Analysis of the low-energy electron-recoil spectrum of the CDMS experiment - INSPIRE

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Analysis of the low-energy electron-recoil spectrum of the CDMS experiment

CDMS

Collaboration

•

Z. Ahmed
(
- Caltech
)

Jul, 2009

4 pages

Published in:

Phys.Rev.D 81 (2010) 042002

e-Print:

0907.1438 [astro-ph.GA]

DOI:

10.1103/PhysRevD.81.042002

Report number:

FERMILAB-PUB-09-340-E

Experiments:

CDMS

View in:

reference search55 citations

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Abstract: (arXiv)

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 in the counting rate above background, 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 by 8.9

\sigma

. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z^2 scaling. With this assumption the observed rate in DAMA differs from the upper limit in CDMS by 6.8

\sigma

. 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 less than observed by DAMA, constraining some possible interpretations of this modulation.

85.25.Oj
29.40.-n
95.30.Cq
29.40.Wk
OSG : CDMS

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