发表机构
University of California, Berkeley; Lawrence Berkeley National Laboratory; RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN; Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS, The University of Tokyo（加州大学伯克利分校; 劳伦斯伯克利国家实验室; 理化学研究所跨学科理论数学科学中心（iTHEMS）; 东京大学宇宙线起源研究国际研究中心（WPI））
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出暗物质是标准模型希格斯玻色子的Z₂奇伙伴模型，可解释银河晕伽马射线过剩及LUX-ZEPLIN实验248 keV核反冲事件，预测大年度调制且具备强可验证性。
AI 中文摘要
银河晕可能存在的伽马射线过剩倾向于质量为数百GeV的暗物质。在之前的研究中，我们发现电弱标量二重态是简单可重整化热暗物质模型中特别经济且几乎唯一被选中的解释。我们指出，其未破缺的Z₂对称性等价于两个希格斯二重态之间的交换对称性，这使得暗物质成为标准模型希格斯玻色子的Z₂奇伙伴，暗示这两个二重态可能共享一个共同的弱标度起源。我们将该模型与最近LUX-ZEPLIN实验报道的248 keV核反冲事件联系起来。对于质量为440–600 GeV的暗物质，一个技术上自然的、量级为350 keV的质量相关中性态分裂，在运动学边界附近形成了一条窄带，其中固定的非对角Z相互作用可产生观测到的反冲。由于散射探测的是银河分布的极高速度尾，该解释预测会出现大的年度调制，未来事件将优先出现在初夏前后。目前两种观测均未定论，但它们的共同解释具有极强的可验证性。
英文摘要
A possible gamma-ray excess from the Galactic halo favors dark matter with a mass of several hundred GeV. In previous work, we found that an electroweak scalar doublet is a particularly economical, and nearly uniquely selected, interpretation among simple renormalizable thermal dark-matter models. We point out that its unbroken Z_2 symmetry is exactly equivalent to an interchange symmetry between two Higgs doublets, making dark matter the Z_2-odd partner of the Standard Model Higgs boson and suggesting that the two doublets may share a common weak-scale origin. We connect this model to the recently reported 248 keV nuclear-recoil event in the LUX-ZEPLIN experiment. For dark-matter masses of 440--600 GeV, a technically natural, mass-dependent neutral-state splitting of order 350 keV defines a narrow strip near the kinematic boundary where the fixed off-diagonal Z interaction can produce the observed recoil. Because the scattering probes the extreme high-velocity tail of the Galactic distribution, this interpretation predicts a large annual modulation, with future events preferentially occurring around early summer. Neither observation is yet conclusive, but their common interpretation is sharply testable.
Comments6 pages; v2: added a note discussing the concurrent solar-capture constraint
