The hadronic light-by-light contribution to the muon anomalous magnetic moment and renormalization group for EFT

TL;DR

This paper reviews the theoretical aspects of the muon anomalous magnetic moment, focusing on the hadronic light-by-light contribution, pion loops, and renormalization group methods within effective field theory.

Contribution

It clarifies the differences between models for pion loops and discusses leading logarithms in chiral perturbation theory relevant to the muon g-2.

Findings

Comparison of hidden local symmetry and VMD models for pion loops

Analysis of leading logarithms in chiral perturbation theory

Overview of the hadronic light-by-light contribution to muon g-2

Abstract

We give a short overview of the theory of the muon anomalous magnetic moment with emphasis on the hadronic light-by-light and the pion loop contribution. We explain the difference between the hidden local symmetry and full VMD pion loop and discuss leading logarithms in the anomalous sector of 2-flavour chiral perturbation theory.