauge theo
ries. But with YM theories\, the BRST invariance remains non-linear\, and
we have not been able to solve the constraint. All this has been done in c
ollaboration with Hiroshi Suzuki (Kyushu University).
LOCATION:THEP seminar room (05-427)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5160
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Benoit Assi on Geometry of effective field theori
es: the fermion sector
DTSTART;VALUE=DATE-TIME:20231024T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5191@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The geometry underlying field space plays a pivotal role in go
verning on-shell scattering amplitudes. In this talk\, we present a compre
hensive geometric description of effective field theories\, building upon
prior work involving scalars and gauge fields\, and further extending it t
o fermions. This novel field-space geometry not only offers a systematic r
eorganization but also significantly streamlines the computation of quantu
m loop corrections. Capitalizing on this framework\, we attain the fermion
loop contributions to the renormalization group equations for bosonic ope
rators within the Standard Model Effective Field Theory\, covering up to m
ass dimension eight.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5191
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Meet and Greet on -
DTSTART;VALUE=DATE-TIME:20231031T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5192@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5192
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Encieh Erfani on All you need to know about Primo
rdial Black Holes
DTSTART;VALUE=DATE-TIME:20231107T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5193@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this presentation\, I will elucidate the mechanisms behind
Primordial Black Hole formation\, discuss their potential role as candidat
es for dark matter\, explore their significance as gravitational wave sour
ces\, and delve into the methodologies employed for their detection.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5193
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Helena Kolešová on Fun with non-Abelian dark se
ctors
DTSTART;VALUE=DATE-TIME:20231114T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5194@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Taking axion inflation as an example\, we study the evolution
of a non-Abelian dark sector coupled to the inflaton for different choices
of the confinement scale. Gravitational wave signals could be in principl
e generated due to a confinement phase transition or fluctuations in the t
hermal plasma\, however\, these signals might be strongly suppressed due t
o the presence of an early matter-dominated era. We also study the reheati
ng of Standard Model fields and explore the possibility of glueball dark m
atter within this scenario.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5194
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Maeve Madigan on Hide and seek: How PDFs can conc
eal new physics
DTSTART;VALUE=DATE-TIME:20231121T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5195@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The Standard Model Effective Field Theory (SMEFT) provides a p
owerful theoretical framework for interpreting subtle deviations from the
Standard Model and searching for heavy new physics at the LHC. \nAccurate
interpretations of LHC data\, however\, rely on the precise knowledge of
the proton structure in terms of parton distribution functions (PDFs). In
this seminar\, I will discuss the interplay between PDFs and the search f
or new physics. I will showcase a scenario for the High-Luminosity LHC in
which the PDFs may completely absorb such signs of new physics\, thus bias
ing theoretical predictions and interpretations. To address this challeng
e\, I will present a simultaneous determination of PDFs and the SMEFT usin
g the SIMUnet methodology. This approach integrates both PDF and SMEFT det
erminations into a single\, coherent framework\, making possible an assess
ment of the regions of parameter space in which the interplay is most phen
omenologically relevant\, both at the LHC and HL-LHC.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5195
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Stefano De Angelis on EFT matching from analytici
ty and unitarity of scattering amplitudes
DTSTART;VALUE=DATE-TIME:20231128T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5196@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In the first part of the seminar\, I will review some recent p
rogress made using modern on-shell techniques to understand (relativistic)
EFTs and uncover hidden structures\, with a particular focus on the SMEFT
(from a purely on-shell construction of EFTs to selection rules in cross-
section and RG equations). Motivated by this recent progress\, in the seco
nd part\, I will present a new on-shell formula for the matching of ultrav
iolet models featuring massive states onto their massless effective field
theory. This formula is based on a dispersion relation in the space of com
