Direct Dark Matter searches with the Edelweiss experiment: recent results and perspectives
Dr. Valentin Kozlov (Institut für Kernphysik, Karlsruhe)

EDELWEISS-2 is a Ge-bolometer experiment searching for WIMP dark matter and located in the underground laboratory, Laboratoire Souterrain de Modane (LSM, France). Recently, the collaboration has developed new cryogenic detectors with an improved background rejection (interleaved electrode design, Phys. Lett. B681 (2009) 305). A continuous operation of ten of these 400g bolometers at LSM together with an active muon veto shielding has been achieved. Results based on a total effective exposure of 384 kg•d obtained in 2009-2010 have been published recently (arXiv:1103.4070). A cross-section for spin-independent scattering of WIMPs on the nucleon of 4.4e-8 pb is excluded at 90%CL for a WIMP mass of 85 GeV. New constraints are also set on models where the WIMP-nucleon scattering is inelastic. These bolometer data and the latest measurements with 800g detectors are presented together with the background investigations, emphasizing studies of muon-induced neutrons.
This work is supported in part by the German Research Foundation (DFG) through its collaborative research center SFB-TR27 ("Neutrinos and Beyond"), by the French Agence Nationale pour la Recherche and the Russian Foundation for Basic Research (grant No. 07-02-00355-a).