Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-17
Phys.Lett.B545:43-49,2002
Astronomy and Astrophysics
Astrophysics
14 pages, Latex, 5 figures. Submitted to Phys. Lett. B
Scientific paper
10.1016/S0370-2693(02)02238-4
The EDELWEISS experiment has improved its sensitivity for the direct search for WIMP dark matter. In the recoil energy range relevant for WIMP masses below 10 TeV/c2, no nuclear recoils were observed in the fiducial volume of a heat-and-ionization cryogenic Ge detector operated in the low-background environment of the Laboratoire Souterrain de Modane in the Frejus Tunnel, during an effective exposure of 7.4 kg.days. This result is combined with the previous EDELWEISS data to derive a limit on the cross-section for spin-independent interaction of WIMPs and nucleons as a function of WIMP mass, using standard nuclear physics and astrophysical assumptions. This limit excludes at more than 99.8%CL a WIMP candidate with a mass of 44 GeV/c2 and a cross-section of 5.4 x 10-6 pb, as reported by the DAMA collaboration. A first sample of supersymmetric models are also excluded at 90%CL.
Benoît Alain
Berge Laurent
Broniatowski A.
Chabert L.
Chambon B.
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