On the Dipole Moments of Fermions at Two Loops

TL;DR

This paper discusses the calculation of two-loop electroweak corrections to fermion dipole moments, showing that the Standard Model predicts a vanishing electric dipole moment at this order, and presents a simplified proof of this fact.

Contribution

It provides a simplified proof that the Standard Model predicts zero electric dipole moments for fermions at two loops, extending previous calculations of magnetic moments.

Findings

Standard Model EDM vanishes at two loops

Techniques from magnetic moment calculations apply to EDM

Simplified proof of EDM null result

Abstract

Complete two-loop electroweak corrections to leptonic anomalous magnetic moments have been calculated recently using asymptotic expansions of Feynman diagrams. Techniques developed in that context can also be applied to the electric dipole moments (EDM) of fermions. In the Standard Model the EDM was proved to vanish at two loops. In this talk we discuss a simplification of that proof.