One-Zero Neutrino Textures and Resonant Type-II Leptogenesis: Flavor-Resolved Thermal Evolution and Baryon Asymmetry

TL;DR

This paper explores how specific neutrino mass textures within resonant Type-II leptogenesis can explain the observed baryon asymmetry, emphasizing flavor effects and thermal evolution.

Contribution

It provides a detailed analysis of one-zero neutrino textures' compatibility with leptogenesis and baryogenesis, including flavor-resolved dynamics and Boltzmann equation simulations.

Findings

Several one-zero textures are compatible with neutrino oscillation data.

Resonant enhancement allows sizable CP asymmetries in these textures.

Flavor-dependent washout effects significantly influence the final baryon asymmetry.

Abstract

We investigate the viability of one-zero neutrino mass textures within the framework of resonant Type-II leptogenesis. Considering a two-triplet scalar realization of the Type-II seesaw mechanism, we analyze the compatibility between neutrino texture structures, CP asymmetry generation, and the observed baryon asymmetry of the Universe. We perform extensive numerical scans over the neutrino parameter space and classify the phenomenologically viable one-zero textures under both hierarchical and resonant leptogenesis scenarios. We show that several one-zero textures remain compatible with neutrino oscillation data while simultaneously generating sizable CP asymmetries through resonant enhancement. We further investigate the thermal evolution of the generated asymmetry using Boltzmann equations and demonstrate the freeze-out behavior of the baryon asymmetry. Extending the analysis to a flavor-resolved framework, we study the separate evolution of electron, muon, and tau asymmetries and show that flavor-dependent washout effects play a crucial role in determining the final baryon asymmetry. Our analysis establishes a direct connection between neutrino flavor textures, resonant thermal leptogenesis, and flavor-dependent baryogenesis dynamics.