Derivation of the Wolfenstein form of the Kobayashi-Maskawa matrix from fermion masses.

Abstract

We use an empirical, perturbative approach to the fermion mass matrix to derive the Wolfenstein form of the KM matrix as a power series in the Cabibbo angle parameter λ=sinθC. With the aid of an SU(3) family symmetry, we extend the theory to neutrinos and we make predictions about their Dirac masses and mixing angles.