Common origin of radiative neutrino mass, dark matter and leptogenesis in scotogenic Georgi-Machacek model

TL;DR

This paper investigates a modified Georgi-Machacek model that links neutrino mass, dark matter, and leptogenesis through radiative mechanisms, exploring its phenomenology and parameter space consistent with current observations.

Contribution

It introduces a new extended Georgi-Machacek model with specific symmetries that naturally connects neutrino mass, dark matter, and leptogenesis, providing a comprehensive phenomenological analysis.

Findings

Viable dark matter candidate identified

Parameter space consistent with neutrino data found

Leptogenesis mechanism demonstrated in the model

Abstract

We explore the phenomenology of the Georgi-Machacek model extended with two Higgs doublets and vector fermion doublets invariant under $SU(2)_L \times U(1)_Y\times \mathcal {Z}_4 \times \mathcal {Z}_2$. The $\mathcal {Z}_4$ symmetry is broken spontaneously while the imposed $\mathcal {Z}_2$ symmetry forbids triplet fields to generate any vacuum expectation value and leading to an inert dark sector providing a viable candidate for dark matter and generate neutrino mass radiatively. Another interesting feature of the model is leptogenesis arising from decay of vector-like fermions. A detailed study of the model is pursued in search for available parameter space consistent with the theoretical and experimental observations for dark matter, neutrino physics, flavor physics, matter-antimatter asymmetry in the Universe.