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arXiv 0805.1122hep-ph
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轻子反常磁矩和电偶极矩的电弱和超对称双圈修正

Electroweak and supersymmetric two-loop corrections to lepton anomalous magnetic and electric dipole moments

Tai-Fu Feng, Lin Sun, Xiu-Yi Yang

摘要:

利用有效拉格朗日方法,分析了在CP破坏的标准模型的最小超对称扩展中,在相应的两个Higgs偶极单圈图中插入一个封闭的中性伴子/荷子圈的特殊双圈图对轻子反常偶极矩的电弱修正.考虑到圈动量的平移不变性和电磁规范不变性,我们得到了所有的6维算符,并导出了它们的系数。将运动方程应用于外轻子,得到了轻子的反常偶极矩。数值结果表明,存在一个参数空间,在这个空间中,该扇区对μ子反常偶极矩的贡献可能是显著的。

英文摘要:

Using the effective Lagrangian method, we analyze the electroweak corrections to the anomalous dipole moments of lepton from some special two-loop diagrams where a closed neutralino/chargino loop is inserted into relevant two Higgs doublet one-loop diagrams in the minimal supersymmetric extension of the standard model with CP violation. Considering the translational invariance of loop momenta and the electromagnetic gauge invariance, we get all dimension 6 operators and derive their coefficients. After applying equations of motion to the external leptons, we obtain the anomalous dipole moments of lepton. The numerical results imply that there is parameter space where the contributions to the muon anomalous dipole moments from this sector may be significant.

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