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

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arxiv 1603.05120 v2 pith:6JOAYI7F submitted 2016-03-16 astro-ph.CO hep-exphysics.ins-det

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

EDELWEISS Collaboration: E. Armengaud , Q. Arnaud , C. Augier , A. Beno\^it , L. Berg\'e , T. Bergmann , J. Billard , J. Bl\"umer
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T. de Boissi\`ere G. Bres A. Broniatowski V. Brudanin P. Camus A. Cazes M. Chapellier F. Charlieux L. Dumoulin K. Eitel D. Filosofov N. Foerster N. Fourches G. Garde J. Gascon G. Gerbier A. Giuliani M. Grollier M. Gros L. Hehn S. Herv\'e G. Heuermann V. Humbert M. De J\'esus Y. Jin S. Jokisch A. Juillard C. K\'ef\'elian M. Kleifges V. Kozlov H. Kraus V. A. Kudryavtsev H. Le-Sueur J. Lin M. Mancuso S. Marnieros A. Menshikov X.-F. Navick C. Nones E. Olivieri P. Pari B. Paul M.-C. Piro D. V. 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
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classification astro-ph.CO hep-exphysics.ins-det
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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/$c^2$ 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 $\sim 2.5-20$ keV nuclear recoils inside the detector fiducial volume. As an illustration the number of observed events in the search for 5 (resp. 20) GeV/$c^2$ WIMPs are 9 (resp. 4), compared to an expected background of 6.1 (resp. 1.4). A 90% CL limit of $4.3\times 10^{-40}$ cm$^2$ (resp. $9.4\times 10^{-44}$ cm$^2$) is set on the spin-independent WIMP-nucleon scattering cross-section for 5 (resp. 20) GeV/$c^2$ WIMPs. This result represents a 41-fold improvement with respect to the previous EDELWEISS-II low-mass WIMP search for 7 GeV/$c^2$ 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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