Leptonic $g-2$ anomaly in an extended Higgs sector with vector-like leptons

TL;DR

This paper proposes an extended Higgs sector model with vector-like leptons to explain the discrepancies in muon and electron magnetic dipole moments, constrained by collider and precision measurements.

Contribution

It introduces a novel extended 2HDM with singlet scalar and vector-like leptons, providing a unified explanation for lepton MDM anomalies within experimental constraints.

Findings

Allowed parameter space consistent with Higgs decay data

Simultaneous explanation of muon and electron MDM discrepancies

Constraints from LHC, LEP II, and electroweak precision tests

Abstract

We address the observed discrepancies in the anomalous magnetic dipole moments (MDM) of the muon and electron by extending the inert two Higgs Doublet Model (2HDM) with SM gauge singlet complex scalar field and singlet Vector-like Lepton (VLL) field. We obtain the allowed parameter space constrained from the Higgs decays to gauge Bosons at LHC, LEP II data and electro-weak precision measurements. The muon and electron MDM's are then explained within a common parameter space for different sets of allowed couplings and masses of the model particles.