Millicharged cosmic rays and low recoil detectors
Millicharged cosmic rays and low recoil detectors
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DOI：
10.1103/physrevd.103.075029
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发表时间：
2020-10
影响因子：
5
通讯作者：
R. Harnik;R. Plestid;M. Pospelov;H. Ramani
中科院分区：
文献类型：
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作者：
R. Harnik;R. Plestid;M. Pospelov;H. Ramani
我们认为生产的“快通量”的假设millicharged粒子（mCPs）在星际介质（ISM）。我们考虑两个可能的来源诱导的宇宙射线：（a）$pp\rightarrow$（介子）$\rightarrow$（mCP），这增加了大气生产的mCP，和（B）宇宙射线上散射的一个millicharged组件的暗物质。我们注意到，银河磁场保留mCP很长一段时间，导致增强的快通量的许多数量级。在这两种情况下，我们计算的直接暗物质探测的电子反冲的预期信号。我们观察到，在场景（a）中微子探测器（ArgoNeuT和Super-Kamiokande）仍然提供上级灵敏度相比，暗物质探测器（XENON 1 T）。然而，在暗物质成分增强的情况下，暗物质探测器的性能更好，因为在低速下上散射通量的增强。考虑到通量产生模型和导致电子反冲的实际原子物理学的不确定性，XENON 1 T报告的过量仍然有可能来自快速mCP通量，这将在未来的实验中进行决定性的测试。
We consider the production of a "fast flux" of hypothetical millicharged particles (mCPs) in the interstellar medium (ISM). We consider two possible sources induced by cosmic rays: (a) $pp\rightarrow$(meson)$\rightarrow$(mCP) which adds to atmospheric production of mCPs, and (b) cosmic-ray up-scattering on a millicharged component of dark matter. We notice that the galactic magnetic fields retain mCPs for a long time, leading to an enhancement of the fast flux by many orders of magnitude. In both scenarios, we calculate the expected signal for direct dark matter detection aimed at electron recoil. We observe that in Scenario (a) neutrino detectors (ArgoNeuT and Super-Kamiokande) still provide superior sensitivity compared to dark matter detectors (XENON1T). However, in scenarios with a boosted dark matter component, the dark matter detectors perform better, given the enhancement of the upscattered flux at low velocities. Given the uncertainties, both in the flux generation model and in the actual atomic physics leading to electron recoil, it is still possible that the XENON1T-reported excess may come from a fast mCP flux, which will be decisively tested with future experiments.