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

Agnese, R. and Ahmed, Z. and Cornell, B. D. and Filippini, J. and Golwala, S. R. and Moore, D. C. and Nelson, R. H. (2013) Silicon Detector Dark Matter Results from the Final Exposure of CDMS II. Physical Review Letters, 111 (25). Art. No. 251301. ISSN 0031-9007.

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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^(+0.20)_(−0.08)(stat)^(+0.28)_(−0.24)(syst). Other known backgrounds from neutrons and ^(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^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/c2 and WIMP-nucleon cross section of 1.9×10^(−41)  cm^2.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1103/PhysRevLett.111.251301DOIArticle Paper
Filippini, J.0000-0001-8217-6832
Golwala, S. R.0000-0002-1098-7174
Additional Information:© 2013 American Physical Society. Received 4 May 2013; revised 27 July 2013; published 16 December 2013. The CDMS Collaboration gratefully acknowledges the contributions of numerous engineers and technicians; we would like to especially thank Dennis Seitz, Jim Beaty, Bruce Hines, Larry Novak, Richard Schmitt, and Astrid Tomada. In addition, we gratefully acknowledge assistance from the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources. This work is supported in part by the National Science Foundation (Grants No. AST-9978911, No. NSF-0847342, No. NSF-1151869, No. PHY-0542066, No. PHY-0503729, No. PHY-0503629, No. PHY-0503641, No. PHY-0504224, No. PHY-0705052, No. PHY-0801708, No. PHY-0801712, No. PHY-0802575, No. PHY-0847342, No. PHY-0855299, No. PHY-0855525, No. PHY-1102795, and No. PHY-1205898), by the Department of Energy (Contracts No. DE-AC03-76SF00098, No. DE-FG02-92ER40701, No. DE-FG02-94ER40823, No. DE-FG03-90ER40569, No. DE-FG03-91ER40618, and No. DE-SC0004022), by the Swiss National Foundation (SNF Grant No. 20-118119), by NSERC Canada (Grants No. SAPIN 341314 and No. SAPPJ 386399), and by MULTIDARK Grants No. CSD2009-00064 and No. FPA2012-34694. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. De-AC02-07CH11359, while SLAC is operated under Contract No. DE-AC02-76SF00515 with the United States Department of Energy.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC03-76SF00098
Department of Energy (DOE)DE-FG02-92ER40701
Department of Energy (DOE)DE-FG02-94ER40823
Department of Energy (DOE)DE-FG03-90ER40569
Department of Energy (DOE)DE-FG03-91ER40618
Department of Energy (DOE)DE-SC0004022
Swiss National Science Foundation (SNSF)20-118119
Natural Sciences and Engineering Research Council of Canada (NSERC)SAPIN 341314-07
Natural Sciences and Engineering Research Council of Canada (NSERC)SAPPJ 386399
Department of Energy (DOE)DE-AC02-07CH11359
Department of Energy (DOE)DE-AC02-76SF00515
Issue or Number:25
Classification Code:PACS: 95.35.+d, 14.80.Ly, 29.40.Wk, 95.55.Vj
Record Number:CaltechAUTHORS:20140122-093108474
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43464
Deposited By: Jason Perez
Deposited On:23 Jan 2014 18:50
Last Modified:10 Dec 2019 00:04

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