A lepton model with nearly Cobimaximal mixing

TL;DR

This paper proposes a lepton model based on S3 flavor symmetry within a B-L gauge framework, which modifies Cobimaximal mixing predictions to align with current neutrino data and offers testable predictions for future experiments.

Contribution

It introduces a novel S3 flavor symmetry model that breaks Cobimaximal mixing predictions, fitting current data and providing testable predictions for the Dirac CP phase.

Findings

Model accommodates current neutrino mixing data

Predicts regions for the Dirac CP phase testable in future experiments

Reconciles Cobimaximal mixing with experimental observations

Abstract

Cobimaximal mixing predicts $\pi/4$ and $3\pi/2$ for the atmospheric angle and the Dirac CP-violating phase, respectively. These values are in tension with the neutrino globals fits. If this pattern was behind the lepton mixings, then it would have to be broken. In that case, in this paper, we explore the $\mathbf{S}_{3}$ flavor symmetry within the $B-L$ gauge model where the aforementioned scheme comes from the neutrino sector but the charged lepton contribution breaks the well known predictions so the mixing observables as well as the $m_{ee}$ mass can be accommodated quite well according to the available data. Notably, the predicted regions for the Dirac CP-violating phase would allow us to test the model in future experiments.