Resolving Muon g-2 Anomaly With Partial Compositeness

TL;DR

This paper proposes that the muon g-2 anomaly can be explained by composite Higgs models with partial compositeness, where TeV-scale muon partners with large Yukawa couplings provide the necessary one-loop correction.

Contribution

It introduces a novel composite Higgs framework with partial compositeness to resolve the muon g-2 anomaly, differing from vectorlike lepton models, and analyzes experimental constraints.

Findings

Muon g-2 anomaly can be explained by TeV-scale composite muon partners.

Parameter space with lighter muon partners below 325 GeV is excluded at 2σ by Drell-Yan processes.

The model's parameter space is consistent with current Higgs, Z, and electroweak precision measurements.

Abstract

We consider the scenario of composite Higgs with partial compositeness to address the muon g-2 anomaly. We show that this anomaly is resolved by one-loop correction due to composite muon partners with mass scale of order TeVs and large Yukawa coupling to composite Higgs, which is different from interpretations of vectorlike lepton models. We present parameter space by imposing indirect constraints from precise measurements on Higgs, Z and oblique electroweak parameters. We analyze direct constraints in light of both Drell-Yan and Higgs-associated productions of the composite muon partners at high-luminosity LHC. It turns out that the surviving parameter regions with the lighter composite muon mass below $\sim 325$ GeV can be excluded at 2$\sigma$ order by the Drell-Yan processes.