Neutrino observables in gauged $U(1)_{L_\alpha-L_\beta}$ models with two Higgs doublet and one singlet scalars

TL;DR

This paper explores neutrino mass generation in models with extended scalar sectors and a gauged $U(1)_{L_eta - L_eta}$ symmetry, showing more flexible mass structures and better compatibility with experimental data.

Contribution

It introduces a neutrino mass matrix in models with two Higgs doublets and a singlet scalar under $U(1)_{L_eta - L_eta}$, expanding the parameter space and fitting data better than minimal models.

Findings

Sum of neutrino masses can be lower than in minimal models.

Models can fit neutrino data for $U(1)_{L_e - L_{ au}}$ which minimal models disfavor.

Correlations between neutrino mass sum and CP phases are identified.

Abstract

We discuss neutrino sector in models with two Higgs doublet and one singlet scalar fields under local $U(1)_{L_\alpha- L_\beta}$ symmetry. A neutrino mass matrix is formulated for these models where the matrix is generated via type-I seesaw mechanism introducing right-handed neutrinos. The neutrino mass matrix has more degrees of freedom compared to minimal scenarios which have only one new scalar field, but its structure is still restricted by the symmetry. Then it is find that sum of neutrino mass can be lower than minimal scenarios and it is easier to satisfy observed constraints. In addition, we can fit neutrino data for $U(1)_{L_e - L_{\mu(\tau)}}$ cases which are disfavored in minimal models. Furthermore, some correlations among sum of neutrino mass and CP violating phases are still found although we have more free parameters.