Silicon Detector Dark Matter Results from the Final Exposure of CDMS II
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Agnese-2013-Silicon detector dark.pdf
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Author(s)
Anderson, Adam Jonathan
Billard, Julien
Figueroa-Feliciano, Enectali
Hertel, Scott Alexander
Leman, Steven W.
McCarthy, Kevin Ahmad
Date Issued
December 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Agnese, R., Z. Ahmed, A. Anderson, S. Arrenberg, D. Balakishiyeva, R. Basu Thakur, D. Bauer, et al. “Silicon Detector Dark Matter Results from the Final Exposure of CDMS II.” Physical Review Letters 111, no. 25 (December 2013). © 2013 American Physical Society
Version
Final published version
Abstract
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[+0.20 over −0.08](stat)[+0.28 over −0.24](syst). Other known backgrounds from neutrons and [superscript 206]Pb 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[superscript 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[superscript 2] and WIMP-nucleon cross section of 1.9 × 10[superscript −41] cm[superscript 2].
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.111.251301
