Maximally restrictive leptonic texture zeros in two-Higgs-doublet models

TL;DR

This paper explores specific restrictive patterns of zeros in leptonic mass matrices within two-Higgs-doublet models with Majorana neutrinos, identifying only four compatible textures with observations and symmetries.

Contribution

It systematically classifies maximally restrictive leptonic texture zeros in two-Higgs-doublet models and identifies four textures consistent with experimental data and symmetry constraints.

Findings

Only four texture combinations are compatible with observations at 3 sigma.

These textures can be realized through Abelian symmetries.

The models' compatibility with lepton-flavor-violating constraints is analyzed.

Abstract

The implementation of maximally restrictive texture zeros in the leptonic sector is investigated in the context of two-Higgs-doublet models with Majorana neutrinos. After analyzing all maximally restrictive pairs of leptonic mass matrices with zero entries, we conclude that there are only four texture combinations that are compatible with observations at 3 sigma confidence level and can be implemented through Abelian symmetries in a two-Higgs-doublet model. The compatibility of these textures with current constraints on lepton-flavor-violating processes is also studied. The ultraviolet completion of these models is discussed in the framework of the seesaw mechanism for neutrino masses.