解释LUX-ZEPLIN高反冲事件：Bino-/Singlino-like与Higgsino暗物质
Interpreting the High-Recoil LUX-ZEPLIN Event with Bino-/Singlino-like and Higgsino Dark Matter
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中文总结 AI 辅助
针对LZ实验248 keV核反冲候选事件，研究弹性与非弹性两类超对称中性ino暗物质解释，通过调节Higgsino不对称性实现自旋无关散射抑制，并预测不同反冲谱以区分机制。
中文摘要 AI 辅助
LUX-ZEPLIN（LZ）实验最近报告了一个核反冲候选事件，其能量为$E_R\simeq248$ keV。我们研究了两种基于中性ino与$Z$玻色子不同耦合的超对称解释。在弹性情形下，bino-或singlino-like中性ino通过由Higgsino不对称性$X=|N_{13}|^2-|N_{14}|^2$而非总Higgsino比例决定的对角轴矢量$Z$耦合进行散射。由于自旋依赖盲点与自旋无关盲点不一致，在保持$X\sim10^{-2}$的同时，Higgs介导的散射可以被抑制。在MSSM中，这倾向于低$\tan\beta$，这与在几TeV squark谱下观测到的Higgs质量相矛盾，而NMSSM的树级四次项缓解了这一矛盾。一个显式的NMSSM基准点，其中$m_\chi\simeq500$ GeV且$X\simeq0.007$（低于当前LZ限制），通过略高于阈值的singlet-like赝标量共振获得其遗迹丰度，这也抑制了当前的湮灭。在非弹性情形下，pseudo-Dirac Higgsino发生吸热散射，其分裂为几百keV，由PeV尺度的gaugino产生，可通过反号bino-wino抵消或弱singlino混合来降低；最小热实现受到太阳中微子搜索的强烈约束。这两种机制预测了远离候选事件的不同反冲谱。
英文摘要
The LUX-ZEPLIN (LZ) experiment has recently reported a nuclear-recoil candidate at $E_R\simeq248$ keV. We study two supersymmetric interpretations based on distinct neutralino couplings to the $Z$ boson. In the elastic case, a bino- or singlino-like neutralino scatters through a diagonal axial $Z$ coupling set by the Higgsino asymmetry $X=|N_{13}|^2-|N_{14}|^2$ rather than by the total Higgsino fraction. Since the spin-dependent blind spot does not coincide with the spin-independent one, Higgs-mediated scattering can be suppressed while retaining $X\sim10^{-2}$. In the MSSM this favors low $\tanβ$, in tension with the observed Higgs mass for a few-TeV squark spectrum, a tension relieved by the tree-level quartic of the NMSSM. An explicit NMSSM benchmark with $m_χ\simeq500$ GeV and $X\simeq0.007$, below current LZ limits, obtains its relic abundance from a singlet-like pseudoscalar resonance just above threshold, which also suppresses present-day annihilation. In the inelastic case, a pseudo-Dirac Higgsino scatters endothermically, with a splitting of a few hundred keV generated by gauginos at the PeV scale which can be lowered by opposite-sign bino-wino cancellation, or by weak singlino mixing; the minimal thermal realization is strongly constrained by solar-neutrino searches. The two mechanisms predict distinct recoil spectra away from the candidate.
发表机构
- Argonne National Laboratory（阿贡国家实验室）
- University of Cincinnati（辛辛那提大学）
- Johannes Gutenberg University（约翰内斯·古腾堡大学）
- University of Chicago（芝加哥大学）
- Perimeter Institute for Theoretical Physics（理论物理珀米特研究所）
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