发表机构
Theoretical Physics Department, CERN; Department of Physics and Astronomy, University of Delaware and the Bartol Research Institute（理论物理部，欧洲核子研究中心; 特拉华大学物理与天文系及巴特尔研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用IceCube实验未观测到太阳高能中微子的结果，对质量约1.08 TeV的希格斯ino暗物质的质量分裂给出δ>566 keV的强约束，排除了LZ实验事例的相关解释。
AI 中文摘要
希格斯ino暗物质仍是最具说服力的暗物质候选者之一，当两个马约拉纳分量之间的分裂量级为O(几个MeV)或更小时，它可处于“准狄拉克” regime。由于太阳的强引力作用，暗物质粒子在太阳核心加速至约1400 km/秒，这使其能与重元素发生非弹性散射并被有效捕获至太阳束缚轨道。我们针对宇宙学偏好的质量m_χ ≃ 1.08 TeV，将质量分裂δ作为自由参数，评估了χχ→W⁺W⁻、ZZ湮灭产生的中微子预期通量。将其与IceCube实验未观测到来自太阳的高能中微子的结果对比，得到了可靠的约束：δ>566 keV。这些约束排除了将近期LZ实验的事例解释为希格斯ino暗物质与氙核的吸热非弹性散射的可能。
英文摘要
Higgsino dark matter remains one of the most convincing dark matter candidates. It can exist in a ``quasi-Dirac" regime, when the splitting between two Majorana components is on the order of $O(\rm few~\,MeV)$ or less. Owing to the strong gravitational pull of the Sun, the DM particles accelerate to up to $\sim 1400$\,km/sec in the solar core, which allows for inelastic scattering on heavy elements and very effective capture onto solar-bound trajectories. We evaluate the expected flux of the neutrinos from the expected $χχ\to W^+W^-,ZZ$ annihilation for the cosmologically preferred mass, $m_χ\simeq 1.08$\,TeV while keeping the mass splitting $δ$ as a free parameter. Confronting it with the non-observation of high-energy neutrinos from the Sun by the IceCube experiment, we obtain a robust limit, $δ>566$\,keV. These limits exclude the interpretation of the recent LZ event in terms of endothermic inelastic scattering of Higgsino dark matter on xenon nuclei.
Comments6 pages, 4 figures
