arXiv 2007.151912020-07-30hep-ph

XENON1T中的等离子体暗物质和电子反冲事件

Plasma dark matter and electronic recoil events in XENON1T

Lei Zu, R. Foot, Yi-Zhong Fan, Lei Feng

备注：: about 6 pages
DOI：: 10.1088/1475-7516/2021/01/070

摘要：

暗物质可能以暗等离子体的形式存在于银河系晕中。具体地说，我们在这里考虑一个隐藏的部门组成的轻“暗电子”和一个更重的“暗质子”，每一个收费下一个完整的$U(1)'$规范对称性。这些自相互作用的暗扇区粒子也可以通过动力学混合相互作用与普通物质相互作用，并在暗物质直接探测实验中产生信号。事实上，keV电子反冲可以很自然地出现在这样的模型从暗电子散射松散的原子电子。在这里，我们研究了最近报道的XENON1T过量的背景下，这样的等离子体暗物质模型。我们发现，如果动力学混合在大约范围内：$10^{-12} \lesssim ε\lesssim 10^{-10}$，则可以解释观察到的过量。允许的参数空间是一致的天体物理学和宇宙学的限制，也与其他直接检测实验。

英文摘要：

Dark matter might be in the form of a dark plasma in the Milky Way halo. Specifically, we consider here a hidden sector consisting of a light `dark electron' and a much heavier `dark proton', each charged under an unbroken $U(1)'$ gauge symmetry. These self-interacting dark sector particles can also interact with ordinary matter via the kinetic mixing interaction, and lead to a signal in dark matter direct detection experiments. Indeed, keV electron recoils can arise quite naturally in such models from dark electron scattering off loosely bound atomic electrons. Here we examine the recently reported XENON1T excess in the context of such a plasma dark matter model. We find that the observed excess can be explained if kinetic mixing is in the approximate range: $10^{-12} \lesssim ε\lesssim 10^{-10}$. The allowed parameter space is consistent with astrophysical and cosmological constraints and consistent also with other direct detection experiments.

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摘要：

英文摘要：

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