发表机构
Center for Fundamental Physics, School of Artificial Intelligence, Hubei Polytechnic University; Physics Department, Theory Division, University of Ioannina（湖北理工学院人工智能学院基础物理中心; 伊奥尼纳大学物理系理论部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出暗维度框架下的赝狄拉克暗物质模型，以几何起源解释LZ实验高反冲事件，并给出多靶标检验预测。
AI 中文摘要
LUX-ZEPLIN（LZ）实验的扩展核反冲分析报告了一个与约248 keV反冲能量相容的事件，这激发了在大反冲能量下具有支持的内吸型暗物质场景。我们研究了一个嵌入五维暗维度框架中的赝狄拉克电弱双重态暗物质模型。标准模型和矢量型电弱双重态定域在可见膜上，而暗数破坏通过一个中性体态进行传递。由此产生的质量劈裂呈指数抑制，δ=δ_UV e^{-2πMR}，为与非弹性散射相关的几百keV能标提供了几何起源。中性弱流主要处于非对角形式，将中子标度归一化固定在σ_{χn}^Z≈1.86×10^{-39} cm²。利用扩展LZ反冲窗口的双箱泊松诊断，我们在(m_χ,δ)≈(1.35 TeV,366 keV)附近发现一个浅极小值，而热学动机点(1.1 TeV,360 keV)仅高出Δχ²≈0.21。同一基准在运动学上对轻靶标不可及，但对氙和钨仍然开放，为模型提供了特征性的多靶标检验。对于CaWO₄，我们在95–150 keV区间内获得积分钨速率为3.15×10⁻²事件 kg⁻¹ yr⁻¹。这些结果将赝狄拉克劈裂的几何起源与高反冲直接探测现象学联系起来。
英文摘要
The extended nuclear-recoil analysis of LUX-ZEPLIN (LZ) has reported one event compatible with a recoil energy near $248$ keV, motivating endothermic dark-matter scenarios with support at large recoil energy. We study a pseudo-Dirac electroweak-doublet dark-matter model embedded in a five-dimensional Dark-Dimension framework. The Standard Model and the vectorlike electroweak doublets are localized on the visible brane, while dark-number violation is communicated through a neutral bulk state. The resulting mass splitting is exponentially suppressed, $δ=δ_{\rm UV}e^{-2πMR}$, providing a geometric origin for the few-hundred-keV scale relevant to inelastic scattering. The neutral weak current is dominantly off diagonal, fixing the neutron-scale normalization at $σ_{χn}^{Z}\simeq1.86\times10^{-39}\,\mathrm{cm^2}$. Using a two-bin Poisson diagnostic of the extended LZ recoil window, we find a shallow minimum near $(m_χ,δ)\simeq(1.35~\TeV,366~\keV)$, while the thermally motivated point $(1.1~\TeV,360~\keV)$ lies only $Δχ^2\simeq0.21$ higher. The same benchmark is kinematically inaccessible to light targets but remains open for xenon and tungsten, providing a characteristic multi-target test of the model. For CaWO$_4$ we obtain an integrated tungsten rate of $3.15\times10^{-2}$ events kg$^{-1}$ yr$^{-1}$ in the $95$--$150$ keV interval. These results connect the geometric origin of the pseudo-Dirac splitting with high-recoil direct-detection phenomenology.
Comments10 pages, 10 Figures
