直接暗物质散射的最佳接收区
Optimum Acceptance Regions for Direct Dark Matter Searches
摘要：
大多数研究WIMP暗物质与目标直接相互作用的实验都能根据一些判别参数区分出占主导地位的电子反冲背景和核反冲信号。在由反冲能和这个鉴别参数构成的参数空间中定义了一个接受区。在此区域没有清晰信号的情况下，计算了暗物质散射截面的极限。在这里，提出了一种算法，允许定义的接受区域的先验，使实验具有最佳的灵敏度。这是通过对每个WIMP模型和要探测的WIMP质量进行优化的接受区域来实现的。使用最近的数据从CRESST-II实验作为anexample，它表明，由此产生的限制可以大大强于那些从传统的接受区域。在一个实验中，分割的目标，这里开发的算法可以产生不同的接受区域的各个子探测器。因此，它显示了如何在通常的最大间隙或最佳间隔框架内一致地组合数据。
英文摘要：
Most experiments that search for direct interactions of WIMP dark matter with a target can distinguish the dominant electronrecoil background from the nuclear recoil signal, based on some discrimination parameter. An acceptance region is defined inthe parameter space spanned by the recoil energy and this discrimination parameter. In the absence of a clear signal in thisregion, a limit is calculated on the dark matter scattering cross section. Here, an algorithm is presented that allows to define the acceptance region a priori such that the experiment has the best sensitivity. This is achieved through optimized acceptance regions for each WIMP model and WIMP mass that is to be probed. Using recent data from the CRESST-II experiment as anexample, it is shown that resulting limits can be substantially stronger than those from a conventional acceptance region. In an experiment with a segmented target, the algorithm developed here can yield different acceptance regions for the individual subdetectors. Hence, it is shown how to combine the data consistently within the usual Maximum Gap or Optimum Interval framework.
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