Neutrino masses generation in a Z_4 model

TL;DR

This paper introduces a minimal renormalizable Z_4 flavor symmetry model that generates neutrino masses radiatively without right-handed neutrinos, fitting current fermion data and predicting an inverted neutrino mass hierarchy.

Contribution

It presents a novel minimal Z_4 flavor model with no right-handed neutrinos, using only two Higgs doublets and one scalar singlet to generate neutrino masses radiatively.

Findings

All fermion masses and mixing angles match experimental data.

The model predicts only an inverted neutrino mass hierarchy.

Analysis of neutrinoless double beta decay contributions.

Abstract

We present a renormalizable flavor model with Z_4 as flavor symmetry in both the quark and lepton sectors. The model is constructed with a minimal approach and no-right handed neutrinos are introduced. In this approach a minimum number of two SU(2) Higgs doublets and one scalar singlet are required in order to obtain the Nearest Neighbor Interaction form for charged fermions and to generate neutrino masses radiatively. For the quark sector we follow the charge assignations made by Branco et. al. in reference [1]. All fermion masses and mixing angles in the model are in agreement with current experimental data and only the inverted hierarchy for the neutrino mass spectrum is allowed. Since neutrinos are Majorana the contribution to neutrinoless double beta decay is also analyzed.