Silicon Detector Dark Matter Results from the Final Exposure of CDMS II

被引：406

作者：

Agnese, R. ^{[19
]}

Ahmed, Z. ^{[1
]}

Anderson, A. J. ^{[4
]}

Arrenberg, S. ^{[21
]}

Balakishiyeva, D. ^{[19
]}

Thakur, R. Basu ^{[2
]}

Bauer, D. A. ^{[2
]}

Billard, J. ^{[15
]}

Borgland, A. ^{[8
]}

Brandt, D. ^{[8
]}

Brink, P. L. ^{[8
]}

Bruch, T. ^{[21
]}

Bunker, R. ^{[11
]}

Cabrera, B. ^{[10
]}

Caldwell, D. O. ^{[16
]}

Cerdeno, D. G. ^{[13
,14
]}

Chagani, H. ^{[20
]}

Cooley, J. ^{[9
]}

Cornell, B. ^{[1
]}

Crewdson, C. H. ^{[6
]}

Cushman, P. ^{[20
]}

Daal, M. ^{[15
]}

Dejongh, F. ^{[2
]}

do Couto e Silva, E. ^{[8
]}

Doughty, T. ^{[15
]}

Esteban, L. ^{[13
,14
]}

Fallows, S. ^{[20
]}

Figueroa-Feliciano, E. ^{[4
]}

Filippini, J. ^{[1
]}

Fox, J. ^{[6
]}

Fritts, M. ^{[20
]}

Godfrey, G. L. ^{[8
]}

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

Hall, J. ^{[5
]}

Harris, R. H. ^{[12
]}

Hertel, S. A. ^{[4
]}

Hofer, T. ^{[20
]}

Holmgren, D. ^{[2
]}

Hsu, L. ^{[2
]}

Huber, M. E. ^{[17
]}

Jastram, A. ^{[12
]}

Kamaev, O. ^{[6
]}

Kara, B. ^{[9
]}

Kelsey, M. H. ^{[8
]}

Kennedy, A. ^{[20
]}

Kim, P. ^{[8
]}

Kiveni, M. ^{[11
]}

Koch, K. ^{[20
]}

Kos, M. ^{[11
]}

Leman, S. W. ^{[4
]}

机构：

[1] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

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

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

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

[5] Pacific NW Natl Lab, Richland, WA 99352 USA

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

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

[8] Kavli Inst Particle Astrophys & Cosmol, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[9] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA

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

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

[12] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[13] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain

[14] Univ Autonoma Madrid, Inst Fis Teor UAM CSIC, E-28049 Madrid, Spain

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

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

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

[18] Univ Evansville, Dept Phys, Evansville, IN 47722 USA

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

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

[21] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 25期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会; 美国能源部;

关键词：

D O I：

10.1103/PhysRevLett.111.251301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons and Pb-206 are limited to <0.13 and <0.08 events at the 90% confidence level, respectively. The exposure of this analysis is equivalent to 23.4 kg day for a recoil energy range of 7-100 keV for a WIMP of mass 10 GeV/c(2). The probability that the known backgrounds would produce three or more events in the signal region is 5.4%. A profile likelihood ratio test of the three events that includes the measured recoil energies gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP + background hypothesis. The highest likelihood occurs for a WIMP mass of 8.6 GeV/c(2) and WIMP-nucleon cross section of 1.9 x 10(-41) cm(2).

引用

页数：6

共 36 条

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