Bell Nicole F, Dent James B, Dutta Bhaskar, Ghosh Sumit, Kumar Jason, Newstead Jayden L
ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Melbourne, Victoria 3010, Australia.
Department of Physics, Sam Houston State University, Huntsville, Texas 77341, USA.
Phys Rev Lett. 2020 Oct 16;125(16):161803. doi: 10.1103/PhysRevLett.125.161803.
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 ∼2-3 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.
我们表明，XENON1T实验观测到的电子反冲事件过量现象，可以由一个质量相对较低的发光暗物质候选者来解释。暗物质在探测器（或周围岩石）中发生非弹性散射，产生一个质量分裂约为2 - 3 keV的较重暗态。然后这个较重的态在探测器内衰变，在电子反冲谱中产生一个峰值，该峰值与观测到的过量现象拟合得很好。我们评论了未来直接探测实验将此模型与其他“超出标准模型”的情景以及可能的氚背景区分开来的能力，包括利用日调制、多通道信号等作为该情景可能的区分特征。
