Anomalous muon magnetic moment in a left-right symmetric composite model

TL;DR

This paper calculates the muon anomalous magnetic moment in a left-right symmetric composite model, showing that excited leptons contribute via a single Feynman diagram analogous to the Standard Model process.

Contribution

It introduces a novel calculation of muon magnetic moment contributions from excited leptons in a left-right symmetric compositeness framework, highlighting a simplified one-loop contribution.

Findings

Excited leptons contribute to muon magnetic moment at one loop.

The contribution arises from a single Feynman diagram.

The diagram is analogous to the Standard Model contribution.

Abstract

We calculate the anomalous magnetic moment for muons at one loop level arising from left right symmetric excited leptons which are excited states of known standard model leptons. Such excited states arise in compositeness theories where the known leptons are assumed to be made of more fundamental particles. In this work, we assume that the excited leptons possess a left right symmetry also. We show that at the one loop level, the QED contribution to the muon anomalous magnetic moment from these excited leptons comes from only one Feynman diagram, which turns out to be a natural analog of the only diagram contributing to anomalous muon magnetic moment in the Standard Model.