Inspired by the recent T2K indication of a relatively large theta_{ 13}, we provide a systematic study of some general modifications to three mostly discussed neutrino mixing patterns, i.e., tri-bimaximal, bimaximal and democratic mixing matrices. The correlation between theta_{ 13} and two large mixing angles are provided according to each modifications. The phenomenological predictions of theta_{ 12} and theta_{ 23} are also discussed. After the exclusion of several minimal modifications, we still have reasonable predictions of three mixing angles in 3 Sigma level for other scenarios.
Categories: hep-ph