Axion-like particles, two-Higgs-doublet models, leptoquarks, and the electron and muon g-2

TL;DR

This paper reviews how various new physics models like axion-like particles, two-Higgs-doublet models, and leptoquarks can explain the discrepancies in the muon and electron g-2 measurements, considering experimental constraints.

Contribution

It provides a comparative analysis of different beyond-standard-model scenarios in explaining g-2 anomalies, highlighting which models remain viable.

Findings

Type-I, Type-II, and Type-Y two-Higgs-doublet models fit the data well.

Other models are constrained by existing experimental data.

The study narrows down plausible new physics explanations for g-2 discrepancies.

Abstract

Data from the Muon g-2 experiment and measurements of the fine structure constant suggest that the anomalous magnetic moments of the muon and electron are at odds with standard model expectations. We survey the ability of axion-like-particles, two-Higgs-doublet models and leptoquarks to explain the discrepancies. We find that accounting for other constraints, all scenarios except the Type-I, Type-II and Type-Y two-Higgs-doublet models fit the data well.