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23 April 2024

» arxiv » 1504.5871

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Improved WIMP-search reach of the CDMS II germanium data
R. Agnese ; A.J. Anderson ; M. Asai ; D. Balakishiyeva ; D. Barker ; R. Basu Thakur ; D.A. Bauer ; J. Billard ; A. Borgland ; M.A. Bowles ; D. Brandt ; P.L. Brink ; R. Bunker ; B. Cabrera ; D.O. Caldwell ; R. Calkins ; D.G. Cerdeño ; H. Chagani ; Y. Chen ; J. Cooley ; B. Cornell ; C.H. Crewdson ; P. Cushman ; M. Daal ; P.C.F. Di Stefano ; T. Doughty ; L. Esteban ; S. Fallows ; E. Figueroa-Feliciano ; G.L. Godfrey ; S.R. Golwala ; J. Hall ; H.R. Harris ; S.A. Hertel ; T. Hofer ; D. Holmgren ; L. Hsu ; M.E. Huber ; D. Jardin ; A. Jastram ; O. Kamaev ; B. Kara ; M.H. Kelsey ; A. Kennedy ; M. Kiveni ; K. Koch ; A. Leder ; B. Loer ; E. Lopez Asamar ; P. Lukens ; R. Mahapatra ; V. Mandic ; K.A. McCarthy ; N. Mirabolfathi ; R.A. Moffatt ; S.M. Oser ; K. Page ; W.A. Page ; R. Partridge ; M. Pepin ; A. Phipps ; K. Prasad ; M. Pyle ; H. Qiu ; W. Rau ; P. Redl ; A. Reisetter ; Y. Ricci ; H.E. Rogers ; T. Saab ; B. Sadoulet ; J. Sander ; K. Schneck ; R.W. Schnee ; S. Scorza ; B. Serfass ; B. Shank ; D. Speller ; D. Toback ; S. Upadhyayula ; A.N. Villano ; B. Welliver ; J.S. Wilson ; D.H. Wright ; X. Yang ; S. Yellin ; J.J. Yen ; B.A. Young ; J. Zhang ;
Date:	22 Apr 2015
Abstract:	CDMS II data from the 5-tower runs at the Soudan Underground Laboratory were reprocessed with an improved charge-pulse fitting algorithm. Two new analysis techniques to reject surface-event backgrounds were applied to the 612 kg days germanium-detector WIMP-search exposure. An extended analysis was also completed by decreasing the 10 keV analysis threshold to $sim$5 keV, to increase sensitivity near a WIMP mass of 8 GeV/$c^2$. After unblinding, there were zero candidate events above a deposited energy of 10 keV and 6 events in the lower-threshold analysis. This yielded minimum WIMP-nucleon spin-independent scattering cross-section limits of $1.8 imes 10^{-44}$ and $1.18 imes 10 ^{-41}$ cm$^2$ at 90\% confidence for 60 and 8.6 GeV/$c^2$ WIMPs, respectively. This improves the previous CDMS II result by a factor of 2.4 (2.7) for 60 (8.6) GeV/$c^2$ WIMPs.
Source:	arXiv, 1504.5871
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