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Exclusion limits on the WIMP-nucleon cross section from the Cryogenic Dark Matter Search

Abrams, D. and Akerib, D. S. and Armel-Funkhouser, M. S. and Baudis, L. and Bauer, D. A. and Bolozdynya, A. and Brink, P. L. and Bunker, R. and Cabrera, B. and Caldwell, D. O. and Castle, J. P. and Chang, C. L. and Clarke, R. M. and Crisler, M. B. and Dixon, R. and Driscoll, D. and Eichblatt, S. and Gaitskell, R. J. and Golwala, S. R. and Haller, E. E. and Hellmig, J. and Holmgren, D. and Huber, M. E. and Kamat, S. and A. Lu, S. and Mandic, V. and Martinis, J. M. and Meunier, P. and Nam, S. W. and Nelson, H. and Perera, T. A. and Perillo Isaac, M. C. and Rau, W. and Ross, R. R. and Saab, T. and Sadoulet, B. and Sander, J. and Schnee, R. W. and Shutt, T. and Smith, A. and Sonnenschein, A. H. and Spadafora, A. L. and Wang, G. and Yellin, S. and Young, B. A. and CDMS, Collaboration (2002) Exclusion limits on the WIMP-nucleon cross section from the Cryogenic Dark Matter Search. Physical Review D, 66 (12). Art. No. 122003. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:ABRprd02

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Abstract

The Cryogenic Dark Matter Search (CDMS) employs low-temperature Ge and Si detectors to search for weakly interacting massive particles (WIMPs) via their elastic-scattering interactions with nuclei while discriminating against interactions of background particles. For recoil energies above 10 keV, events due to background photons are rejected with >99.9% efficiency, and surface events are rejected with >95% efficiency. The estimate of the background due to neutrons is based primarily on the observation of multiple-scatter events that should all be neutrons. Data selection is determined primarily by examining calibration data and vetoed events. Resulting efficiencies should be accurate to ∼10%. Results of CDMS data from 1998 and 1999 with a relaxed fiducial-volume cut (resulting in 15.8 kg days exposure on Ge) are consistent with an earlier analysis with a more restrictive fiducial-volume cut. Twenty-three WIMP candidate events are observed, but these events are consistent with a background from neutrons in all ways tested. Resulting limits on the spin-independent WIMP-nucleon elastic-scattering cross section exclude unexplored parameter space for WIMPs with masses between 10–70 GeV/c2. These limits border, but do not exclude, parameter space allowed by supersymmetry models and accelerator constraints. Results are compatible with some regions reported as allowed at 3σ by the annual-modulation measurement of the DAMA Collaboration. However, under the assumptions of standard WIMP interactions and a standard halo, the results are incompatible with the DAMA most likely value at >99.9% confidence level (C.L.), and are incompatible with the model-independent annual-modulation signal of DAMA at 99.99% C.L. in the asymptotic limit.


Item Type:Article
Additional Information:©2002 The American Physical Society. Received 29 March 2002; published 20 December 2002. We thank Paul Luke of LBNL for his advice regarding surface-event rejection. We thank R. Abusaidi, J. Emes, D. Hale, G.W. Smith, J. Taylor, S. White, D.N. Seitz, J. Perales, M. Hennessy, M. Haldeman, and the rest of the engineering and technical staffs at our respective institutions for invaluable support. This work is supported by the Center for Particle Astrophysics, an NSF Science and Technology Center operated by the University of California, Berkeley, under Cooperative Agreement No. AST-91-20005, by the National Science Foundation under Grant No. PHY-9722414, by the Department of Energy under contracts DE-AC03-76SF00098, DE-FG03-90ER40569, DE-FG03-91ER40618, and by Fermilab, operated by the Universities Research Association, Inc., under Contract No. DE-AC02-76CH03000 with the Department of Energy.
Subject Keywords:LOW-RADIOACTIVITY; PHONON PRODUCTION; 25 MK; IONIZATION; DETECTOR; GERMANIUM; VOLTAGE; CRYSTAL
Record Number:CaltechAUTHORS:ABRprd02
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ABRprd02
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.66.122003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3791
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:11 Jul 2006
Last Modified:26 Dec 2012 08:56

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