Cobimaximal Neutrino Mixing from $S_3 \times Z_2$

TL;DR

This paper demonstrates how cobimaximal neutrino mixing can be realized using the $S_3 imes Z_2$ symmetry, offering an alternative to previous models based on $A_4$, and discusses the implications for scalar sector phenomenology.

Contribution

It introduces a new model achieving cobimaximal neutrino mixing with $S_3 imes Z_2$, replacing the $A_4$ symmetry and explores the resulting scalar sector phenomenology.

Findings

Successful realization of cobimaximal mixing with $S_3 imes Z_2$ symmetry.

Analysis of scalar sector phenomenology in the new model.

Comparison with $A_4$ based models.

Abstract

It has recently been shown that the phenomenologically successful pattern of cobimaximal neutrino mixing ($\theta_{13} \neq 0$, $\theta_{23} = \pi/4$, and $\delta_{CP} = \pm \pi/2$) may be achieved in the context of the non-Abelian discrete symmetry $A_4$. In this paper, the same goal is achieved with $S_3 \times Z_2$. The residual lepton $Z_3$ triality in the case of $A_4$ is replaced here by $Z_2 \times Z_2$. The associated phenomenology of the scalar sector is discussed.