希格斯ino暗物质对LUX-ZEPLIN 248 keV核反冲事件的解释
Higgsino Dark Matter Interpretation of the LUX-ZEPLIN 248 keV Nuclear-Recoil Event
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- The University of Texas at Austin（德克萨斯大学奥斯汀分校）
- Stockholm University（斯德哥尔摩大学）
- KTH Royal Institute of Technology（皇家理工学院）
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中文总结 AI 辅助
该研究提出用近纯希格斯ino暗物质模型解释LZ实验报道的248 keV核反冲事件，其非弹性散射截面在质量分裂约350 keV时接近LZ的90%置信区间。
中文摘要 AI 辅助
我们提出希格斯ino暗物质作为LUX-ZEPLIN（LZ）实验报道的受关注248 keV核反冲事件的潜在解释。LZ详细研究了几种稀有本底过程和探测器效应，但未确定任何一种能合理解释该事件。质量m_~H~≈1 TeV的近纯希格斯ino，通过两个近简并中性马约拉纳态的非对角Z耦合（其质量分裂为δ），自然实现非弹性暗物质。同一电弱相互作用确定了非弹性希格斯ino-核子散射截面，而非将其作为自由参数。我们表明，当δ≈350 keV时，预测的希格斯ino非弹性散射截面接近已发表的LZ双侧90%置信区间。
英文摘要
We propose Higgsino dark matter as a potential interpretation of the $248~\mathrm{keV}$ nuclear-recoil event of interest reported by the LUX-ZEPLIN (LZ) experiment. LZ studied several rare background processes and detector effects in detail, but did not identify any as a likely explanation of the event. A nearly pure Higgsino naturally realizes inelastic dark matter through the off-diagonal $Z$ coupling of two nearly degenerate neutral Majorana states separated by a mass splitting $δ$. The same electroweak interaction fixes the inelastic Higgsino-nucleon scattering cross section, rather than leaving it as a free parameter. We show that the predicted Higgsino inelastic scattering cross section approaches the published LZ two-sided 90% confidence interval for a Higgsino mass $m_{\widetilde H}\sim1~\mathrm{TeV}$ and a mass splitting $δ\sim350~\mathrm{keV}$.
