Phys. Rev. Lett.
106,
131302
(2011)
[5 pages]
Results from a Low-Energy Analysis of the CDMS II Germanium Data
Z. Ahmed et al. (CDMS Collaboration)
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Z. Ahmed1, D. S. Akerib2, S. Arrenberg19, C. N. Bailey2, D. Balakishiyeva17, L. Baudis19, D. A. Bauer3, P. L. Brink7, T. Bruch19, R. Bunker15, B. Cabrera11, D. O. Caldwell15, J. Cooley10, E. do Couto e Silva7, P. Cushman18, M. Daal14, F. DeJongh3, P. Di Stefano6, M. R. Dragowsky2, L. Duong18, S. Fallows18, E. Figueroa-Feliciano5, J. Filippini1, J. Fox6, M. Fritts18, S. R. Golwala1, J. Hall3, R. Hennings-Yeomans2, S. A. Hertel5, D. Holmgren3, L. Hsu3, M. E. Huber16, O. Kamaev18, M. Kiveni12, M. Kos12, S. W. Leman5, S. Liu6, R. Mahapatra13, V. Mandic18, K. A. McCarthy5, N. Mirabolfathi14, D. Moore1,*, H. Nelson15, R. W. Ogburn11, A. Phipps14, M. Pyle11, X. Qiu18, E. Ramberg3, W. Rau6, A. Reisetter18,8, R. Resch7, T. Saab17, B. Sadoulet4,14, J. Sander15, R. W. Schnee12, D. N. Seitz14, B. Serfass14, K. M. Sundqvist14, M. Tarka19, P. Wikus5, S. Yellin11,15, J. Yoo3, B. A. Young9, and J. Zhang18 (CDMS Collaboration)
1Division of Physics, Mathematics & Astronomy, California Institute of Technology, Pasadena, California 91125, USA
2Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA
3Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
4Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
5Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
6Department of Physics, Queen’s University, Kingston, ON, Canada, K7L 3N6
7SLAC National Accelerator Laboratory/KIPAC, Menlo Park, California 94025, USA
8Department of Physics, St. Olaf College, Northfield, Minnesota 55057 USA
9Department of Physics, Santa Clara University, Santa Clara, California 95053, USA
10Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA
11Department of Physics, Stanford University, Stanford, California 94305, USA
12Department of Physics, Syracuse University, Syracuse, New York 13244, USA
13Department of Physics, Texas A & M University, College Station, Texas 77843, USA
14Department of Physics, University of California, Berkeley, California 94720, USA
15Department of Physics, University of California, Santa Barbara, California 93106, USA
16Departments of Physics & Electrical Engineering, University of Colorado Denver, Denver, Colorado 80217, USA
17Department of Physics, University of Florida, Gainesville, Florida 32611, USA
18School of Physics & Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
19Physics Institute, University of Zürich, Winterthurerstrasse 190, CH-8057, Switzerland
Received 24 November 2010; published 30 March 2011
We report results from a reanalysis of data from the Cryogenic Dark Matter Search (CDMS II) experiment at the Soudan Underground Laboratory. Data taken between October 2006 and September 2008 using eight germanium detectors are reanalyzed with a lowered, 2 keV recoil-energy threshold, to give increased sensitivity to interactions from weakly interacting massive particles (WIMPs) with masses below ∼10 GeV/c2. This analysis provides stronger constraints than previous CDMS II results for WIMP masses below 9 GeV/c2 and excludes parameter space associated with possible low-mass WIMP signals from the DAMA/LIBRA and CoGeNT experiments.
© 2011 American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.106.131302
DOI:
10.1103/PhysRevLett.106.131302
*Corresponding author. davidm@caltech.edu
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