Effective field theory interpretation of lepton magnetic and electric dipole moments
Effective field theory interpretation of lepton magnetic and electric dipole moments
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DOI：
10.1007/jhep07(2021)107
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发表时间：
2021-02
影响因子：
5.4
通讯作者：
Jason Aebischer;W. Dekens;E. Jenkins;A. Manohar;D. Sengupta;P. Stoffer
中科院分区：
文献类型：
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作者：
Jason Aebischer;W. Dekens;E. Jenkins;A. Manohar;D. Sengupta;P. Stoffer
本文对μ子和电子的磁偶极矩和电偶极矩进行了与模型无关的分析，给出了用低能有效场论（LEFT）和标准模型有效场论（SMEFT）的算符系数表示的偶极矩表达式。我们使用单圈重整化群改进的微扰理论，包括从SMEFT到LEFT的单圈匹配，以及有效理论算符的单圈轻子矩阵元。包含轻夸克的半轻子四费米子算符对偶极矩有相当大的非微扰贡献，这也包括在我们的分析中。我们发现，只有一个非常有限的SMEFT运营商能够产生当前的μ子磁矩偏离其标准模型的期望。
We perform a model-independent analysis of the magnetic and electric dipole moments of the muon and electron. We give expressions for the dipole moments in terms of operator coefficients of the low-energy effective field theory (LEFT) and the Standard Model effective field theory (SMEFT). We use one-loop renormalization group improved perturbation theory, including the one-loop matching from SMEFT onto LEFT, and one-loop lepton matrix elements of the effective-theory operators. Semileptonic four-fermion operators involving light quarks give sizable non-perturbative contributions to the dipole moments, which are included in our analysis. We find that only a very limited set of the SMEFT operators is able to generate the current deviation of the magnetic moment of the muon from its Standard Model expectation.