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Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess
Physical Review Letters ( IF 8.6 ) Pub Date : 2020-10-12 , DOI: 10.1103/physrevlett.125.161805
Joseph Bramante , Ningqiang Song

The identity of dark matter is being sought with increasingly sensitive and voluminous underground detectors. Recently the XENON1T Collaboration reported excess electronic recoil events, with most of these having recoil energies around 1–30 keV. We show that a straightforward model of inelastic dark matter produced via early Universe thermal freeze-out annihilation can account for the XENON1T excess. Remarkably, this dark matter model consists of a few simple elements: sub-GeV mass Dirac fermion dark matter coupled to a lighter dark photon kinetically mixed with the standard model photon. A scalar field charged under the dark U(1) gauge symmetry can provide a mass for the dark photon and splits the Dirac fermion component state masses by a few keV, which survive in equal abundance and interact inelastically with electrons and nuclei.

中文翻译:

电动但不折衷:XENON1T过多的热量遗物

越来越敏感和大量的地下探测器正在寻找暗物质的身份。最近,XENON1T合作组织报告了过多的电子反冲事件,其中大多数具有约1–30 keV的反冲能量。我们表明,通过早期宇宙热冻结an灭产生的无弹性暗物质的简单模型可以解释XENON1T的过量。值得注意的是,该暗物质模型由几个简单元素组成:次GeV质量狄拉克费米子暗物质与与标准模型光子动力学混合的较轻暗光子耦合。在暗U(1)规范对称下带电的标量场可以为暗光子提供质量,并以几个keV分裂狄拉克费米子分量态质量,这些keV以相同的丰度存活并与电子和原子核发生非弹性相互作用。
更新日期:2020-10-12
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