非弹性暗物质与重子味对称性：基于LUX-ZEPLIN (LZ)实验的视角
Inelastic dark matter and baryon flavor symmetry in light of LUX-ZEPLIN (LZ) experiment
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中文总结 AI 辅助
提出一种具有$U(1)'$重子味对称性的非弹性暗物质模型，可同时解释LZ实验核反冲事件和正确的遗迹密度，并预言轻$Z'$玻色子。
中文摘要 AI 辅助
我们在标准模型（SM）的一个简单扩展中提出了一种新的非弹性暗物质模型，该扩展具有局域$U(1)'$重子味对称性，例如$U(1)_{B_i-B_j}$（其中$i\ eq j$）。在此框架下，我们通过高维算符或SM夸克与额外矢量-like夸克（这些夸克自身是无反常的）之间的可重整化耦合，实现了混合Yukawa耦合的现实味结构。我们将一个Dirac单态费米子视为暗物质，并且仅在$U(1)'$对称性自发破缺后，才获得用于非弹性暗物质的小质量劈裂。特别是，在质量为$1\,{\ m TeV}$的重暗物质情景中，我们表明存在一个一致的参数空间，可以同时解释LZ核反冲事件和正确的暗物质遗迹密度，并且同时满足现有的对撞机和间接探测约束。在这种情况下，我们预言了一个质量在$10-20\,{\ m GeV}$之间的相对较轻的$Z'$玻色子以及弱的规范耦合，这提示了在对撞机上进行专门搜索的必要性。
英文摘要
We present a novel model for inelastic dark matter in a simple extension of the Standard Model (SM) with a local $U(1)'$ baryon flavor symmetry, such as $U(1)_{B_i-B_j}$ with $i\neq j$. In this framework, we realize a realistic flavor structure for the mixing Yukawa couplings due to higher dimensional operators or renormalizable couplings between the SM quarks and extra vector-like quarks that are anomaly-free by themselves. We regard a Dirac singlet fermion as being dark matter and obtaining a small mass splitting for inelastic dark matter, only after the $U(1)'$ symmetry is broken spontaneously. We show that there is a consistent parameter space for explaining both the LZ nuclear recoil event and the correct relic density for dark matter and the existing collider and indirect detection bounds are satisfied at the same time. In this case, we predict a relatively light $Z'$ boson with $10-20\,{\rm GeV}$ mass and a weak gauge coupling, suggesting a dedicated search at colliders. The future data with higher recoil energies at direct detection experiments will play a decisive role of discriminating between the scenarios of light and heavy dark matter.
发表机构
- Chung-Ang University（中央大学）
- CERN（欧洲核子研究中心）
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