Latest results of the EDELWEISS-II experiment

TL;DR

The EDELWEISS-II experiment conducted a one-year direct search for WIMP dark matter using cryogenic detectors, achieving competitive sensitivity and background rejection, and providing new constraints on WIMP properties.

Contribution

This paper reports the first results from the EDELWEISS-II experiment with ten 400-g detectors, demonstrating improved sensitivity and background rejection in WIMP searches.

Findings

Achieved a sensitivity of 4.4x10^{-8} pb for WIMP-nucleon cross-section.

Excluded the DAMA allowed region for WIMPs > 90 GeV with 120 keV mass splitting.

Presented initial results with 800-g detectors and future prospects.

Abstract

The EDELWEISS-II collaboration has performed a direct search for WIMP dark matter with an array of ten 400-g heat-and-ionization cryogenic detectors equipped with Inter-Digit electrodes for the rejection of near-surface events. Results from one year of continuous operation at the Laboratoire Souterrain de Modane will be presented. A sensitivity to the spin-independent WIMP-nucleon elastic cross-section of 4.4x10^{-8} pb was achieved using a 384 kgd effective exposure. We also interpret the results in the inelastic scattering scenario, excluding the DAMA allowed region for WIMP masses greater than 90 GeV for a mass splitting of 120 keV. The results obtained demonstrate the excellent background rejection capabilities of these simple and robust detectors in an actual WIMP search experiment. Some first results with 800-g detectors will be also presented together with the prospects for this experiment and the ton-scale EURECA project.