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Weakly interacting massive particle annual modulation signal and nonstandard halo models

Weakly interacting massive particle annual modulation signal and nonstandard halo models Currently the best prospect for detecting weakly interacting massive particles (WIMPs) is via the annual modulation, which occurs due to the Earth’s rotation around the Sun, of the direct detection signal. We investigate the effect of uncertainties in our knowledge of the structure of the galactic halo on the WIMP annual modulation signal. We compare the signal for three non-standard halo models: Evans’ power-law halos, Michie models with an asymmetric velocity distribution and Maxwellian halos with bulk rotation. We then compare the theoretical predictions of these models with the experimental signal found by the DAMA experiment and investigate how the WIMP mass and interaction cross section determined depend on the halo model assumed. We find that the WIMP mass confidence limits are significantly extended to larger masses, with the shape of the allowed region in the mass–cross-section plane depending on the model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Weakly interacting massive particle annual modulation signal and nonstandard halo models

Physical Review D , Volume 63 (4) – Feb 15, 2001
6 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2001 The American Physical Society
ISSN
1089-4918
DOI
10.1103/PhysRevD.63.043005
Publisher site
See Article on Publisher Site

Abstract

Currently the best prospect for detecting weakly interacting massive particles (WIMPs) is via the annual modulation, which occurs due to the Earth’s rotation around the Sun, of the direct detection signal. We investigate the effect of uncertainties in our knowledge of the structure of the galactic halo on the WIMP annual modulation signal. We compare the signal for three non-standard halo models: Evans’ power-law halos, Michie models with an asymmetric velocity distribution and Maxwellian halos with bulk rotation. We then compare the theoretical predictions of these models with the experimental signal found by the DAMA experiment and investigate how the WIMP mass and interaction cross section determined depend on the halo model assumed. We find that the WIMP mass confidence limits are significantly extended to larger masses, with the shape of the allowed region in the mass–cross-section plane depending on the model.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Feb 15, 2001

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