Kaluza--Klein暗光子中介的非弹性暗物质在LUX-ZEPLIN实验中的研究
Kaluza--Klein Dark-Photon Mediation of Inelastic Dark Matter at LUX-ZEPLIN
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中文总结 AI 辅助
针对LUX-ZEPLIN高反冲事件，提出五维单态费米子经KK暗光子塔中介的非弹性暗物质模型，局域化过滤传播子使高反冲氙速率增强约四倍，并预测局域化、谱畸变与非弹性运动学的关联。
中文摘要 AI 辅助
我们研究了一个五维实现的吸热暗物质模型，该模型受到近期LUX-ZEPLIN高反冲事件的启发。一个赝狄拉克标准模型单态费米子被局域在额外维度中，并与体$U(1)_D$规范场耦合。这种局域化既抑制了远距离膜上的马约拉纳算符并产生非弹性劈裂，也控制着与Kaluza--Klein（KK）暗光子塔的耦合，从而产生一个局域化过滤的传播子。我们围绕两个代表性的质量-劈裂点来组织唯象学：一个LZ基准点，$m_\chi=1.10~\TeV$和$\delta=365~\keV$，以及一个受IceCube启发的比较点，$m_\chi=1.08~\TeV$和$\delta=566~\keV$。后者仅用于比较地球和太阳的运动学；已发表的IceCube界限是针对Higgsino的，并不直接适用于我们的单态KK模型。在LZ基准点，取$R^{-1}=0.30~\GeV$和$m_0=0.10~\GeV$，KK塔相对于固定微观耦合下的单个暗光子，将高反冲氙速率增强了约四倍。LZ点刚好位于地球晕速度上限之下，而$566~\keV$比较点对于普通氙散射不可达，而是处于太阳俘获可及的运动学区域；任何针对当前单态模型的中微子约束仍取决于其俘获和湮灭动力学。因此，额外维度构造的特征性预测是局域化、KK谱畸变和非弹性运动学之间的关联性相互作用。
英文摘要
We study a five-dimensional realization of endothermic dark matter motivated by the recent high-recoil LUX-ZEPLIN event. A pseudo-Dirac Standard-Model singlet fermion is localized in the extra dimension and couples to a bulk $U(1)_D$ gauge field. The same localization that suppresses a distant-brane Majorana operator and generates the inelastic splitting also controls the couplings to the Kaluza--Klein (KK) dark-photon tower, producing a localization-filtered mediator propagator. We organize the phenomenology around two representative mass--splitting points: an LZ benchmark, $m_χ=1.10~\TeV$ and $δ=365~\keV$, and an IceCube-motivated comparison point, $m_χ=1.08~\TeV$ and $δ=566~\keV$. The latter is used only to compare terrestrial and solar kinematics; the published IceCube bound is Higgsino-specific and is not directly imposed on our singlet KK model. At the LZ benchmark with $R^{-1}=0.30~\GeV$ and $m_0=0.10~\GeV$, the KK tower enhances the high-recoil xenon rate by a factor of about four relative to a single dark photon at fixed microscopic coupling. The LZ point lies just below the terrestrial halo speed ceiling, whereas the $566~\keV$ comparison point is inaccessible to ordinary xenon scattering and instead lies in a kinematic regime accessible to solar capture; any neutrino constraint on the present singlet model remains dependent on its capture and annihilation dynamics. The characteristic prediction of the extra-dimensional construction is therefore a correlated interplay of localization, KK spectral distortion, and inelastic kinematics.
发表机构
- Center for Fundamental Physics, School of Artificial Intelligence, Hubei Polytechnic University（湖北理工学院人工智能学院基础物理中心）
- Physics Department, Theory Division, University of Ioannina（伊奥尼纳大学理论部物理系）
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