来自LUX-ZEPLIN高能事件的季节暗物质
Seasonal dark matter from the LUX-ZEPLIN high-energy event
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中文总结 AI 辅助
本文针对LUX-ZEPLIN实验观测到的高能核反冲事件，提出非弹性暗物质解释，其信号具有极强的年度调制特性，未来XLZD、PandaX等大质量靶实验可直接验证该结论。
中文摘要 AI 辅助
LUX-ZEPLIN实验在扩展搜索窗口中报告了一个在248±23（统计）±23（系统）keV处的单次核反冲事件。非弹性暗物质是一种散射为吸热过程的暗物质模型，是产生如此高能量信号的自然机制。我们将该事件拟合到暗物质质量与两个暗物质态之间的质量差，发现数据支持的质量差接近暗物质晕逃逸速度设定的运动学极限，该信号由暗物质晕速度分布尾部的暗物质提供，这会产生极强的季节信号：在参数空间的 favored 区域，年度调制幅度超过50%，部分参数下甚至达到100%，意味着该信号在一年中的部分时间会消失。如此强的调制特征与非调制信号截然不同，我们量化了证实该特征所需的事件数。目标质量比LZ更大的实验，特别是XLZD和PandaX，将能够直接检验这一结论。
英文摘要
The LUX-ZEPLIN experiment has reported a single nuclear recoil at $248\pm23({\rm stat})\pm23({\rm sys})\keV$ in an extended search window. Inelastic dark matter, in which the scattering is endothermic, is a natural mechanism for producing a signal at such high energy. We fit the event to the dark matter mass and the mass splitting between two dark matter states, and find that the data favour a splitting pushed close to the kinematic limit set by the escape speed of the halo. The signal is then supplied by dark matter in the tail of the halo speed distribution. This drives a strongly seasonal signal: annual modulation rises above $50\%$ across the favoured region of parameter space and even reaches $100\%$ for some parameters, implying the signal vanishes for part of the year. Such a strong modulation distinguishes this interpretation sharply from a non-modulating signal, and we quantify the number of events needed to establish it. Experiments with larger target masses than LZ's, notably XLZD and PandaX, will be able to test this directly.
发表机构
- King’s College London（伦敦国王学院）
机构由 AI 辅助整理，请以论文原文为准。
