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25 April 2024

» arxiv » 1603.5120

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Constraints on low-mass WIMPs from the EDELWEISS-III dark matter search
EDELWEISS Collaboration ; E. Armengaud ; Q. Arnaud ; C. Augier ; A. Benoît ; A. Benoît ; L. Bergé ; T. Bergmann ; J. Billard ; J. Blümer ; T. de Boissière ; 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. Hervé ; G. Heuermann ; V. Humbert ; M. De Jésus ; Y. Jin ; S. Jokisch ; A. Juillard ; C. Kéfélian ; 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 ;
Date:	Wed, 16 Mar 2016 14:37:16 GMT (1878kb,D)
Abstract:	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 $4.3 imes 10^{-40}$ cm$^2$ (resp. $9.4 imes 10^{-44}$ 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.
Source:	arXiv, 1603.5120
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