Possible flavor mixing structures of lepton mass matrices - art. no. 113016

To search for possible textures of lepton mass matrices, we systematically examine flavor mixing structures which can lead to large lepton mixing angl es. We find out 37 mixing patterns are consistent with experimental data, t aking into account phase factors in the mixing matrices. Only-six of the pa tterns can explain the observed data without any tuning of parameters, whil e the others need particular choices for the phase values. It is found that these six mixing patterns are those predicted by the models which have bee n proposed to account for fermion mass hierarchies. On the other hand, the others may give new flavor mixing structures of lepton mass matrices and th erefore new possibilities of model construction.