发表机构
National Institute of Chemical Physics and Biophysics; Dipartimento di Fisica dell’Università di Pisa（爱沙尼亚化学物理与生物物理国家研究所; 比萨大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对LZ实验248 keV核反冲异常事件，提出动量增强的弹性暗扇区粒子碰撞解释，采用赝标量算符，预测氩无信号、年调制低于1%，并在自旋丰富轻核产生反冲。
AI 中文摘要
LZ实验报告了一个核反冲能量为248 keV的异常事件。银河系晕暗物质（DM）除非质量大于74 GeV，否则无法产生如此大的能量，而具有自旋无关相互作用的较重暗物质本应在较低能量下产生未被观测到的反冲。非弹性暗物质曾被提出作为一种解决方案。我们转而考虑一个暗扇区粒子与动量至少为123 MeV、质量在1-74 GeV范围内的弹性碰撞，因为SNO实验中的氘核破裂不利于亚GeV质量。没有伴随的较低能量反冲，这有利于相互作用率随动量转移增加的情况，例如赝标量-赝标量核子算符。这意味着在氩中无领头阶信号，年调制低于1%，并且在自旋丰富轻核中产生反冲，而非弹性晕暗物质在这些核中不产生任何信号。
英文摘要
The LZ experiment reported one anomalous event with nuclear recoil energy of 248 keV. Galactic halo dark matter (DM) cannot produce such a large energy unless heavier than 74 GeV, and heavy DM with spin-independent interactions would have produced unseen recoils at lower energy. Inelastic DM has been proposed as a way out. We consider, instead, an elastic collision of a dark sector particle with a momentum of at least 123~MeV and mass in the range 1-74 GeV as deuteron break-up in SNO disfavors sub-GeV masses. The absence of accompanying lower-energy recoils favours interactions whose rate grows with the momentum transfer, such as a pseudoscalar-pseudoscalar nucleon operator. This implies no leading-order signal in argon, an annual modulation below 1 %, and recoils in spinful light nuclei where inelastic halo DM gives nothing.
Comments7 pages, 2 figures
