论文标题
Xenon1t过量的放热暗物质
Exothermic Dark Matter for XENON1T Excess
论文作者
论文摘要
由Xenon1t实验的电子后坐力最近过量的激励，我们考虑了放热暗物质的可能性，这是由两个具有质量分裂的状态组成的。较重的状态向下碎片将电子从电子状态降低到较轻的状态，即使对于标准的麦克斯韦速度分布，也需要适当的后坐力能量。因此，我们确定深色电子后坐力的两个组分状态在$ 2.5 \，{\ rm kev} $上的质量差异，{\ rm kev} $升至检测器分辨率，这是$ e_r = 2-3 \，{\ rm kev} $的后退事件，这是最重要的。我们包括相位增强的影响和原子激发因子，以计算Xenon过量的所需散射横截面。我们讨论了暗物质相互作用在有效理论中对放热暗物质和大量$ z'$介体的含义，并提供了微观模型，以实现所需的暗物质和电子耦合到$ z'$。
Motivated by the recent excess in the electron recoil from XENON1T experiment, we consider the possibility of exothermic dark matter, which is composed of two states with mass splitting. The heavier state down-scatters off the electron into the lighter state, making an appropriate recoil energy required for the Xenon excess even for the standard Maxwellian velocity distribution of dark matter. Accordingly, we determine the mass difference between two component states of dark matter to the peak electron recoil energy at about $2.5\,{\rm keV}$ up to the detector resolution, accounting for the recoil events over $E_R=2-3\,{\rm keV}$, which are most significant. We include the effects of the phase-space enhancement and the atomic excitation factor to calculate the required scattering cross section for the Xenon excess. We discuss the implications of dark matter interactions in the effective theory for exothermic dark matter and a massive $Z'$ mediator and provide microscopic models realizing the required dark matter and electron couplings to $Z'$.
