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

被引：33

作者：

Ahmed, Z. ^{[1
]}

Akerib, D. S. ^{[2
]}

Arrenberg, S.

Bailey, C. N. ^{[2
]}

Balakishiyeva, D. ^{[16
]}

Baudis, L.

Bauer, D. A. ^{[3
]}

Beaty, J. ^{[17
]}

Brink, P. L. ^{[9
]}

Bruch, T.

Bunker, R. ^{[13
]}

Cabrera, B. ^{[9
]}

Caldwell, D. O. ^{[13
]}

Cooley, J. ^{[9
]}

Cushman, P. ^{[17
]}

DeJongh, F. ^{[3
]}

Dragowsky, M. R. ^{[2
]}

Duong, L. ^{[17
]}

Figueroa-Feliciano, E. ^{[5
]}

Filippini, J. ^{[1
,12
]}

Fritts, M. ^{[17
]}

Golwala, S. R. ^{[1
]}

Grant, D. R. ^{[2
]}

Hall, J. ^{[3
]}

Hennings-Yeomans, R. ^{[2
]}

Hertel, S. ^{[5
]}

Holmgren, D. ^{[3
]}

Hsu, L. ^{[3
]}

Huber, M. E. ^{[14
,15
]}

Kamaev, O. ^{[17
]}

Kiveni, M. ^{[10
]}

Kos, M. ^{[10
]}

Leman, S. W. ^{[5
]}

Mahapatra, R. ^{[11
]}

Mandic, V. ^{[17
]}

Moore, D. ^{[1
]}

McCarthy, K. A. ^{[5
]}

Mirabolfathi, N. ^{[12
]}

Nelson, H. ^{[13
]}

Ogburn, R. W. ^{[1
,9
]}

Pyle, M. ^{[9
]}

Qiu, X. ^{[17
]}

Ramberg, E. ^{[3
]}

Rau, W. ^{[6
]}

Reisetter, A. ^{[7
,17
]}

Saab, T. ^{[16
]}

Sadoulet, B. ^{[4
,12
]}

Sander, J. ^{[13
]}

Schnee, R. W. ^{[10
]}

Seitz, D. N. ^{[12
]}

机构：

[1] CALTECH, Dept Phys, Pasadena, CA 91125 USA

[2] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA

[3] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[5] MIT, Dept Phys, Cambridge, MA 02139 USA

[6] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada

[7] St Olaf Coll, Dept Phys, Northfield, MN 55057 USA

[8] Santa Clara Univ, Dept Phys, Santa Clara, CA 95053 USA

[9] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[10] Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA

[11] Texas A&M Univ, Dept Phys, College Stn, TX USA

[12] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[13] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[14] Univ Colorado Denver, Dept Phys, Denver, CO 80217 USA

[15] Univ Colorado Denver, Dept Elec Engr, Denver, CO 80217 USA

[16] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[17] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 04期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

DAMA/LIBRA;

D O I：

10.1103/PhysRevD.81.042002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 Z(2) 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 similar to 2 lower than observed by DAMA, constraining some possible interpretations of this modulation.

引用

页数：5

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