Minimal muon anomalous magnetic moment

TL;DR

This paper classifies potential one-particle extensions of the Standard Model that could explain the muon anomalous magnetic moment discrepancy, identifying specific particles that could be tested in future collider experiments.

Contribution

It completes the classification of Standard Model extensions affecting the muon g-2, including a new calculation for a fermionic doublet with hypercharge -3/2.

Findings

Only two scalar leptoquarks and a pseudoscalar from a two-Higgs-doublet model can explain the muon g-2 discrepancy.

These particles could be detected in upcoming LHC runs, especially via final states with tops and muons.

Abstract

We classify all possible one-particle (scalar and fermion) extensions of the Standard Model that can contribute to the anomalous magnetic moment of leptons. We review the cases already discussed in the literature and complete the picture by performing the calculation for a fermionic doublet with hypercharge -3/2. We conclude that, out of the listed possibilities, only two scalar leptoquarks and the pseudoscalar of a peculiar two-Higgs-doublet model could be the responsibles for the muon anomalous magnetic moment discrepancy. Were this the case, this particles could be seen in the next LHC run. To this aim, especially to test the leptoquark hypothesis, we suggest to look for final states with tops and muons.