Leptogenesis and Yukawa textures

TL;DR

This paper investigates how specific fermion mass textures influence leptogenesis, demonstrating that texture hierarchy and zeros are crucial for generating the universe's observed baryon asymmetry.

Contribution

It introduces a set of fermion textures with the Dirac neutrino pattern matching the up quark texture, analyzing their impact on leptogenesis viability.

Findings

Texture hierarchy affects leptogenesis success

Placement of zeros in textures is critical

Models can produce observed baryon asymmetry

Abstract

We study a set of textures giving rise to correct masses and mixings of the charged fermions in the context of leptogenesis. The Dirac neutrino texture pattern is assumed to be identical with the up quark texture. The heavy Majonana neutrino mass matrix is obtained by inverting the type-I see-saw formula and using the neutrino masses and mixings required by the solar and atmospheric neutrino oscillation experiments as input. After making the feasibility study of the generated lepton asymmetry via the decay of the heavy right handed neutrino, we compute the generated baryon asymmetry by numerically solving the supersymmetric Boltzmann equations. We find for these models that both the hierarchy of the texture as well as the placement of the texture zeros are important to the viability of leptogenesis as the source of the observed baryon asymmetry of the universe.