Seesaw mechanism with four texture zeros in the neutrino Yukawa matrix

TL;DR

This paper explores a specific neutrino mass model with four texture zeros in the Yukawa matrix, leading to predictions for neutrino properties and implications for leptogenesis, based on recent neutrino oscillation data.

Contribution

It introduces a neutrino mass model with four texture zeros in the Yukawa matrix, reducing parameters and enabling predictions for neutrino observables and leptogenesis constraints.

Findings

Predictions for the lightest neutrino mass and CP phase.

Strong correlations between texture zero models and mass ordering.

Additional constraints on leptogenesis parameter space.

Abstract

With the recent observation of nonzero \theta_{13}, five neutrino oscillation parameters are now known. By imposing four zeros in the Yukawa coupling matrix of the type I seesaw model, the number of parameters in the neutrino mass matrix is reduced to seven, and we are able to make predictions for the lightest neutrino mass, Dirac CP phase, and neutrinoless double beta decay. Four texture zeros in the Yukawa coupling matrix is equivalent to either a single texture zero or a single cofactor zero for an off-diagonal element of the light neutrino mass matrix. We find strong similarities between single texture zero models with one mass ordering and single cofactor zero models with the opposite mass ordering. In the context of a specific class of single-flavor leptogenesis models, we find additional constraints on the parameter space.