Boosted self-interacting dark matter and XENON1T excess
Boosted self-interacting dark matter and XENON1T excess
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增强自相互作用暗物质和 XENON1T 过剩
DOI：
10.1016/j.nuclphysb.2022.115787
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发表时间：
2021
影响因子：
2.8
通讯作者：
N. Sahu
中科院分区：
文献类型：
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作者：
D. Borah;Manoranjan Dutta;S. Mahapatra;N. Sahu
我们提出了一个自相互作用的增强暗物质（DM）的情况下，最近报道的过量的电子反冲事件的XENON1T实验的一个可能的解释。在暗U（1）D规范对称下，用两个带电的类矢量费米子单态来描述暗扇区，从而扩展了标准模型（SM）。虽然光矢量玻色子介体的存在导致足够的DM自相互作用来解决冷暗物质的小尺度问题，但具有亚GeV尺度DM的模型可以通过增强的DM分量与探测器处的电子的弹性散射来解释XENON1T过量。DM到光介质中的强烈湮灭导致抑制的热遗迹。暗冻结和标量晚期衰变的非热贡献的混合设置可以导致正确的遗迹丰度。我们用XENON1T数据拟合了我们的模型，并发现最终的参数空间与DM的自相互作用、DM-电子散射率以及天体物理和宇宙学观测结果一致。一个微小的参数空间符合所有这些限制和要求，可以在不久的将来的实验中进一步审查。
We present a self-interacting boosted dark matter (DM) scenario as a possible explanation of the recently reported excess of electron recoil events by the XENON1T experiment. The Standard Model (SM) has been extended with two vector-like fermion singlets charged under a dark U (1) D gauge symmetry to describe the dark sector. While the presence of light vector boson mediator leads to sufficient DM self-interactions to address the small scale issues of cold dark matter, the model with sub-GeV scale DM can explain the XENON1T excess via elastic scattering of boosted DM component with electrons at the detector. Strong annihilation of DM into the light mediator leads to a suppressed thermal relic. A hybrid setup of dark freeze-out and non-thermal contribution from the late decay of a scalar can lead to correct relic abundance. We fit our model with XENON1T data and also find the final parameter space consistent with self-interaction of DM, DM-electron scattering rate, as well as astrophysical and cosmological observations. A tiny parameter space consistent with all these constraints and requirements can be further scrutinized in near-future experiments.