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arXiv 2512.05850hep-phhep-ex
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来自LZ、PandaX-4T和XENONnT数据的暗物质影响

Dark Matter implications from the LZ, PandaX-4T and XENONnT Data

Tsinghua University（清华大学）；Peking University（北京大学）；Columbia University（哥伦比亚大学）

Haipeng An, Fei Gao, Jia Liu, Minghao Liu, Haoming Nie, Changlong Xu

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8 pages, 5 figures
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AI总结：

研究液氙实验数据中高能核反冲事件的暗物质起源，用统一DIAMX框架对多数据集联合拟合，考虑两类暗物质 - 核子相互作用，量化DEC背景影响，指出扩展分析高能数据可有力检验暗物质解释。

摘要：

我们研究了来自液氙时间投影室实验（包括LZ、PandaX-4T和XENONnT）数据中类似高能核反冲事件可能的暗物质起源，这些事件无法用标准弹性自旋无关的弱相互作用大质量粒子（WIMP）散射来解释。利用基于公开数据和似然模型构建的统一DIAMX框架，我们首次对总曝光量约8.8吨·年的多个WIMP搜索数据集进行了联合轮廓似然拟合。考虑了两类暗物质 - 核子相互作用，涉及速度依赖截面或非弹性（吸热和放热）散射，可重现观测到的高能反冲谱，局部显著性高达3.5σ。进一步量化了124Xe双电子俘获（DEC）背景的影响，发现未知的DEC电荷产率变化可使推断的显著性从类似零结果变为3.5σ。还指出将相同分析扩展到所有三个实验中高达300 keV反冲能量的数据（若可用），将对暗物质解释提供有力检验，因为在此高能范围内124Xe DEC背景预计可忽略不计。

英文摘要：

We investigate a possible dark matter origin of the high-energy nuclear-recoil-like events in data from liquid xenon time projection chamber experiments, including LZ, PandaX-4T, and XENONnT, which cannot be explained by standard elastic spin-independent WIMP scattering. Using our unified DIAMX framework, built on openly available data and likelihood models, we perform the first combined profile-likelihood fits to multiple WIMP-search datasets with a total exposure of approximately 8.8 tonne $\times$ year. We consider two broad classes of dark matter-nucleon interactions, involving either velocity-dependent cross sections or inelastic (endo- and exothermic) scattering, which can reproduce the observed high-energy recoil spectrum, reaching local significances up to $3.5σ$. We further quantify the impact of $^{124}$Xe double electron capture (DEC) backgrounds, finding that variations in the poorly known DEC charge yields can shift the inferred significances from a null-like result to $3.5σ$. We further note that extending the same analysis to data from all three experiments with recoil energies up to $300~\mathrm{keV}$, when available, will provide a powerful test of the dark matter interpretation, since the $^{124}$Xe DEC background is expected to be negligible in this high-energy range.

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