Deviations from tribimaximal neutrino mixing using a model with Δ(27) symmetry

We present a model of neutrino mixing based on the flavor group Delta(27) in order to account for the observation of a nonzero reactor mixing angle (theta(13)). The model provides a common flavor structure for the charged-lepton and the neutrino sectors, giving their mass matrices a "circulant-plus-diagonal" form. Mass matrices of this form readily lead to mixing patterns with realistic deviations from tribimaximal mixing, including nonzero theta(13). With the parameters constrained by existing measurements, our model predicts an inverted neutrino mass hierarchy. We obtain two distinct sets of solutions in which the atmospheric mixing angle lies in the first and the second octants. The first (second) octant solution predicts the lightest neutrino mass, m(3) similar to 29 meV (m(3) similar to 65 meV) and the CP phase, delta(CP) similar to -pi/4 (delta(CP) similar to pi/2), offering the possibility of large observable CP violating effects in future experiments.