Silicon Detector Dark Matter Results from the Final Exposure of CDMS II
Abstract
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-days of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41^{+0.20}_{-0.08}(stat.)^{+0.28}_{-0.24}(syst.). Other known backgrounds from neutrons and 206Pb 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-days for a recoil energy range of 7-100 keV for a WIMP of mass 10 GeV/c2. 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/c2 and WIMP-nucleon cross section of 1.9e-41 cm2.
Keywords
Cite
@article{arxiv.1304.4279,
title = {Silicon Detector Dark Matter Results from the Final Exposure of CDMS II},
author = {CDMS Collaboration and R. Agnese and Z. Ahmed and A. J. Anderson and S. Arrenberg and D. Balakishiyeva and R. Basu Thakur and D. A. Bauer and J. Billard and A. Borgland and D. Brandt and P. L. Brink and T. Bruch and R. Bunker and B. Cabrera and D. O. Caldwell and D. G. Cerdeno and H. Chagani and J. Cooley and B. Cornell and C. H. Crewdson and P. Cushman and M. Daal and F. Dejongh and E. Do Couto E Silva and T. Doughty and L. Esteban and S. Fallows and E. Figueroa-Feliciano and J. Filippini and J. Fox and M. Fritts and G. L. Godfrey and S. R. Golwala and J. Hall and R. H. Harris and S. A. Hertel and T. Hofer and D. Holmgren and L. Hsu and M. E. Huber and A. Jastram and O. Kamaev and B. Kara and M. H. Kelsey and A. Kennedy and P. Kim and M. Kiveni and K. Koch and M. Kos and S. W. Leman and B. Loer and E. Lopez Asamar and R. Mahapatra and V. Mandic and C. Martinez and K. A. McCarthy and N. Mirabolfathi and R. A. Moffatt and D. C. Moore and P. Nadeau and R. H. Nelson and K. Page and R. Partridge and M. Pepin and A. Phipps and K. Prasad and M. Pyle and H. Qiu and W. Rau and P. Redl and A. Reisetter and Y. Ricci and T. Saab and B. Sadoulet and J. Sander and K. Schneck and R. W. Schnee and S. Scorza and B. Serfass and B. Shank and D. Speller and K. M. Sundqvist and A. N. Villano and B. Welliver and D. H. Wright and S. Yellin and J. J. Yen and J. Yoo and B. A. Young and J. Zhang},
journal= {arXiv preprint arXiv:1304.4279},
year = {2013}
}
Comments
5 pages, 4 figures, as accepted by PRL