THE SUPERSYMMETRIC TWO-LOOP CORRECTIONS TO MUON MAGNETIC DIPOLE MOMENTS IN THE CP-VIOLATING MSSM
THE SUPERSYMMETRIC TWO-LOOP CORRECTIONS TO MUON MAGNETIC DIPOLE MOMENTS IN THE CP-VIOLATING MSSM
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DOI：
10.1142/s0217732312500459
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发表时间：
2012-05
影响因子：
1.4
通讯作者：
Shu-Min Zhao;T. Feng;Tong Li;Xue–qian Li;Ke-Sheng Sun
中科院分区：
文献类型：
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作者：
Shu-Min Zhao;T. Feng;Tong Li;Xue–qian Li;Ke-Sheng Sun
利用有效拉格朗日方法，在CP破坏的最小超对称推广下，研究了由电荷中微子、中性中微子、中性中微子组成的特殊双环拓扑图对μ子磁偶极矩的电弱修正.在考虑电磁规范不变性的情况下，我们得到了引起轻子磁偶极矩的六维算符的Wilson系数。采用零动量相减方案，消除了发散子图引起的紫外发散。数值计算结果表明，该扇区对μ子磁偶极矩的双圈超对称修正可以超过10-10，与目前的实验精度相当.
Using the effective Lagrangian method, we study the electroweak corrections to the magnetic dipole moment of muon from some special two-loop topological diagrams which are composed of chargino–sneutrino, neutralino–slepton, slepton–sneutrino, in the CP-violating minimal supersymmetric extension of the standard model. Considering the electromagnetic gauge invariance, we obtain the Wilson coefficients of those dimension 6 operators which induce the magnetic dipole moment of leptons. Adopting the zero-momentum substraction scheme, we remove the ultra-violet divergences induced by the divergent sub-diagrams. The numerical results indicate that the two-loop supersymmetric corrections from this sector to the muon magnetic dipole moment can exceed 10-10, which is the same order of present experimental precision.