CDMS浅场数据的低阈值分析
Low-threshold analysis of CDMS shallow-site data
摘要：
低温暗物质搜索（CDMS II）探测器第一塔在最后一次浅层运行期间采集的数据已被重新分析，对小能量沉积的灵敏度有所提高。2001年12月至2002年6月期间，在斯坦福地下设施（SUF）运行了4个~224 g锗探测器和2个~105 g硅探测器，产生了118天的原始暴露。三个锗和两个硅探测器进行了分析与一种新的低阈值技术，使之有可能降低锗和硅的分析阈值下降到实际的触发阈值的~1 keV和~2 keV，分别。基于这些数据，弱相互作用大质量粒子（WIMP）从核弹性散射的自旋无关截面的极限排除了质量低于9 GeV/c^2的WIMP的有趣参数空间。在标准的晕假设下，这些数据部分排除了将DAMA/LIBRA和CoGeNT实验数据解释为WIMP信号的参数空间，也排除了WIMP质量在3 GeV/c^2和4 GeV/c^2之间的新参数空间。
英文摘要：
Data taken during the final shallow-site run of the first tower of the Cryogenic Dark Matter Search (CDMS II) detectors have been reanalyzed with improved sensitivity to small energy depositions. Four ~224 g germanium and two ~105 g silicon detectors were operated at the Stanford Underground Facility (SUF) between December 2001 and June 2002, yielding 118 live days of raw exposure. Three of the germanium and both silicon detectors were analyzed with a new low-threshold technique, making it possible to lower the germanium and silicon analysis thresholds down to the actual trigger thresholds of ~1 keV and ~2 keV, respectively. Limits on the spin-independent cross section for weakly interacting massive particles (WIMPs) to elastically scatter from nuclei based on these data exclude interesting parameter space for WIMPs with masses below 9 GeV/c^2. Under standard halo assumptions, these data partially exclude parameter space favored by interpretations of the DAMA/LIBRA and CoGeNT experiments' data as WIMP signals, and exclude new parameter space for WIMP masses between 3 GeV/c^2 and 4 GeV/c^2.
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