Neutrinos in the flavor-dependent $U(1)_F$ model

TL;DR

This paper explores a flavor-dependent $U(1)_F$ model that naturally explains neutrino masses and mixing, aligning well with experimental data, and analyzes the impact of CP phases on neutrino magnetic moments.

Contribution

It introduces a $U(1)_F$ model that addresses neutrino flavor mixing and mass hierarchy, predicting a massless lightest neutrino and consistent mixing parameters.

Findings

Lightest neutrino is naturally massless.

Predicted neutrino parameters match experimental data.

CP phases influence neutrino magnetic dipole moments.

Abstract

The neutrino oscillation experiments provide definitive evidence of new physics beyond the Standard Model (SM), and the neutrino mass-squared differences and flavor mixing have been precisely measured. This study examines the neutrino sector within the flavor-dependent $U(1)_F$ model, where the unique fermion sector can simultaneously address both the flavor mixing puzzle and the mass hierarchy puzzle. It is found that the lightest neutrino is naturally massless in this model, and the predicted neutrino mass-squared differences, flavor mixing angles, Dirac CP phase agree well with the experimental measurements. Additionally, the effects of the Dirac CP phase and Majorana CP phase on the theoretical predictions of the neutrino transition magnetic dipole moments are analyzed.