论文标题
违反辐射衰减的充电Lepton风味$ l_i \ tol_jγ$ in G2HDM
Charged Lepton Flavor Violating Radiative Decays $l_i \to l_j γ$ in G2HDM
论文作者
论文摘要
我们在最小的G2HDM中计算$ L_IL_Jγ$顶点的电磁形式因子，该级别的G2HDM具有子GEV矢量暗物质候选者。结果适用于违反Lepton风味的辐射衰减率$ L_I \至L_Jγ$，以及带电的Lepton的异常磁偶极矩和电偶极力矩。要从数值计算$μ\至Eγ$的分支比率，并与MEG的最新实验限制进行比较，我们调整了先前的参数空间扫描，这与直接搜索深色物质，$ W $和$ Z $质量测量值的物品密度和约束是一致的，以及LHC HIG higs信号的强度和Invis sign -Invis wide and vers and Invis signal nibs grouds。虽然额外的贡献至少比Muon异常中的$ \ sim4.2σ$差异所需的数量级要小，但现有的MEG限制对参数空间施加了严格的约束。剩余的可行参数空间可以通过$μ\至eγ$的MEG II灵敏度以及可预见的将来的Sub-GEV暗物质的直接搜索。较高的循环贡献对于解决MUON异常的差异并为G2HDM中的标准模型夸克和Leptons生成了非散热的电偶极矩。
We compute the electromagnetic form factors of the $l_i l_j γ$ vertex at one-loop level in the minimal G2HDM which has a sub-GeV vector dark matter candidate. The results are applied to the radiative decay rates for the charged lepton flavor violating processes $l_i \to l_j γ$, and the anomalous magnetic dipole moment and the electric dipole moment of the charged lepton. To numerically compute the branching ratio for $μ\to e γ$ and compare with the latest experimental limit from MEG, we adapt our previous parameter space scan that is consistent with the relic density and constraints from direct searches of dark matter, $W$ and $Z$ mass measurements, as well as the LHC Higgs signal strengths and invisible width. While the extra contributions are at least an order of magnitude smaller than required to explain the $\sim 4.2 σ$ discrepancy in the muon anomaly, the existing MEG limit imposes stringent constraint on the parameter space. The remaining viable parameter space can be further probed by the MEG II sensitivity for $μ\to e γ$ as well as from the direct searches of sub-GeV dark matter in foreseeable future. Higher loop contributions may be significant to resolve the discrepancy in the muon anomaly and generate a non-vanishing electric dipole moments for the standard model quarks and leptons in G2HDM.
