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23 April 2024

» arxiv » 1304.4279

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Dark Matter Search Results Using the Silicon Detectors of CDMS II
CDMS Collaboration ; R. Agnese ; Z. Ahmed ; A.J. Anderson ; S. Arrenberg ; D. Balakishiyeva ; R. Basu Thakur ; D.A. Bauer ; J. Billard ; A. Borgland ; D. Brandt ; P.L. Brink ; T. Bruch ; R. Bunker ; B. Cabrera ; D.O. Caldwell ; D.G. Cerdeno ; H. Chagani ; J. Cooley ; B. Cornell ; C.H. Crewdson ; P. Cushman ; M. Daal ; F. Dejongh ; E. Do Couto E Silva ; T. Doughty ; L. Esteban ; S. Fallows ; E. Figueroa-Feliciano ; J. Filippini ; J. Fox ; M. Fritts ; G.L. Godfrey ; S.R. Golwala ; J. Hall ; R.H. Harris ; S.A. Hertel ; T. Hofer ; D. Holmgren ; L. Hsu ; M.E. Huber ; A. Jastram ; O. Kamaev ; B. Kara ; M.H. Kelsey ; A. Kennedy ; P. Kim ; M. Kiveni ; K. Koch ; M. Kos ; S.W. Leman ; B. Loer ; E. Lopez Asamar ; R. Mahapatra ; V. Mandic ; C. Martinez ; K.A. McCarthy ; N. Mirabolfathi ; R.A. Moffatt ; D.C. Moore ; P. Nadeau ; R.H. Nelson ; K. Page ; R. Partridge ; M. Pepin ; A. Phipps ; K. Prasad ; M. Pyle ; H. Qiu ; W. Rau ; P. Redl ; A. Reisetter ; Y. Ricci ; T. Saab ; B. Sadoulet ; J. Sander ; K. Schneck ; R.W. Schnee ; S. Scorza ; B. Serfass ; B. Shank ; D. Speller ; K.M. Sundqvist ; A.N. Villano ; B. Welliver ; D.H. Wright ; S. Yellin ; J.J. Yen ; J. Yoo ; B.A. Young ; J. Zhang ;
Date:	16 Apr 2013
Abstract:	We report results of a search for Weakly Interacting Massive Particles (WIMPs) with the silicon (Si) detectors of the CDMS II experiment. A blind analysis of data from eight Si detectors, with a total raw exposure of 140.2 kg-days, revealed three WIMP-candidate events with a final surface-event background estimate of 0.41 (-0.08 +0.20)(stat.) (-0.24 +0.28) (syst.). Other known backgrounds from neutrons and 206Pb are limited to < 0.13 and < 0.08 events at the 90% confidence level, respectively. These data place a 90% upper confidence limit on the WIMP-nucleon cross section of 2.4E-41 cm^2 at a WIMP mass of 10 GeV/c^2. Simulations indicate a 5.4% probability that a statistical fluctuation of the known backgrounds would produce three or more events in the signal region. A profile likelihood ratio test that includes the measured recoil energies of the three events gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP+background hypothesis. The highest likelihood was found for a WIMP mass of 8.6 GeV/c^2 and WIMP-nucleon cross section of 1.9E-41 cm^2.
Source:	arXiv, 1304.4279
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