TeV Scale Resonant Leptogenesis with triplet Fermion in Connection to Muon $g-2$

TL;DR

This paper extends a scotogenic model with a triplet fermion and scalar, linking TeV-scale resonant leptogenesis to muon g-2 and dark matter, proposing a unified explanation consistent with experimental data.

Contribution

It introduces a novel model connecting leptogenesis, muon g-2, and dark matter via a triplet fermion and scalar with specific symmetries, providing a viable parameter space at TeV scale.

Findings

Viable TeV-scale leptogenesis parameter space identified.

Model explains muon g-2 anomaly and dark matter simultaneously.

Consistent with Fermi Lab muon g-2 results.

Abstract

We propose an extension of the minimal scotogenic model with a triplet fermion and a singlet scalar. An imposed $Z_{4}\times Z_{2}$ symmetry allows only diagonal Yukawa couplings among different generations of SM leptons and right-handed singlet neutrinos. The Yukawa coupling of the triplet fermion with the inert doublet positively contributes to the muon anomalous magnetic moment. The imposed $Z_{4}\times Z_{2}$ symmetry forbids the conventional leptogenesis from the lightest right-handed neutrino decay. A net lepton asymmetry can be generated in the muonic sector from $N_{2}$ and triplet fermion decay through resonant leptogenesis scenario. The Yukawa coupling of triplet plays significant role both in leptogenesis and in the anomalous magnetic moment of the muon. We show a viable parameter space for TeV scale leptogenesis while explaining the Fermi lab results. The inert scalar is the dark matter candidate in this model. The Muon $(g-2)$ and dark matter both favor the same parameter space for mass of the dark matter and the triplet fermion.