We show that the excess in electron recoil events seen by the XENON1T experiment can be explained by a relatively low-mass luminous dark matter candidate. The dark matter scatters inelastically in the detector (or the surrounding rock) to produce a heavier dark state with a $\sim 2–3\mathrm{keV}$ mass splitting. This heavier state then decays within the detector, producing a peak in the electron recoil spectrum that is a good fit to the observed excess. We comment on the ability of future direct detection experiments to differentiate this model from other “beyond the standard model” scenarios and from possible tritium backgrounds, including the use of diurnal modulation, multichannel signals, etc., as possible distinguishing features of this scenario.

中文翻译：

---

用发光的暗物质解释XENON1T剩余物

我们表明，XENON1T实验看到的电子反冲事件过多可以用相对较低质量的发光暗物质候选物来解释。暗物质在检测器（或周围的岩石）中无弹性地散射，从而产生较重的暗态，并且$〜2–3\mathrm{keV}$大规模分裂。然后，这种较重的状态在检测器内衰减，从而在电子反冲频谱中产生一个峰值，非常适合观察到的过量。我们对未来直接检测实验将这种模型与其他“超出标准模型”的情景以及可能的tri背景（包括使用昼夜调制，多通道信号等）的使用区分开的能力进行了评论，以此作为该场景的可能区别特征。