论文标题
非弹性暗物质电子散射和异种1T多余
Inelastic Dark Matter Electron Scattering and the XENON1T Excess
论文作者
论文摘要
通过暗物质（DM）检测电子后坐力可能揭示了暗区域的结构。我们考虑了一种场景，其中较重的DM粒子无弹性地从电子中散射并转化为较轻的DM粒子。两个DM颗粒之间的质量差很小，将其转移到电子后坐力能量中。我们研究了由大型深色光子介导的DM电子相互作用，并考虑了原子结构，评估了非弹性DM散射率。发现由于质量分裂较小，散射速率显着提高，这使得与电子波函数大小相匹配的小动量转移。我们表明，存在一个可行的参数空间，该空间解释了Xenon1t实验最近报道的2-3 KEV附近的电子后坐力事件的过量。
Detection of electron recoils by dark matter (DM) may reveal the structure of the dark sector. We consider a scenario where a heavier DM particle inelastically scatters off an electron and is converted into a lighter DM particle. A small mass difference between the two DM particles is transferred into electron recoil energy. We investigate the DM-electron interaction mediated by a massive dark photon and evaluate the inelastic DM scattering rate, taking account of the atomic structure. It is found that the scattering rate is significantly enhanced because of the small mass splitting, which allows for a small momentum transfer matched with the size of the electron wave function. We show that there exists a viable parameter space which explains the excess of electron recoil events around 2-3 keV recently reported by the XENON1T experiment.
