次领头阶下类矢量轻子产生的偶极椭圆
The dipole ellipse from vector-like leptons at next-to-leading order
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中文总结 AI 辅助
该研究在SM扩展第四代类矢量轻子的模型中,利用SMEFT计算次领头阶下偶极矩与希格斯耦合的关联,发现修正使缪子偶极椭圆收缩,更多参数空间与SM缪子磁矩值相容。
中文摘要 AI 辅助
我们考虑在标准模型(SM)中加入第四代类矢量轻子的扩展模型,该模型会对轻子质量、希格斯耦合及偶极矩产生强关联贡献。领头阶下,希格斯耦合将磁偶极矩与电偶极矩限制在一个椭圆内;本文利用标准模型有效场论(SMEFT)框架,计算希格斯耦合的单圈修正与偶极矩的两圈修正,以得到次领头阶下的关联结果,同时通过SMEFT重整化群方程对来自SM耦合的领头对数修正进行重求和。基于这些结果,我们计算了重整化群改进的次领头阶关联,并讨论其对缪子、电子及陶子关联的意义;具体而言,对于缪子,我们发现修正会使该椭圆收缩,从而有更大的参数空间区域与更新后的SM缪子磁矩值相容。
英文摘要
We consider the SM extended by a 4th generation of vector-like leptons. This model generates strongly correlated contributions to the lepton masses, Higgs couplings and dipole moments. At leading order the Higgs coupling restricts the magnetic and electric dipole moments to an ellipse. Here we compute the one-loop corrections to the Higgs coupling and two-loop corrections to the dipole moments to obtain the correlation at next-to-leading order using the framework of SMEFT. In addition we resum the leading logarithmic corrections from SM couplings through the SMEFT renormalisation group equations. With these results we compute the RG improved correlation at NLO and discuss the implications for the muon, electron and tau correlations. Specifically, for the muon we find that the corrections contract the ellipse such that a larger part of parameter space becomes compatible with the updated SM value of the muon magnetic moment.
发表机构
- Institut für Kern- und Teilchenphysik, TU Dresden(德累斯顿工业大学核与粒子物理研究所)
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