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A search for low-mass WIMPs with EDELWEISS-II heat-and-ionization detectors

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arxiv 1207.1815 v2 pith:NQ7AW342 submitted 2012-07-07 astro-ph.CO hep-exphysics.ins-det

A search for low-mass WIMPs with EDELWEISS-II heat-and-ionization detectors

EDELWEISS Collaboration: E. Armengaud , C. Augier , A. Beno\^it , L. Berg\'e , T. Bergmann , J. Bl\"umer , A. Broniatowski , V. Brudanin
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B. Censier M. Chapellier F. Charlieux F. Cou\"edo P. Coulter G. A. Cox J. Domange A. A. Drillien L. Dumoulin K. Eitel D. Filosofov N. Fourches J. Gascon G. Gerbier J. Gironnet M. Gros G. Heuermann S. Henry S. Herv\'e A. Juillard M. Kleifges H. Kluck V. Kozlov H. Kraus V. A. Kudryavtsev H. Le Sueur P. Loaiza S. Marnieros A. Menshikov X.-F. Navick C. Nones E. Olivieri P. Pari B. Paul M. Robinson S. Rozov V. Sanglard B. Schmidt B. Siebenborn D. Tcherniakhovski A. S. Torrento-Coello L. Vagneron R. J. Walker M. Weber E. Yakushev X. Zhang
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classification astro-ph.CO hep-exphysics.ins-det
keywords searchdatadetectorslow-energynuclearrecoilsscatteringwimp
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We report on a search for low-energy (E < 20 keV) WIMP-induced nuclear recoils using data collected in 2009 - 2010 by EDELWEISS from four germanium detectors equipped with thermal sensors and an electrode design (ID) which allows to efficiently reject several sources of background. The data indicate no evidence for an exponential distribution of low-energy nuclear recoils that could be attributed to WIMP elastic scattering after an exposure of 113 kg.d. For WIMPs of mass 10 GeV, the observation of one event in the WIMP search region results in a 90% CL limit of 1.0x10^-5 pb on the spin-independent WIMP-nucleon scattering cross-section, which constrains the parameter space associated with the findings reported by the CoGeNT, DAMA and CRESST experiments.

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