标题： μ子g-2在大统一超对称理论中的贡献 显示英文标题

标题： Smuon contribution to muon g-2 in Grand Unified supersymmetric theories

摘要： 在GUT尺度约束（GUTc）的超对称（SUSY）模型中，smuon $\tilde{\mu}_1$ 的质量通常比stau $\tilde{\tau}_1$ 更重，而stau共湮灭是暗物质的典型湮灭机制。 然而，轻的smuon更符合muon $g-2$ 异常，因此smuon-中性子环路对muon $g-2$ 的贡献通常比sneutrino-带电子的小。 受最新缪子$g-2$结果的启发，我们以 GUTc-次最小超对称模型（NMSSM）为例，其中规范子（希格斯）质量并未统一到通常参数$M_{1/2}$($M_0$)，探讨其轻缪子微子的可能性及其对缪子$g-2$的贡献。经过复杂的计算和讨论，我们得出结论，在 GUTc-NMSSM 中，缪子微子可以比超tau轻。在这种轻缪子微子场景中，缪子微子-中性子环对缪子$g-2$的贡献可能大于中微子-带电子环的贡献。暗物质的湮灭机制主要由多个轻子或带电子共湮灭主导。在我们的计算中，我们也考虑了其他最新的相关约束，如希格斯数据、超对称搜索、暗物质残留密度和直接探测等。 显示英文摘要

摘要： In GUT-scale constrained (GUTc) supersymmetric (SUSY) models, the mass of smuon $\tilde{\mu}_1$ is typically heavier than that of stau $\tilde{\tau}_1$, and stau co-annihilation is a typical annihilation mechanism of dark matter. However, light smuon is more favored by the muon $g-2$ anomaly, thus smuon-neutralino loop contribution to muon $g-2$ is usually smaller than that of sneutrino-chargino. Inspired by the latest muon $g-2$ results, we take the GUTc- Next-to-Minimal Supersymmetric Model (NMSSM) as an example, where the gaugino (Higgs) masses are not unified to the usual parameter $M_{1/2}$ ($M_0$), exploring its possibility of light smuon and its contribution to muon $g-2$. After complicated calculations and discussions, we conclude that in GUTc-NMSSM the smuon can be lighter than stau. In this light-smuon scenario, the contribution of smuon-neutralino loop to the muon $g-2$ can be larger than that of the sneutrino-chargino loop. The annihilation mechanisms of dark matter are dominated by multiple slepton or chargino co-annihilation. In our calculations, we consider also other latest related constraints like Higgs data, SUSY searches, dark matter relic density and direct detections, etc.