Finite modular groups and lepton mixing Original Research Article

We study lepton mixing patterns which are derived from finite modular groups image, requiring subgroups image and image to be preserved in the neutrino and charged lepton sectors, respectively. We show that only six groups image with image, 4, 5, 7, 8, 16 are relevant. A comprehensive analysis is presented for image arbitrary and image, as demanded if neutrinos are Majorana particles. We discuss interesting patterns arising from both groups image and image being arbitrary. Several of the most promising patterns are specific deviations from tri-bimaximal mixing, all predicting image non-zero as favoured by the latest experimental data. We also comment on prospects to extend this idea to the quark sector.