Publications associated with Dark matter

Constraints on low-mass WIMPs from the EDELWEISS-III dark matter search

Journal of Cosmology and Astroparticle Physics Insitute of Physics 2016 (2016) 019-

E Armengaud, J Lin, M Mancuso, S Marnieros, A Menshikov, X-F Navick, C Nones, E Olivieri, P Pari, B Paul, M-C Piro, DV Poda, E Queguiner, M Robinson, H Rodenas, S Rozov, V Sanglard, B Schmidt, S Scorza, B Siebenborn, D Tcherniakhovski, L Vagneron, M Weber, E Yakushev, X Zhang

We present the results of a search for elastic scattering from galactic dark matter in the form of Weakly Interacting Massive Particles (WIMPs) in the 4-30 GeV/c2 mass range. We make use of a 582 kg-day fiducial exposure from an array of 800 g Germanium bolometers equipped with a set of interleaved electrodes with full surface coverage. We searched specifically for ∼ 2.5-20 keV nuclear recoils inside the detector fiducial volume. As an illustration the number of observed events in the search for 5 (resp. 20) GeV/c2 WIMPs are 9 (resp. 4), compared to an expected background of 6.1 (resp. 1.4). A 90% CL limit of 4.3 × 10-40 cm2 (resp. 9.4 × 10-44 cm2) is set on the spin-independent WIMP-nucleon scattering cross-section for 5 (resp. 20) GeV/c2 WIMPs. This result represents a 41-fold improvement with respect to the previous EDELWEISS-II low-mass WIMP search for 7 GeV/c2 WIMPs. The derived constraint is in tension with hints of WIMP signals from some recent experiments, thus confirming results obtained with different detection techniques.

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