CDMS实验的低能电子反冲谱分析
Analysis of the low-energy electron-recoil spectrum of the CDMS experiment
摘要：
我们报告的低能量电子反冲光谱的CDMS II实验使用的数据与曝光443.2千克-天的分析。该分析提供了在2 - 8.5 keV的能量范围内观察到的计数率和可能的背景源的细节。我们没有发现显着的过量的计数率高于背景，并比较这一观察到最近的DAMA结果。在暗物质粒子转化为电磁能的框架内，我们在3.15 keV下的90%置信水平上限为0.246事件/kg/天，比DAMA观察到的高于背景的总速率低8.9 $σ$。在没有任何特定的粒子物理模型来提供NaI和Ge之间截面的标度的情况下，我们假设是Z ^2标度。根据该假设，DAMA中观察到的速率与CDMS中的上限相差6.8 $σ$。在保守的假设下，调制幅度是总速率的6%，我们得到的调制幅度的上限的一个因素的~2小于观察到的DAMA，约束这种调制的一些可能的解释。
英文摘要：
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 in the counting rate above background, 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 by 8.9$σ$. 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 differs from the upper limit in CDMS by 6.8$σ$. 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 ~2 less than observed by DAMA, constraining some possible interpretations of this modulation.
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