Exploring solutions to the muon g-2 anomaly in a 3-3-1 model under flavor constraints

TL;DR

This paper investigates whether a pseudoscalar in a 3-3-1 model can explain the muon g-2 anomaly while satisfying flavor physics constraints, finding a viable parameter space around 66 GeV pseudoscalar mass.

Contribution

It demonstrates that a specific pseudoscalar in the 3-3-1 model can account for the muon g-2 anomaly without violating flavor constraints, under certain parameter conditions.

Findings

A pseudoscalar around 66 GeV can explain the g-2 anomaly.

The model remains consistent with B-meson decay and meson mixing constraints.

A high tan β value (58) is compatible with the observed anomaly.

Abstract

The magnetic moment of the muon can receive significant two-loop contributions from a light pseudoscalar. Notably, the spectrum of scalars of 3-3-1 models include one pseudoscalar. However this scalar spectrum inevitably gives rise to flavor-changing neutral current (FCNC) processes. In this study, we examine, within the 3-3-1 model with right-handed neutrinos, whether such spectrum of scalars can account for the anomalous magnetic moment of the muon, considering the constraints imposed by $B$-meson decays, meson mixing, and invisible Higgs decays. Our principal finding reveals that a pseudoscalar with mass around 66 GeV and $\tan \beta =58$ can account for the $g-2$ anomaly without conflicting with flavor physics.