发表机构
PRISMA ++ Cluster of Excellence \& Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099 Mainz, Germany
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出用单态-双重态马约拉纳暗物质的弹性自旋相关散射解释LZ实验高能核反冲候选事件，通过希格斯盲点抑制自旋无关背景，并预测可被太阳中微子搜索检验的事件率。
AI 中文摘要
LUX-ZEPLIN (LZ) 实验最近在 2.84 吨·年的曝光量中报告了一个核反冲候选事件，其反冲能量为 $E_R=248\pm23_{\rm stat}\pm23_{\rm sys}\\,{\rm keV}$。在这个异常高的反冲能量下，自旋无关 (SI) 氙响应被强烈抑制，这促使人们考虑具有更硬反冲谱的暗物质相互作用。我们证明，通过非相对论算符 $\mathcal O_4=\mathbf S_{\rm DM}\cdot\mathbf S_N$ 的弹性自旋相关 (SD) 散射可以简单实现这种谱。我们考虑单态-双重态马约拉纳暗物质，其对角 $Z$ 耦合产生所需的 SD 相互作用。伴随的希格斯介导 SI 相互作用通常会产生过多低能反冲，但可以在希格斯盲点处被抑制，同时保留非零 $Z$ 耦合。我们发现希格斯盲点的一个区域同时预测了 LZ 高反冲窗口中的 $\mathcal O(1)$ 事件率，并再现了观测到的热 relic 丰度。相同的 SD 相互作用导致太阳俘获，使得该区域可以通过太阳中微子搜索进行独立检验。当前的 IceCube 限制已经探测了部分与 LZ 兼容的热参数空间，而一个可行区域仍然存在。因此，额外的氙曝光和改进的太阳中微子搜索可以为这一解释提供互补的检验。
英文摘要
The LUX-ZEPLIN (LZ) experiment has recently reported a nuclear-recoil candidate at $E_R=248\pm23_{\rm stat}\pm23_{\rm sys}\,{\rm keV}$ in an exposure of $2.84\,{\rm tonne\,yr}$. At this unusually high recoil energy, the spin-independent (SI) xenon response is strongly suppressed, motivating dark matter interactions with a harder recoil spectrum. We show that elastic spin-dependent (SD) scattering through the nonrelativistic operator $\mathcal O_4=\mathbf S_{\rm DM}\cdot\mathbf S_N$ provides a simple realization of such a spectrum. We consider singlet-doublet Majorana dark matter, for which a diagonal $Z$ coupling generates the required SD interaction. The accompanying Higgs-mediated SI interaction would generically produce too many low-energy recoils, but can be suppressed along a Higgs blind spot while retaining a nonzero $Z$ coupling. We find a region of the Higgs blind spot that simultaneously predicts an $\mathcal O(1)$ event rate in the LZ high-recoil window and reproduces the observed thermal relic abundance. The same SD interaction leads to solar capture, allowing this region to be tested independently with solar-neutrino searches. Current IceCube limits already probe part of the LZ-compatible thermal parameter space, while a viable region remains. Additional xenon exposure and improved solar-neutrino searches can therefore provide complementary tests of this interpretation.
Comments7 pages, 3 figures, lots of fun. Comments welcome! v2: Minor improvements, conclusions unchanged
