Theorie-Palaver

June 22, 2021 at 2:30 p.m. only via Zoom

Upalaparna Banerjee

Federico Gasparotto

Pouria Mazloumi

Yong Xu

The story of Vcb, continued
Keri Vos (Maastricht U. and Nikhef)


The determination of the CKM element Vcb from inclusive semileptonic 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 determinations seems to be disappearing. In this talk, I will discuss the story of Vcb and how to continue towards even higher precision focussing on the inclusive determination. Specifically, I discuss two new strategies to improve the precision. The first is based on reparametrization invariances, which allows including higher power-suppressed terms in the heavy-quark expansion (HQE), the second is a method to control background effects using the HQE.


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