plex momentum dilations to capture\, in a single variable\, the relevant a
nalytic structure of scattering amplitudes at any multiplicity.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5196
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Maura Ramirez Quezada on The dark in the white
DTSTART;VALUE=DATE-TIME:20231205T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5217@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I'll explore the potential of using white dwarf
s as cosmic laboratories to investigate hidden interactions beyond the Sta
ndard Model. My focus will be on the cooling process of white dwarfs\, spe
cifically through neutrino emission\, and investigate the impact of a dar
k photon in a three-portal model on the neutrino emission during white dwa
rf cooling.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5217
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Gael Finauri on Light-cone distribution amplitude
s of energetic heavy mesons
DTSTART;VALUE=DATE-TIME:20231212T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5218@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Light-cone distribution amplitudes (LCDAs) frequently arise in
factorization theorems involving light and heavy mesons.\nThe QCD LCDA fo
r heavy mesons includes short-distance physics at energy scales of the hea
vy quark mass.\nIn this talk I will explain how to achieve the separation
of this perturbative scale from the purely hadronic effects by expressing
the QCD LCDA as a convolution of a perturbative « jet » function with
the universal\, quark-mass independent HQET LCDA.\nThis factorization allo
ws to efficiently resum large logarithms between Lambda QCD and m_Q as we
ll as between m_Q and the scale of the hard process in the production of b
oosted heavy mesons at colliders. \nAs an application I will present updat
ed theoretical predictions for the brancing ratio of W -> B \\gamma.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5218
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Andrea Sanfilippo on Effective field theory in de
Sitter space and the Method of Regions
DTSTART;VALUE=DATE-TIME:20231219T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5219@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The description of light and massless scalar fields in an infl
ationary spacetime is of phenomenological interest\, as they provide compe
lling candidates for the inflaton field. During most of the inflationary e
poch\, the spacetime can be approximated by the de Sitter spacetime\, and
the observables of interest are in-in correlation functions of fields in d
e Sitter space\, evaluated at late times. However\, the computation of the
se quantities is challenging\, particularly when loop corrections are take
n into account. In this talk\, I will discuss the recently proposed Soft d
e Sitter Effective Theory (SdSET) as an avenue to address these difficulti
es. I will then show how the Method of Regions can be used as a powerful t
ool to construct the late-time expansion of in-in correlators\, as well as
to gain further insight into the structure of SdSET.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5219
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Maria Ramos on Non-minimal effects in the axion/A
LP EFT
DTSTART;VALUE=DATE-TIME:20240130T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5220@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Singlet scalars\, namely axion-like particles (ALPs)\, are amo
ng the most promising candidates of new physics. Standard (minimal) assump
tions in the study of these particles might however hide a large landscape
of solutions to different puzzles in the Standard Model\, which can limit
our discovery potential. In the first part of the talk\, I will consider
the impact of scalar mixing in the standard axion mechanism to solve the s
trong CP problem. I will show that the canonical axion mass-scale relation
can be modified within QCD and multiple signals may be required to recons
truct the full solution to the strong CP problem\, constrained by a precis
e sum rule. In the second part of the talk\, I will discuss the impact of
operator mixing\, via RGEs\, in the ALP parameter space. I will specially
focus on shift-breaking and CP violating effects\, and I will discuss some
phenomenological applications.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5220
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Daniel Schmitt on Gravitational wave signatures o
f a supercooled Universe
DTSTART;VALUE=DATE-TIME:20240123T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5221@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Theories beyond the Standard Model (BSM) with classical scale
invariance predict an intriguing thermal history of the early Universe. Du
e to the absence of dimensionful terms at tree level in these models\, the
electroweak phase transition (EWPT) can be significantly delayed\, induci
ng a period of thermal inflation supercooling the Universe. The exit from
this supercooled state can then be triggered via different mechanisms\, de
pending on the model parameter space.\nIn the first part of my talk\, I wi
