发表机构
Karlsruhe Institute of Technology (KIT); Henan Normal University; Institute of Theoretical Physics, Chinese Academy of Sciences; Nanjing Normal University（卡尔斯鲁厄理工学院; 河南师范大学; 中国科学院理论物理研究所; 南京师范大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文针对LUX-ZEPLIN观测的高能事例，用吸热型暗物质解释，给出所需参数并提出可通过CRESST升级检验该参数区域。
AI 中文摘要
LUX-ZEPLIN合作组近期公布，在2.84吨·年的曝光量下观测到1个反冲能$E_{\mathrm{nr}}=248\pm23~\mathrm{keV}$的事例。本文利用吸热型暗物质（DM）解释该特征，同时考虑了晕中存活基态组分的直接散射以及地球内上散射产生的激发态的贡献。计算表明，要解释这个高能事例，需要$m_\chi\gtrsim500~\mathrm{GeV}$和量级为300 keV的质量劈裂，此时地球内部激发态的产生在运动学上是禁戒的。对于$\bar{\sigma}_n=10^{-37}~\mathrm{cm^2}$，一个示例双bin似然分析给出代表性最佳拟合点为$(m_\chi,\delta)\simeq(1.105~\mathrm{TeV},350~\mathrm{keV})$，该偏好参数区域可通过计划中的CRESST升级进行检验。
英文摘要
The LUX--ZEPLIN Collaboration recently reported one event at $E_{\mathrm{nr}}=248\pm23~\mathrm{keV}$ with an exposure of $2.84~\mathrm{tonne\cdot yr}$. In this Letter, we interpret this feature using endothermic dark matter (DM). We consider both direct scattering of the surviving ground-state halo component and the contribution of excited states produced by terrestrial upscattering. Our calculations show that explaining the high-energy event requires $m_χ\gtrsim500~\mathrm{GeV}$ and a mass splitting of $\mathcal{O}(300)~\mathrm{keV}$, for which the production of excited states inside the Earth is kinematically forbidden. For $\barσ_n=10^{-37}~\mathrm{cm^2}$, an illustrative two-bin likelihood analysis yields a representative best-fit point at $(m_χ,δ)\simeq(1.105~\mathrm{TeV},350~\mathrm{keV})$. The preferred parameter region may be tested by the planned CRESST upgrade.
Comments7 pages, 4 figures
