Analysis of the low-energy electron-recoil spectrum of the CDMS experiment
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 o...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/57495 https://orcid.org/0000-0001-9285-5556 |
| _version_ | 1811077530199785472 |
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| author | Leman, Steven W. Wikus, Patrick McCarthy, Kevin Ahmad Hertel, Scott Alexander Figueroa-Feliciano, Enectali |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Leman, Steven W. Wikus, Patrick McCarthy, Kevin Ahmad Hertel, Scott Alexander Figueroa-Feliciano, Enectali |
| author_sort | Leman, Steven W. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:44:29Z |
| format | Article |
| id | mit-1721.1/57495 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:44:29Z |
| publishDate | 2010 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/574952022-09-27T14:38:29Z Analysis of the low-energy electron-recoil spectrum of the CDMS experiment Leman, Steven W. Wikus, Patrick McCarthy, Kevin Ahmad Hertel, Scott Alexander Figueroa-Feliciano, Enectali Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Leman, Steven W. Leman, Steven W. Wikus, Patrick McCarthy, Kevin Ahmad Hertel, Scott Alexander Figueroa-Feliciano, Enectali 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. National Science Foundation ((Grant Nos. AST-9978911, PHY-0542066, PHY-0503729, PHY-0503629, PHY-0503641, PHY- 0504224, PHY-0705052, PHY-0801536, PHY-0801708, PHY-0801712 and PHY-0802575) United States Department of Energy (Contracts DE-AC03-76SF00098, DE-FG02- 91ER40688, DE-FG02-92ER40701, DE-FG03- 90ER40569, and DE-FG03-91ER40618) Swiss National Science Foundation (SNF Grant No. 20-118119) 2010-08-12T18:08:51Z 2010-08-12T18:08:51Z 2010-02 2009-11 Article http://purl.org/eprint/type/JournalArticle 1550-7998 http://hdl.handle.net/1721.1/57495 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. https://orcid.org/0000-0001-9285-5556 en_US http://dx.doi.org/10.1103/PhysRevD.81.042002 Physical Review D 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. application/pdf American Physical Society APS |
| spellingShingle | Leman, Steven W. Wikus, Patrick McCarthy, Kevin Ahmad Hertel, Scott Alexander Figueroa-Feliciano, Enectali Analysis of the low-energy electron-recoil spectrum of the CDMS experiment |
| title | Analysis of the low-energy electron-recoil spectrum of the CDMS experiment |
| title_full | Analysis of the low-energy electron-recoil spectrum of the CDMS experiment |
| title_fullStr | Analysis of the low-energy electron-recoil spectrum of the CDMS experiment |
| title_full_unstemmed | Analysis of the low-energy electron-recoil spectrum of the CDMS experiment |
| title_short | Analysis of the low-energy electron-recoil spectrum of the CDMS experiment |
| title_sort | analysis of the low energy electron recoil spectrum of the cdms experiment |
| url | http://hdl.handle.net/1721.1/57495 https://orcid.org/0000-0001-9285-5556 |
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