Nonzero θ13 signals nonmaximal atmospheric neutrino mixing

From recent groundbreaking experiments, it is now known that the Pontecorvo-Maki-Nakagawa-Sakata mixing differs significantly from the tribimaximal model in which θ₁₃=0 and θ₂₃=π/4. Flavor symmetry can require that the departures from these two equations are linearly related. T^' and A₄, which successfully accommodated the pre-T2K Pontecorvo-Maki-Nakagawa-Sakata matrix, predict that 38.07°≤θ₂₃≤39.52° at 95% C.L. The best fit values, combining the model predictions with T2K, MINOS, Double Chooz, Daya Bay, and RENO data, are θ₂₃=38.7° and θ₁₃=8.9°.