Electromagnetic signals of inelastic dark matter scattering
Electromagnetic signals of inelastic dark matter scattering
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DOI：
10.1007/jhep06(2022)047
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发表时间：
2020-06
影响因子：
5.4
通讯作者：
M. Baryakhtar;A. Berlin;Hongwan Liu;N. Weiner
中科院分区：
文献类型：
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作者：
M. Baryakhtar;A. Berlin;Hongwan Liu;N. Weiner
与标准模型热接触的亮暗扇区可以自然地产生观测到的遗迹暗物质丰度，并且是广泛的实验搜索计划的目标。一个关键的亮暗扇形模型是带有暗光子介质的伪狄拉克费米子。费米子激发态的动力学常被忽略。我们考虑的情况下，一个非平凡的丰富的激发态的产生和随后的去激发产生有趣的电磁信号在直接检测实验。我们研究了三种机制的人口的激发态：一个原始的激发部分，一个组件在太阳上散射，和一个组件在地球上散射。我们发现，分数丰度的原始激发态一般消耗指数小分数在早期宇宙。尽管如此，这种丰度可以在目前的暗物质搜索中产生可观察到的信号。具有热截面和更高热截面的MeV级暗物质可以通过在太阳中激发后的向下散射来探测。地球中GeV级暗物质的向上散射可以在当前和即将进行的地面实验和X射线观测中产生信号。我们评论这些情况可能与最近XENON1T过剩有关。
Light dark sectors in thermal contact with the Standard Model can naturally produce the observed relic dark matter abundance and are the targets of a broad experimental search program. A key light dark sector model is the pseudo-Dirac fermion with a dark photon mediator. The dynamics of the fermionic excited states are often neglected. We consider scenarios in which a nontrivial abundance of excited states is produced and their subsequent de-excitation yields interesting electromagnetic signals in direct detection experiments. We study three mechanisms of populating the excited state: a primordial excited fraction, a component up-scattered in the Sun, and a component up-scattered in the Earth. We find that the fractional abundance of primordial excited states is generically depleted to exponentially small fractions in the early universe. Nonetheless, this abundance can produce observable signals in current dark matter searches. MeV-scale dark matter with thermal cross sections and higher can be probed by down-scattering following excitation in the Sun. Up-scatters of GeV-scale dark matter in the Earth can give rise to signals in current and upcoming terrestrial experiments and X-ray observations. We comment on the possible relevance of these scenarios to the recent excess in XENON1T.