利用LUX 2013年数据对镜像暗物质动力学混合的首次直接探测约束
First direct detection constraint on mirror dark matter kinetic mixing using LUX 2013 data
摘要：
我们提出了一个直接检测搜索镜像暗物质相互作用的结果，使用从大型地下氙实验在2013年期间收集的数据，与95活天$\times$ 118公斤的曝光。在这里，液态氙中的镜面电子散射率的计算考虑了地球内部捕获的镜面暗物质的屏蔽效应。年度和昼夜调制的暗物质通量和氙原子壳效应也占。没有发现任何证据表明镜像暗物质相互作用引起的电子反冲信号，我们将在0.1和0.6千电子伏之间的局部镜像电子温度范围内的动力学混合参数的上限。这一限制表明显着改善了以前的实验约束，从orthopositronium衰变，并显着减少了允许的参数空间的模型。我们排除镜像电子温度高于0.3千电子伏在90%的置信水平，对于这个模型，并限制动力学混合低于这个温度。
英文摘要：
We present the results of a direct detection search for mirror dark matter interactions, using data collected from the Large Underground Xenon experiment during 2013, with an exposure of 95 live-days $\times$ 118 kg. Here, the calculations of the mirror electron scattering rate in liquid xenon take into account the shielding effects from mirror dark matter captured within the Earth. Annual and diurnal modulation of the dark matter flux and atomic shell effects in xenon are also accounted for. Having found no evidence for an electron recoil signal induced by mirror dark matter interactions we place an upper limit on the kinetic mixing parameter over a range of local mirror electron temperatures between 0.1 and 0.6 keV. This limit shows significant improvement over the previous experimental constraint from orthopositronium decays and significantly reduces the allowed parameter space for the model. We exclude mirror electron temperatures above 0.3 keV at a 90% confidence level, for this model, and constrain the kinetic mixing below this temperature.
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