LZ实验中的放热暗物质
Exothermic Dark Matter at LZ
- University of Pittsburgh（匹兹堡大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文研究LZ实验的高能核反冲是否可用放热暗物质解释，在最小非弹性暗光子模型中实现该框架，两种宇宙学机制可重现观测速率，对不同靶标有可靠预测。
AI中文摘要：
我们研究LZ（LUX-ZEPLIN）实验报道的高能核反冲是否可由放热暗物质解释。该LZ事件可发生在优选参数区域：暗物质质量m_χ~30-200GeV，质量分裂δ~0.5-1MeV，此区域可容纳单个事件而无低能额外活动。我们在最小非弹性暗光子模型中实现该框架，表明冻结（freeze-out）和低再加热温度的冻结入（freeze-in）宇宙学均可重现观测到的速率，具有GeV量级的媒介子质量和小的动力学混合。该场景对晕不确定性基本不敏感，对不同靶标有可靠预测，尤其氩和锗探测器预计会在当前氙能区以上观测到事件。
英文摘要：
We investigate whether the high-energy nuclear recoil reported by the LUX-ZEPLIN (LZ) experiment can be explained by exothermic dark matter. We realize this framework in a minimal inelastic dark photon model and show that both freeze-out and low-reheating-temperature freeze-in cosmologies can reproduce the observed rate, with GeV-scale mediator masses and small kinetic mixing. We find that the LZ event can occur in a preferred parameter region with dark matter mass around $m_χ\sim 30-200~\mathrm{GeV}$, and mass splitting $δ\sim 0.5-1~\mathrm{MeV}$. The scenario is largely insensitive to halo uncertainties and has robust predictions for different targets. In particular, argon and germanium detectors are expected to observe events at energies above the current xenon window.
