Radiative corrections and explicit perturbations to the tetra-maximal neutrino mixing with large θ13

The tetra-maximal neutrino mixing pattern predicts a relatively large reactor mixing angle θ13≈8.4°, which is in good agreement with the latest best-fit value θ13=9°. However, its prediction for θ12≈30.4° is inconsistent with current oscillation data at the 3σ C.L. We show that explicit perturbations to the tetra-maximal mixing can naturally enhance θ12 to its best-fit value θ12=34°. Furthermore, we demonstrate that if the tetra-maximal mixing is produced by a certain flavor symmetry at a high-energy scale Λ=1014GeV, significant radiative corrections in the minimal supersymmetric standard model can modify θ12 to be compatible with experimental data at the electroweak scale ΛEW=102GeV. The predictions for θ13≈8.4° and θ23=45°, as well as the CP-violating phases ρ=σ=−δ=90°, are rather stable against radiative corrections.