Analysis of the low-energy electron-recoil spectrum of the CDMS experiment
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Ahmed-2010-Analysis of the low-.pdf
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Author(s)
Leman, Steven W.
Wikus, Patrick
McCarthy, Kevin Ahmad
Hertel, Scott Alexander
Figueroa-Feliciano, Enectali
Date Issued
February 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
CDMS Collaboration et al. “Analysis of the low-energy electron-recoil spectrum of the CDMS experiment.” Physical Review D 81.4 (2010): 042002. © 2010 The American Physical Society.
Version
Final published version
Abstract
We report on the analysis of the low-energy electron-recoil spectrum from the CDMS II experiment using data with an exposure of 443.2 kg-days. The analysis provides details on the observed counting rate and possible background sources in the energy range of 2–8.5 keV. We find no significant excess of a peaked contribution to the total counting rate above the background model, and compare this observation to the recent DAMA results. In the framework of a conversion of a dark matter particle into electromagnetic energy, our 90% confidence level upper limit of 0.246 events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z2 scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. Under the conservative assumption that the modulation amplitude is 6% of the total rate we obtain upper limits on the modulation amplitude a factor of ∼2 lower than observed by DAMA, constraining some possible interpretations of this modulation.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.81.042002
