发表机构
University of California Santa Cruz; California Institute of Technology; Fermilab; University of Pittsburgh; University of Oregon（加州大学圣克鲁兹分校; 加州理工学院; 费米国家加速器实验室; 匹兹堡大学; 俄勒冈大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出暗重子暗物质模型，通过跃迁磁偶极算子产生非弹性散射，解释LZ实验单事件，预测伴随光子信号，支持方向性探测。
AI 中文摘要
我们发展了一种暗重子暗物质候选者理论，该候选者主要通过由跃迁磁偶极算子介导的非弹性散射与原子核相互作用。我们提出了若干模型，这些模型能够优雅地解释散射率和非弹性劈裂的大小，使其与LZ实验观测到的一个事件相符。由于强耦合区内的偶然对称性，弹性散射被抑制。核响应主要由自旋相关结构因子主导，因此我们发现，对于多种可能的暗物质速度分布，质量范围$1 \\; {\rm TeV} \lesssim m_\chi \lesssim 50 \\; {\rm TeV}$和质量劈裂$100 \\; {\rm keV} \lesssim \delta \lesssim 500 \\; {\rm keV}$可以拟合数据。这些模型预测，一些核散射事件将伴随能量为$\delta$的同时光子信号，这不仅将该模型与其他非弹性暗物质解释区分开来，还使得在常规直接探测实验中能够进行方向性探测。我们简要评论了暗物质丰度、间接探测信号（包括模型中来自太阳内暗物质湮灭的显著较弱约束）以及由理论介子扇区产生的相关对撞机信号。
英文摘要
We develop a theory of a dark baryon dark matter candidate that interacts with nuclei dominantly through inelastic scattering mediated by a transition magnetic dipole operator. Models are presented that can elegantly explain both the scattering rate and the size of the inelastic splitting to be consistent with the one event observed at LZ\@. Elastic scattering is suppressed due to accidental symmetries within the strongly-coupled sector. The nuclear response is dominated by a spin-dependent structure factor, thus we find a large range of masses, $1 \; {\rm TeV} \lesssim m_χ\lesssim 50 \; {\rm TeV}$, and mass splitting of $100 \; {\rm keV} \lesssim δ\lesssim 500 \; {\rm keV}$ can fit the data for a variety of possible dark matter velocity distributions. The models predict that some nuclear scattering events will be accompanied by a simultaneous photon signal with energy $δ$, which not only distinguishes this model from other inelastic dark matter explanations but also enables directional detection in conventional direct detection experiments. We briefly comment on the dark matter abundance, indirect detection signals (including the models' significantly weaker constraints from dark matter annihilation in the Sun), and the associated collider signals that arise from the meson sector of the theory.
Comments21 pages + Refs., 1 Table, 5 Figure