ll discuss the end of supercooling via a strong\, first-order QCD chiral p
hase transition. I will outline how the associated gravitational wave (GW)
production can be studied within effective QCD theories\, with a particul
ar focus on the effect of thermal inflation on the strongly coupled dynami
cs.\nIn the second part\, I will present an additional option to realize t
he exit from supercooling: a tachyonic phase transition. Here\, the SM qua
rk condensates source an exponential amplification of BSM scalar fields\,
generating a unique GW background detectable by future observatories.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5221
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Kristina Giesel on Dynamical reference systems in
quantum gravity models
DTSTART;VALUE=DATE-TIME:20231207T103000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5227@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Accessing the physical sector in models of quantum gravity is
on the one hand a challenge\, but on the other hand also an important step
to be able to analyse and test such models. One way to complete the quant
isation programme in loop quantum gravity is to choose dynamical reference
systems so-called matter or geometric clocks for which Dirac observable
s can be constructed in the framework of the relational formalism. The qua
ntisation step then consists in finding representations for the correspond
ing algebra of Dirac observables that allow one to quantise the dynamics a
s well. In this way\, one obtains an observer-dependent quantum field theo
ry. We will give a brief overview of the existing models and discuss their
similarities and differences. Finally\, we will discuss examples for inve
stigating some physical properties of models formulated with a particular
choice of clocks in cosmology and open quantum systems in which gravitatio
nally induced decoherence is present.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5227
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Zeno Capatti on Threshold singularities of Feynma
n diagrams and their cancellation in collider cross-sections
DTSTART;VALUE=DATE-TIME:20240109T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5230@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:In this talk\, I will review the main aspects of three-dimensi
onal approaches to the computation of Feynman diagrams and of the Local Un
itarity formalism. I will start by discussing the Cross-Free Family repres
entation\, which allows for a systematic analysis of the singularities of
Feynman diagrams. I will then introduce the Local Unitarity framework\, in
which interference diagrams are combined\, through a generally-applicable
mapping of the phase-space measure\, to give locally finite cross-section
s. Finally\, I will discuss the extension of the Local Unitarity formalism
to processes with initial state singularities\, which will allow me to di
scuss the role of spectator particles and higher-multiplicity initial-stat
e partonic configurations in the cancellation and factorisation of singula
rities.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5230
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Filippo Sala on Bubbletrons
DTSTART;VALUE=DATE-TIME:20240206T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5231@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will show how first order phase transitions (PT) in the earl
y universe\, with relativistic bubble walls\, constitute particle accelera
tors and colliders via the dense shell of particles that they necessarily
accumulate. These `bubbletrons' offer novel opportunities of observational
access to very high energy scales\, in addition to the gravitational wave
s from the PT. As three examples\, I will discuss: i) non-adiabatic produc
tion of ZeV dark matter which is hot enough to leave an imprint in the mat
ter power spectrum\; ii) production of relics beyond the GUT scale without
the need for the universe to ever reach those temperatures\; iii) realiza
tion of testable baryogenesis and leptogenesis down to the TeV scale. In p
assing I will mention open questions about the physics of particle shells
at bubble walls\, and their potential far-reaching implications.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5231
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Álvaro Pastor Gutiérrez on Unveiling hidden pha
ses and charting strong sectors
DTSTART;VALUE=DATE-TIME:20240116T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5239@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:While the Standard Model of particle physics has been extremel
y successful in predicting experimental results\, it still leaves us with
unanswered questions about dark matter\, the imbalance between matter and
antimatter\, and the emergence of fundamental scales. In this talk\, I wil
l outline our initial efforts to explore strong new physics scenarios usin
g the non-perturbative functional renormalisation group. I will begin by i
ntroducing the flow equation and applying it to the Standard Model\, there
by uncovering previously uncharted high-energy phases in the Higgs potenti
