Heavy fermions and two loop corrections to (g−2)μ
Heavy fermions and two loop corrections to (g−2)μ
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DOI：
10.1016/j.physletb.2009.03.071
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发表时间：
2009-05
影响因子：
4.4
通讯作者：
Xiu-Yi Yang;T. Feng
中科院分区：
文献类型：
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作者：
Xiu-Yi Yang;T. Feng
本文应用有效拉格朗日方法和on-shell格式，分析了重费米子闭合环与虚规范玻色子或希格斯场连接的特殊双环图对轻子反常偶极矩的电弱修正。由于内环中虚费米子的质量远大于电弱尺度，我们明确地验证了如果希格斯粒子与重费米子之间的相互作用不包含非解耦耦合，则最终结果满足解耦定理。在解耦极限下，我们还从这两个环图中给出了标准模型的一些流行扩展中对轻子反常偶极矩的主要修正，例如第四代、超对称和具有t -奇偶性的最小希格斯。
Applying effective Lagrangian method and on-shell scheme, we analyze the electroweak corrections to anomalous dipole moments of lepton from some special two loop diagrams in which a closed heavy fermion loop is attached to the virtual gauge bosons or Higgs fields. As the masses of virtual fermions in inner loop are much heavier than the electroweak scale, we verify the final results satisfying the decoupling theorem explicitly if the interactions among Higgs and heavy fermions do not contain the nondecoupling couplings. At the decoupling limit, we also present the leading corrections to lepton anomalous dipole moments from those two loop diagrams in some popular extensions of the standard model, such as the fourth generation, supersymmetry, and the littlest Higgs with T-parity.