The Unique Horizontal Symmetry of Leptons
Abstract
Description
There is a group-theoretical connection between fermion mixing matrices and minimal horizontal symmetry groups. Applying this connection to the tri-bimaximal neutrino mixing matrix, we show that the minimal horizontal symmetry group for leptons is uniquely $S_4$, the permutation group of four objects.
References added. To appear in Phys. Rev. D
References added. To appear in Phys. Rev. D