Muon $g-2$ Anomaly from Vector-like Leptons in a 2-Higgs-doublet + Scalar Singlet Model

TL;DR

This paper explores a minimal extension of the Standard Model with vector-like leptons and scalars to explain the muon g-2 anomaly, analyzing its phenomenological implications in light of recent Fermilab results.

Contribution

It introduces a simplified model with vector-like leptons and scalars that accounts for the muon g-2 anomaly and discusses its phenomenological consequences.

Findings

Model successfully explains the muon g-2 anomaly.

Implications for lepton-flavor universality and Higgs decays analyzed.

Constraints from lepton-flavor violating decays considered.

Abstract

We revisit an economical model for the $g-2$ anomaly featuring a vector-like charged fermion, a scalar doublet and a scalar singlet in the light of new results from Fermilab. The phenomenological implications for lepton-flavor universality, Higgs decays, and charged lepton-flavor violating decays are discussed in detail.