发表机构
School of Physics, Jiulonghu Campus, Southeast University（东南大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出自然暗光子介导的非弹性暗物质模型，通过圈图动力学混合和暗标量质量劈裂，解释LUX-ZEPLIN实验事件并缓解IceCube中微子约束。
AI 中文摘要
在圈图水平上，暗光子对应的暗$U(1)_X^{}$规范场在$Z_2^{}$离散对称性自发破缺以产生两个携带相同$U(1)_Y^{}$电荷但具有相反等幅$U(1)_X^{}$电荷的矢量费米子之间的小质量差后，可以自然地获得与标准模型超荷对应的$U(1)_Y^{}$规范场的微小动力学混合。为避免带电粒子产生不可接受的剩余丰度，这些矢量费米子可以通过一个TeV尺度的复暗标量衰变为标准模型带电轻子。在暗希格斯标量发展出其真空期望值以产生GeV量级的暗光子质量后，该暗标量的实部和虚部可以优雅地获得低于MeV尺度的质量劈裂。因此，暗光子可以介导暗物质与原子核之间的放热非弹性散射，从而自然地解释LUX-ZEPLIN实验中最近报道的事件，并大幅放宽来自IceCube中微子搜索的严格约束。
英文摘要
At loop level, a dark $U(1)_X^{}$ gauge field for dark photon can naturally acquire a tiny kinetic mixing with the standard model $U(1)_Y^{}$ gauge field for hypercharge after a $Z_2^{}$ discrete symmetry is spontaneously broken for generating a small mass difference between two vector-like fermions carrying the same $U(1)_Y^{}$ charge and the opposite $U(1)_X^{}$ charges of equal magnitude. To avoid an unacceptable relic density with electric charge, these vector-like fermions can decay into the standard model charged leptons with a TeV-scale complex dark scalar. The real and imaginary parts of this dark scalar can elegantly obtain a mass split below the MeV scale after a dark Higgs scalar develops its vacuum expectation value for generating a dark photon mass of the GeV order. Therefore, the dark photon can mediate an exothermic inelastic scattering of dark matter off nucleus to naturally explain the recently reported event in the LUX-ZEPLIN experiment and substantially relax the stringent constraints from the IceCube neutrino searches.
Comments16 pages, 2 figures
