Beyond the Standard Model contributions to dipole moments

TL;DR

This paper provides an accessible introduction to how theories beyond the Standard Model can influence dipole moments, highlighting their sensitivity to new physics through key processes like muon g-2 and electron EDM.

Contribution

It offers a pedagogical overview focusing on dipole moments in BSM theories, emphasizing their importance and sensitivity, tailored for newcomers to the field.

Findings

Dipole observables are highly sensitive to new physics.

Key processes include muon g-2, electron EDM, and muon to electron gamma decay.

The review highlights the importance of simple models for understanding BSM effects.

Abstract

The goal of this work is to provide a pedagogical introduction to dipole moments and dipole transitions in theories beyond the Standard Model, with a focus on the lepton sector. We emphasize the exceptional sensitivity of dipole observables to new physics, analyzing the most sensitive processes, such as the muon anomalous magnetic moment, the electric dipole moment of the electron, and the branching ratio $\text{BR}(\mu \to e \gamma)$. This review is intended for PhD students, early-career researchers, and anyone entering the field for the first time. It does not aim to provide a complete overview of all models in the literature, but rather to serve as an accessible guide, using simple and representative examples from the most well-studied extensions of the Standard Model.