Phys. Rev. D
82,
122004
(2010)
[18 pages]
Low-threshold analysis of CDMS shallow-site data
D. S. Akerib et al. (CDMS Collaboration)
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D. S. Akerib3, M. J. Attisha1, L. Baudis20, D. A. Bauer4, A. I. Bolozdynya3,*, P. L. Brink10, R. Bunker16,†, B. Cabrera12, D. O. Caldwell16, C. L. Chang12,‡, R. M. Clarke12, J. Cooley11, M. B. Crisler4, P. Cushman19, F. DeJongh4, R. Dixon4, D. D. Driscoll3,§, J. Filippini2, S. Funkhouser15, R. J. Gaitskell1, S. R. Golwala2, D. Holmgren4, L. Hsu4, M. E. Huber17, S. Kamat3, R. Mahapatra14, V. Mandic19, P. Meunier15, N. Mirabolfathi15, D. Moore2, S. W. Nam12,**, H. Nelson16, R. W. Ogburn12, X. Qiu19,††, W. Rau8, A. Reisetter19,6, T. Saab18, B. Sadoulet5,15, J. Sander14, C. Savage16,‡‡, R. W. Schnee13, D. N. Seitz15, T. A. Shutt7,a, G. Wang3,b, S. Yellin12,16, J. Yoo4, and B. A. Young9 (CDMS Collaboration)
1Department of Physics, Brown University, Providence, Rhode Island 02912, USA
2Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
3Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA
4Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
5Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
6Department of Physics, St. Olaf College, Northfield, Minnesota 55057, USA
7Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
8Department of Physics, Queen’s University, Kingston, Ontario, Canada, K7L 3N6
9Department of Physics, Santa Clara University, Santa Clara, California 95053, USA
10SLAC National Accelerator Laboratory/KIPAC, Menlo Park, California 94025, USA
11Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA
12Department of Physics, Stanford University, Stanford, California 94305, USA
13Department of Physics, Syracuse University, Syracuse, New York 13244, USA
14Department of Physics, Texas A & M University, College Station, Texas 77843, USA
15Department of Physics, University of California, Berkeley, California 94720, USA
16Department of Physics, University of California, Santa Barbara, California 93106, USA
17Departments of Physics and of Electrical Engineering, University of Colorado Denver, Denver, Colorado 80217, USA
18Department of Physics, University of Florida, Gainesville, Florida 32611, USA
19School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
20Physics Institute, University of Zürich, Winterthurerstrasse 190, CH-8057, Switzerland
Received 22 October 2010; published 22 December 2010
Data taken during the final shallow-site run of the first tower of the Cryogenic Dark Matter Search (CDMS II) detectors have been reanalyzed with improved sensitivity to small energy depositions. Four ∼224 g germanium and two ∼105 g silicon detectors were operated at the Stanford Underground Facility (SUF) between December 2001 and June 2002, yielding 118 live days of raw exposure. Three of the germanium and both silicon detectors were analyzed with a new low-threshold technique, making it possible to lower the germanium and silicon analysis thresholds down to the actual trigger thresholds of ∼1 and ∼2 keV, respectively. Limits on the spin-independent cross section for weakly interacting massive particles (WIMPs) to elastically scatter from nuclei based on these data exclude interesting parameter space for WIMPs with masses below 9 GeV/c2. Under standard halo assumptions, these data partially exclude parameter space favored by interpretations of the DAMA/LIBRA and CoGeNT experiments’ data as WIMP signals, and exclude new parameter space for WIMP masses between 3 and 4 GeV/c2.
© 2010 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.82.122004
DOI:
10.1103/PhysRevD.82.122004
PACS:
95.35.+d, 14.80.Ly, 29.40.Wk, 95.30.Cq
*Present address: National Research Nuclear University MEPhI, 115409 Moscow, Russia. †bunker@hep.ucsb.edu Corresponding author. ‡Present address: Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA. §Present address: Kent State University, Ashtabula Campus, Ashtabula, OH 44004, USA. **Present address: National Institute of Standards and Technology, Boulder, CO 80305, USA. ††Present address: Department of Physics, Stanford University, Stanford, CA 94305, USA. ‡‡Present address: Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. aPresent address: Department of Physics, Case Western Reserve University, Cleveland, OH 44106, USA. bPresent address: Materials Science Division, Argonne National Laboratory, IL 60439, USA.
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