发表机构
University of Science and Technology of China; Purple Mountain Observatory, Chinese Academy of Sciences; The Chinese University of Hong Kong（中国科学技术大学; 中国科学院紫金山天文台; 香港中文大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出用轴子类似粒子介导的马约拉纳暗物质非弹性散射解释LZ实验的高能候选事件LZ230616，通过单事件似然分析确定了质量劈裂和耦合条件，为后续验证奠定基础。
AI 中文摘要
LUX-ZEPLIN（LZ）合作组报告了一个高能候选事件LZ230616，其重建核反冲能量为$E_R=248\pm23_{\rm stat}\pm23_{\rm sys}~{\rm keV}$。我们研究了一种可能的解释，即两个马约拉纳暗物质态之间通过耦合到胶子的轴子类似粒子介导的非弹性散射。正的质量劈裂抑制了低能反冲，而相互作用的动量依赖性重塑了高能谱。我们独立处理暗扇区和胶子耦合，并保留动量相关的核子形状因子和氙核响应。使用近似的单事件似然，我们发现，对于$m_a=0.3~{\rm GeV}$，在$m_\chi\simeq0.35~{\rm TeV}$和$\delta\simeq330~{\rm keV}$处，候选能量附近出现窄谱，尽管该配置需要较大的耦合乘积且对银河系晕速度截断高度敏感。我们的分析确立了后续测试所需的运动学和耦合要求，这些测试将利用热遗迹丰度和对中介子的实验室约束。
英文摘要
The LUX-ZEPLIN (LZ) Collaboration has reported a high-energy candidate event LZ230616 with a reconstructed nuclear recoil energy $E_R=248\pm23_{\rm stat}\pm23_{\rm sys}~{\rm keV}$. We investigate a possible interpretation in terms of inelastic scattering between two Majorana dark matter states mediated by an axionlike particle coupled to gluons. The positive mass splitting suppresses low-energy recoils, while the momentum dependence of the interaction reshapes the high-energy spectrum. We treat the dark-sector and gluonic couplings independently and retain the momentum-dependent nucleon form factors and xenon nuclear responses. Using an approximate single-event likelihood, we find that, for $m_a=0.3~{\rm GeV}$, a narrow spectrum near the candidate energy arises at $m_χ\simeq0.35~{\rm TeV}$ and $δ\simeq330~{\rm keV}$, although this configuration requires a large coupling product and is highly sensitive to the Galactic halo speed cutoff. Our analysis establishes the kinematic and coupling requirements for subsequent tests using the thermal relic abundance and laboratory constraints on the mediator.
Comments7 pages, 3 figures
