Baryogenesis via flavoured leptogenesis in a minimal type-II seesaw model

TL;DR

This paper investigates baryogenesis through flavoured leptogenesis in a minimal type-II seesaw model, highlighting the role of right-handed neutrino decay and CP violation in generating the matter-antimatter asymmetry.

Contribution

It introduces a minimal extension with a right-handed neutrino and triplet scalar, analyzing flavoured leptogenesis with Fritzsch textures and linking low- and high-energy CP violation.

Findings

Enhanced baryon asymmetry in two-flavour regime

CP violation correlation between low and high energies

Parameter space consistent with neutrino oscillation data

Abstract

We study baryogenesis via leptogenesis in an extension of the Standard Model by adding one right-handed neutrino and one triplet scalar. These heavy particles contribute to the generation of tiny neutrino mass through seesaw mechanism. The contribution of the heavy particles to the neutrino masses is inversely proportional to their corresponding masses. Considering leptogenesis is achieved by the decay of the right-handed neutrino, the new source of CP asymmetry comes solely from the decay of the right-handed neutrino with one-loop vertex diagram involving the triplet scalar. The predictiveness of the model is enhanced by introducing Fritzsch-type textures for the neutrino mass matrix and charged lepton mass matrix. We execute the parameter space study following the latest neutrino oscillation data. We study baryogenesis via leptogenesis in the two-flavoured regime, using the zero textures, and show that there is an enhancement in baryon asymmetry as compared to the unflavoured regime. For two-flavour leptogenesis we consider the suitable temperature regime $T\subset\left[10^{10},10^{11}\right]$ GeV. We also study the common correlation of CP violation between low and high-energy regimes using the geometrical description of CP violation in terms of unitarity triangle.