发表机构
Institute for Academic Innovation, Hokkaido University; Department of Physics, Hokkaido University; College of Physics, Sichuan University（北海道大学学术创新研究所; 北海道大学物理系; 四川大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在隐藏$U(1)_H$扩展标准模型中引入非弹性标量暗物质候选者，通过湮灭满足丰度并解释LZ实验高核反冲事件，给出暗光子质量相关的动力学混合界限，供未来实验检验。
AI 中文摘要
我们研究标准模型（SM）的一个隐藏$U(1)_H$扩展，引入两个SM单态复标量场，其中一个由于具有另一个场电荷一半的$U(1)_H$电荷，可被视为可行的非弹性暗物质（DM）候选者，而另一个场则获得真空期望值。首先，我们估计通过DM湮灭满足观测到的DM relic丰度的参数区域，并进一步利用这些参数研究非弹性DM-核散射，以重现LZ合作组最近发现的高核反冲能事件。这些相互作用由暗光子（$A^\prime$）介导，暗光子在$U(1)_H$对称性自发破缺后产生，并与SM光子发生动力学混合。因此，我们估计动力学混合作为$A^\prime$质量的函数的界限，并最终将其与来自不同束流倾倒和对撞机实验的现有实验界限进行比较。这些参数未来可通过寿命和能量前沿实验进行探测。
英文摘要
We study a hidden $U(1)_H$ extension of the Standard Model (SM) introducing two SM singlet complex scalar fields where one of them can be considered as a viable inelastic Dark Matter (DM) candidate due to its $U(1)_H$ charge being half of the charge of the other one which develops a vacuum expectation value. First we estimate a parameter region satisfying observed DM relic abundance through DM annihilation and further use these parameters to study inelastic DM-nucleus scattering to reproduce the recent high nuclear recoil energy event found by LZ collaboration. These interactions are mediated by a dark photon $(A^\prime)$ which is evolved after the spontaneous breaking of $U(1)_H$ symmetry and having a kinetic mixing with the SM photon. Hence we estimate bounds on the kinetic mixing as a function of $A^\prime$ mass and finally compare it with existing experimental bounds from different beam-dump and collider experiments. These parameters could be probed by lifetime and energy frontier experiments in future.
Comments9 pages, 4 figures, discussion extended and references added
