GNMSSM中TeV尺度规范微子下LZ高反冲事件的Higgsino暗物质解释
Higgsino Dark Matter Interpretation of the LZ High-Recoil Event in the GNMSSM with TeV-Scale Gauginos
AI总结：
本文在GNMSSM中利用Higgsino-Singlino混合实现亚MeV劈裂，以TeV规范微子解释LZ实验约248 keV高反冲事件，提出六个满足所有约束的基准点。
AI中文摘要：
LUX-ZEPLIN合作组报告的约248 keV核反冲事件激发了对吸热暗物质散射的研究。我们在广义次最小超对称标准模型（GNMSSM）中研究这一现象，其中Higgsino主导的中性ino暗物质经历$Z$介导的跃迁$\tilde{\chi}_1^0N\to\tilde{\chi}_2^0N$。在MSSM的传统热Higgsino极限中，观测到的遗迹丰度选择约1.1 TeV的质量，而几百keV的中性ino劈裂通常需要约$10^7$ GeV的规范微子质量。在GNMSSM中，Higgsino-Singlino混合引入了对劈裂的额外贡献，可以抵消规范微子诱导的贡献，从而允许在multi-TeV规范微子下实现sub-MeV劈裂。这种混合还修改了非弹性散射耦合和湮灭率，而伴随slepton的共湮灭为获得观测到的遗迹丰度提供了自由度。我们提出了六个基准点，暗物质质量为0.66-1.11 TeV，中性ino劈裂为333-350 keV，规范微子质量为2-5 TeV。这些点重现了观测到的遗迹丰度，并满足直接探测、Higgs、味物理和对撞机约束。在标准晕模型和扩展似然分析下，所有六个点相对于最佳拟合产生$\Delta\chi^2<1$。我们的结果表明GNMSSM如何在不引入超重规范微子扇区的情况下容纳LZ高反冲事件。对太阳捕获和中微子望远镜约束的定量评估对于确定可行性仍然是必要的。
英文摘要：
The nuclear recoil event at approximately 248 keV reported by the LUX-ZEPLIN collaboration motivates an investigation of endothermic dark matter scattering. We study this within the General Next-to-Minimal Supersymmetric Standard Model (GNMSSM), with Higgsino-dominated neutralino DM undergoing the $Z$-mediated transition $\widetildeχ_1^0N\to\widetildeχ_2^0N$. In the conventional thermal Higgsino limit of the MSSM, the observed relic abundance selects a mass near 1.1 TeV, while a neutralino splitting of a few hundred keV typically requires gaugino masses of order $10^7$ GeV. In the GNMSSM, Higgsino-Singlino mixing introduces an additional contribution to the splitting that can cancel the gaugino-induced contribution, allowing sub-MeV splitting with multi-TeV gauginos. This mixing also modifies the inelastic scattering coupling and annihilation rates, while coannihilation with sleptons provides freedom in obtaining the observed relic abundance. We present six benchmark points with DM masses of 0.6-1.1 TeV, neutralino splittings of 333-350 keV, and gaugino masses of 2-5 TeV. These points reproduce the observed relic abundance and satisfy direct-detection, Higgs, flavor, and collider constraints. Within the Standard Halo Model and extended-likelihood analysis, all six points yield $Δχ^2<1$ relative to the best fit. Our results show how the GNMSSM can accommodate the LZ high-recoil event without an ultraheavy gaugino sector. A quantitative assessment of solar-capture and neutrino-telescope constraints remains necessary for establishing viability.
