Cobimaximal Neutrino Mixing from $A_4$ and its Possible Deviation

Abstract

It has recently been shown that the phenomenologically successful pattern of cobimaximal neutrino mixing (${\theta }_{13}\ne 0$, ${\theta }_{23}=\pi /4$, and ${\delta }_{CP}=\pm \pi /2$) may be achieved in the context of the non-Abelian discrete symmetry $A_4$, if the neutrino mass matrix is diagonalized by an orthogonal matrix $\mathcal{O}$. We study how this pattern would deviate if $\mathcal{O}$ is replaced by an unitary matrix.

arXiv comment10 pages, no figure

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• Low scale type I seesaw model for lepton masses and mixings
• Controlled fermion mixing and FCNCs in a $\Delta (27)$ 3+1 Higgs Doublet Model
• Deviations to $\mu -\tau$ symmetry in a cobimaximal scenario
• Multiscalar $B-L$ extension based on $S_4$ flavor symmetry for neutrino mass and mixing
• Phenomenology of an Extended $1+2$ Higgs Doublet Model with $S_3$ Family Symmetry
• An extended 3-3-1 model with two scalar triplets and linear seesaw mechanism
• Approximate magic symmetry in a cobimaximal scenario of Majorana neutrinos
• Fermion masses and mixings and charged lepton flavor violation in a 3-3-1 model with inverse seesaw