Results on low mass WIMPs using an upgraded CRESST-II detector

CRESST Collaboration: G. Angloher , A. Bento , C. Bucci , L. Canonica , A. Erb , F. v. Feilitzsch , N. Ferreiro Iachellini , P. Gorla

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A. G\"utlein D. Hauff P. Huff J. Jochum M. Kiefer C. Kister H. Kluck H. Kraus J.-C. Lanfranchi J. Loebell A. M\"unster F. Petricca W. Potzel F. Pr\"obst F. Reindl S. Roth K. Rottler C. Sailer K. Sch\"affner J. Schieck J. Schmaler S. Scholl S. Sch\"onert W. Seidel M. v. Sivers L. Stodolsky C. Strandhagen R. Strauss A. Tanzke M. Uffinger A. Ulrich I. Usherov S. Wawoczny M. Willers M. W\"ustrich A. Z\"oller

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classification 🌌 astro-ph.CO astro-ph.IMphysics.ins-det

keywords cresst-iidetectordetectionmoduleresultsscatteringunitupgraded

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The CRESST-II cryogenic dark matter search aims for the detection of WIMPs via elastic scattering off nuclei in CaWO$_4$ crystals. We present results from a low-threshold analysis of a single upgraded detector module. This module efficiently vetoes low energy backgrounds induced by $\alpha$-decays on inner surfaces of the detector. With an exposure of \unit[29.35]{kg live days} collected in 2013 we set a limit on spin-independent WIMP-nucleon scattering which probes a new region of parameter space for WIMP masses below \unit[3]{GeV/c$^2$}, previously not covered in direct detection searches. A possible excess over background discussed for the previous CRESST-II phase 1 (from 2009 to 2011) is not confirmed.

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Results on low mass WIMPs using an upgraded CRESST-II detector

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