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

TL;DR

This paper calculates two-loop electroweak corrections in the minimal supersymmetric standard model, revealing potential significant contributions to the muon’s anomalous magnetic dipole moment from specific diagrams involving neutralinos and charginos.

Contribution

It provides a detailed analysis of two-loop electroweak corrections using the effective Lagrangian method, focusing on CP violation effects in supersymmetric models.

Findings

Potentially significant contributions to muon g-2 from supersymmetric two-loop diagrams.

Derivation of all relevant dimension 6 operators and their coefficients.

Numerical analysis indicating parameter space with notable effects.

Abstract

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.