CDMS II 最终曝光的硅探测器暗物质结果
高能物理 - 实验
2013-10-15 v3 宇宙学与河外天体物理
天体物理仪器与方法
仪器与探测器
摘要
我们报告了利用 CDMS II 实验的硅探测器搜寻弱相互作用大质量粒子（WIMPs）的结果。这项对 2007 年 7 月至 2008 年 9 月期间采集的 140.2 kg-days 数据的盲分析揭示了三个 WIMP 候选事件，其表面事件背景估计为 0.41^{+0.20}_{-0.08}(stat.)^{+0.28}_{-0.24}(syst.)。来自中子和 206Pb 的其他已知背景在 90% 置信水平下分别被限制为 < 0.13 和 < 0.08 个事件。对于质量为 10 GeV/c2 的 WIMP，在 7-100 keV 的反冲能范围内，该分析的曝光量相当于 23.4 kg-days。已知背景在信号区产生三个或更多事件的概率为 5.4%。对这三个事件进行包含测量反冲能的轮廓似然比检验，在与备择的 WIMP+背景假设进行比较时，已知背景-only 假设的概率为 0.19%。最大似然出现在 WIMP 质量为 8.6 GeV/c2 且 WIMP-核子截面为 1.9e-41 cm2 时。
引用
@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}
}
备注
5 pages, 4 figures, as accepted by PRL