发表机构
Kavli IPMU (WPI), UTIAS, University of Tokyo; Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma（卡弗里宇宙物理前沿研究所（WPI），多伦多大学应用科学与技术学院，东京大学; 奥克拉荷马大学霍默·L·道奇物理与天文学系）
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LUX-ZEPLIN的248 keV核反冲事件源于复合暗物质的吸热超精细激发，在PQ增强暗QCD框架下，亚TeV暗物质可产生量级为一的事件率，提供暗物质超精细光谱学新途径。
AI 中文摘要
我们提出，LUX-ZEPLIN实验报告的248 keV核反冲候选事件可能源于复合暗物质的吸热超精细激发。散射的非弹性并非需要两种不同的暗区粒子，而是源于单个暗强子中赝标量与矢量态之间的超精细跃迁。在PQ增强的暗QCD框架下，宇称守恒真空抑制了危险的弹性散射，而轴子发射则耗尽了残余激发态粒子数。银河系运动学边缘附近的吸热激发自然产生一个局域化的高能反冲峰。我们发现，具有几百keV超精细分裂的亚TeV尺度暗物质可以在LZ高反冲窗口中产生量级为一的事件率。这一解释提供了一种可能的暗物质超精细光谱学形式，并可通过暗光子搜索和未来的反冲谱测量进行互补检验。
英文摘要
We propose that the $248\,\mathrm{keV}$ nuclear-recoil candidate reported by LUX--ZEPLIN can arise from the endothermic hyperfine excitation of composite dark matter. Rather than requiring two distinct dark-sector particles, the inelasticity of scattering arises from a hyperfine transition between the pseudoscalar and vector states of a single dark hadron. In a PQ-augmented dark QCD framework, the parity-conserving vacuum suppresses dangerous elastic scattering, while axion emission depletes the relic excited-state population. Endothermic excitation near the Galactic kinematic edge then naturally produces a localized high-energy recoil peak. We find that sub-TeV-scale dark matter with a hyperfine splitting of a few hundred keV can yield an order-one event rate in the LZ high-recoil window. This interpretation offers a possible form of dark-matter hyperfine spectroscopy, with complementary tests from dark-photon searches and future recoil-spectrum measurements.
Comments12 pages, 3 figues
