Latest results of the direct dark matter search with the EDELWEISS-II experiment

TL;DR

The EDELWEISS-II experiment employs advanced cryogenic Germanium detectors to search for WIMP dark matter, achieving competitive sensitivity and demonstrating promising improvements for future detection capabilities.

Contribution

Introduction of new interleaved electrode Germanium detectors that significantly improve background rejection in WIMP searches.

Findings

Achieved a sensitivity of 5x10^-8 pb for WIMP-nucleon cross-section.

Used 10 detectors over 322 kg.days exposure in a one-year search.

Presented prospects to enhance sensitivity by an order of magnitude.

Abstract

The EDELWEISS-II experiment uses cryogenic heat-and-ionization Germanium detectors in order to detect the rare interactions from WIMP dark matter particles of local halo. New-generation detec- tors with an interleaved electrode geometry were developped and validated, enabling an outstanding gamma-ray and surface interaction rejection. We present here preliminary results of a one-year WIMP search carried out with 10 of such detectors in the Laboratoire Souterrain de Modane. A sensitivity to the spin-independent WIMP-nucleon cross-section of 5x10-8 pb was achieved using a 322 kg.days effective exposure. We also present the current status of the experiment and prospects to improve the present sensitivity by an order of magnitude in the near future.