Flavour leptogenesis with tribimaximal mixings and beyond

TL;DR

This paper analyzes how different neutrino mass models and flavour effects influence the baryon asymmetry generated through thermal leptogenesis, highlighting the normal hierarchical model's predictive strength and the enhancement due to flavour effects.

Contribution

It compares baryon asymmetry predictions across various neutrino mass models with and without flavour effects, using the inverse seesaw formula for constructing mass matrices.

Findings

Normal hierarchical model predicts the best baryon asymmetry.

Flavour effects enhance the baryon asymmetry in thermal leptogenesis.

Analysis helps discriminate between neutrino mass models.

Abstract

We compute and compare the baryon asymmetry of the universe in thermal leptogenesis scenario with and without flavour effects for different neutrino mass models namely degenerate, inverted hierarchical and normal hierarchical models, with tribimaximal mixings and beyond. Considering three possible diagonal forms of Dirac neutrino mass matrices $m_{LR}$, the right-handed Majorana mass matrices $M_{RR}$ are constructed from the light neutrino mass matrices $m_{LL}$ through the inverse seesaw formula. The normal hierarchical model is found to give the best predictions of the baryon asymmetry for both cases. This analysis serves as an additional information in the discrimination of the presently available neutrino mass models. Moreover, the flavour effects is found to give enhancement of the baryon asymmetry in thermal leptogenesis.