Abstract

In order to explain the observed nonzero value of the mixing angle \(\theta _{13}\), we have analyzed the neutrino mass matrix generated by a \(A_4\) flavor symmetric type-I seesaw. The vacuum expectation value (vev) of a flavon induces the nonzero \(\theta _{13}\) by breaking the exact tribimaximal (TBM) pattern. The Majorana phases involved in the lepton mixing matrix are modified in presence of this vev as compared to the TBM case. So, a lepton asymmetry in this model is viable, once the next-to-leading order contribution to the neutrino Yukawa coupling is considered.

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