Phenomenological study of neutrino mass, dark matter and baryogenesis within the framework of minimal extended seesaw

TL;DR

This paper presents a minimal extended seesaw model incorporating flavor symmetries to explain neutrino masses, dark matter stability, and baryogenesis, with detailed scalar sector analysis and implications for dark matter parameter space.

Contribution

It introduces a novel minimal extended seesaw framework with specific flavor symmetries and detailed scalar sector analysis to address neutrino mass, dark matter, and baryogenesis.

Findings

Successful generation of leptonic mixing with broken $$ symmetry.

Verification of baryon asymmetry via thermal leptogenesis.

Impact of extra scalar particles on dark matter and fermionic sectors.

Abstract

We study a model of neutrino and dark matter within the framework of a minimal extended seesaw. This framework is based on $A_4$ flavor symmetry along with the discrete $Z_4$ symmetry to stabilize the dark matter and construct desired mass matrices for neutrino mass. We use a non-trivial Dirac mass matrix with broken $\mu - \tau$ symmetry to generate the leptonic mixing. A non-degenerate mass structure for right-handed neutrinos is considered to verify the observed baryon asymmetry of the Universe via the mechanism of thermal Leptogenesis. The scalar sector is also studied in great detail for a multi-Higgs doublet scenario, considering the lightest $Z_4$-odd as a viable dark matter candidate. A significant impact on the region of DM parameter space, as well as in the fermionic sector, are found in the presence of extra scalar particles.