发表机构
Istituto Nazionale di Fisica Nucleare, Sezione di Torino（意大利国家核物理研究所都灵分部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对LZ合作组248 keV核反冲候选事件，在希格斯耦合最小暗物质框架下计算太阳俘获与湮灭产生的高能中微子，发现多个质量基准点与IceCube观测存在强烈张力。
AI 中文摘要
LUX-ZEPLIN (LZ) 合作组报告了一个能量为 $248$ keV 的核反冲候选事件，这促使人们将其解释为吸热暗物质 (DM) 的信号。我们在希格斯耦合的最小暗物质 (HC-MDM) 框架下研究该信号，其中产生地面反冲的同一电弱相互作用也会导致暗物质在太阳中被俘获，并产生可能可观测的高能中微子信号。我们独立确定了重现 LZ 事件所需的质量劈裂，并对太阳俘获及俘获后演化进行了改进计算。我们的处理包括天然同位素混合物、精确的非弹性运动学、核形状因子、运动学闭合附近的有限温度核运动、通过圈诱导弹性散射的轨道冷却，以及显式的俘获-湮灭平衡检验。所得的太阳预言在数值上稳定，并对所考虑的天体物理和核变化具有鲁棒性。在已发布的 IceCube 暗物质质量网格中的两个热基准点 $3_M2_D$ 和 $5_M4_D$ 上，预言的湮灭率分别超过质量匹配的 $W^+W^-$ IceCube 响应约 $2.2\ imes10^3$ 倍和 $91$ 倍，使得在此使用的 $W^+W^-$ 响应映射下，两个标准晕模型都面临强烈张力。对于质量高于已发布的 $10$ TeV IceCube 网格的更重表示，我们构建了基于响应的高质量外推。$22$ TeV 的 $7_M6_D$ 基准点即使在保守的响应损失外推下仍与 IceCube 存在强烈张力，而 $48$ TeV 的 $9_M8_D$ 基准点也仍高于外推响应，尽管更接近灵敏度边界。$82$ TeV 的 $11_M10_D$ 基准点依赖于响应，而 $130$ TeV 的 $13_M12_D$ 基准点仍低于外推的 IceCube 灵敏度。
英文摘要
The LUX-ZEPLIN (LZ) Collaboration has reported a nuclear-recoil candidate at $248$ keV, motivating interpretations in terms of endothermic dark matter (DM). We investigate this signal in Higgs-coupled minimal dark matter (HC-MDM), where the same electroweak interaction responsible for the terrestrial recoil also induces DM capture in the Sun and a potentially observable high-energy neutrino signal. We independently determine the mass splittings required to reproduce the LZ event and perform an improved calculation of Solar capture and post-capture evolution. Our treatment includes natural isotope mixtures, exact inelastic kinematics, nuclear form factors, finite-temperature nuclear motion near kinematic closure, orbital cooling through loop-induced elastic scattering, and an explicit capture--annihilation equilibrium test. The resulting Solar predictions are numerically stable and robust against the astrophysical and nuclear variations considered. For the two thermal benchmarks within the released IceCube DM mass grid, $3_M2_D$ and $5_M4_D$, the predicted annihilation rates exceed the mass-matched $W^+W^-$ IceCube response by factors of approximately $2.2\times10^3$ and $91$, placing both standard-halo solutions under strong tension within the $W^+W^-$ response mapping used here. For the heavier representations, whose masses lie above the published $10$ TeV IceCube grid, we construct a response-based extrapolation to higher masses. The $22$ TeV $7_M6_D$ benchmark remains in strong tension with IceCube even under our conservative response-loss extrapolation, while the $48$ TeV $9_M8_D$ benchmark also remains above the extrapolated response, although much closer to the sensitivity boundary. The $82$ TeV $11_M10_D$ benchmark is response dependent, whereas the $130$ TeV $13_M12_D$ benchmark remains below the extrapolated IceCube sensitivity.
Comments29 pages, 11 figures and 6 tables. Comments are welcome!
