Silicon Detector Dark Matter Results from the Final Exposure of CDMS II

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We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons and Pb-206 are limited to <0.13 and <0.08 events at the 90% confidence level, respectively. The exposure of this analysis is equivalent to 23.4 kg day for a recoil energy range of 7-100 keV for a WIMP of mass 10 GeV/c(2). The probability that the known backgrounds would produce three or more events in the signal region is 5.4%. A profile likelihood ratio test of the three events that includes the measured recoil energies gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP + background hypothesis. The highest likelihood occurs for a WIMP mass of 8.6 GeV/c(2) and WIMP-nucleon cross section of 1.9 x 10(-41) cm(2).
Publisher
AMER PHYSICAL SOC
Issue Date
2013-12
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.111, no.25

ISSN
0031-9007
DOI
10.1103/PhysRevLett.111.251301
URI
http://hdl.handle.net/10203/212183
Appears in Collection
PH-Journal Papers(저널논문)
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