al. The second part of the talk will focus on a comprehensive study of (qu
asi-)conformal “Technicolour” theories\, aiming to identify Higgs-like
bound states and detectable dark sectors. To achieve this\, we will emplo
y bosonisation techniques\, which provide valuable insights into the prope
rties of dynamically emergent bound states. I will conclude with a specifi
c case study addressing the flavour puzzle within the framework of fundame
ntal partial compositeness.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5239
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Tom Tong on Fitting SMEFT with a CLEW
DTSTART;VALUE=DATE-TIME:20240320T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5257@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:The SMEFT global analyses commonly encounter two significant c
hallenges:\n1. An incomplete set of observables.\n2. Ad-hoc flavor assumpt
ions.\nThese issues significantly undermine the reliability and applicabil
ity of the results.\n\nIn our recent work\, we merged LHC data with EWPO a
nd revealed that global fits to this data set exhibit striking discrepanci
es with low-energy data. Our findings underscore the necessity of includin
g low-energy observables\, such as neutron and nuclear beta decay\, along
with meson decays\, in SMEFT global fits.\n\nBy integrating insights from
collider processes (C)\, low-energy processes (L)\, and electroweak precis
ion observables (EW)\, we introduce a holistic CLEW approach\, and as a ca
se study\, we shed light on potential BSM sources of the Cabibbo Angle Ano
maly (CAA)\, which demonstrates roughly a 3-sigma deviation. We were able
to apply strong phenomenological constraints instead of relying on flavor
assumptions to reduce the number of operators involved\, facilitating a ne
arly flavor-assumption-independent global analysis.\n\nMoreover\, to aid i
n model building and guide experimental searches\, we utilized the Akaike
Information Criterion (AIC) to identify the most relevant operators. The A
IC helps select a group of operators that not only fit well with the exper
imental data but also avoid unnecessary complexity.\n\nAdditionally\, I ai
m to further discuss the importance of including low-energy neutral curren
t data. The remarkable precision of the P2 experiment at MESA will be comp
etitive with existing collider measurements. We are currently upgrading ou
r CLEW framework to fully incorporate low-energy parity violation\, includ
ing the future projection of P2.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5257
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Julio Virrueta on Real-time gravitational path in
tegrals and holographic fluctuating hydrodynamics
DTSTART;VALUE=DATE-TIME:20240416T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5272@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:I will discuss the real-time dynamics of metric perturbations
around the AdS black hole and argue that the dynamic of these modes is cap
tured by a set of designer scalars in the background geometry. Using these
results I will obtain the real-time Gaussian effective action\, which inc
ludes both the retarded response and the associated stochastic fluctuation
s. Finally\, I will discuss extensions beyond linear response.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5272
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Jorinde van de Vis on TBA
DTSTART;VALUE=DATE-TIME:20240702T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5273@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:TBA
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5273
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Yann Gouttenoire on Primordial black holes from S
upercooled First-Order Phase Transition
DTSTART;VALUE=DATE-TIME:20240423T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5274@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:Cosmological first-order phase transitions are said to be stro
ngly supercooled when the nucleation temperature is much smaller than the
critical temperature. The phase transition takes place slowly and the pro
bability distribution of bubble nucleation times is maximally spread. Hubb
le patches which get percolated later than the average are hotter than the
background after reheating and potentially collapse into primordial black
holes (PBHs). I will give a review of this PBHs formation mechanism and o
f its most recent developments.
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5274
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Marco Fedele on TBA
DTSTART;VALUE=DATE-TIME:20240430T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5284@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:TBA
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5284
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theorie-Palaver: Antonela Matijašić on TBA
DTSTART;VALUE=DATE-TIME:20240507T140000
DTSTAMP;VALUE=DATE-TIME:20240412T200205Z
UID:5285@iannounce.physik.uni.mainz.de
CATEGORIES:
DESCRIPTION:TBA
LOCATION:Lorentz room (Staudingerweg 7\, 5th floor)
URL:https://iannounce.physik.uni-mainz.de/meeting/user/event/5285
END:VEVENT
END:VCALENDAR