A Note on One Loop Electroweak Contributions to g-2: a Companion to BUHEP-01-16

TL;DR

This paper provides general one-loop formulas for calculating electroweak contributions to the anomalous magnetic moment of charged fermions, applicable to the Standard Model and beyond, aiding future theoretical and phenomenological studies.

Contribution

It offers comprehensive, adaptable expressions for electroweak contributions to g-2, including various scalar and gauge boson interactions, useful for analyzing new physics scenarios.

Findings

Reproduces Standard Model electroweak contributions to g-2.

Provides formulas adaptable to new physics models.

Facilitates calculations involving different scalar and gauge boson couplings.

Abstract

In this note we present general expressions at one loop order that can be used to calculate the contributions to the anomalous magnetic moment of fundamental, charged Dirac fermions. In particular, we provide the expressions for charged and neutral scalar and charged and neutral gauge boson contributions with general vector and axial couplings to the fermion of interest. The calculations presented in this note were originally derived for use in the author's letter, hep-ph/0108080. We have chosen to document and make available the results and derivations in the hope that they will also be useful to others. Our expressions reproduce the Standard Model electroweak contributions to a_muon in the appropriate mass limits, and are flexible enough to allow us to handle many scenarios of new physics beyond the Standard Model.