Approximate flavor symmetries at a grand unification scale

Abstract

We study the evolution of fermion mass matrices considering the hypothesis of approximate flavor symmetries (AFS) in the Standard Model and a two-Higgs-doublet model. We find that the hierarchical structure is not significantly altered by the running, hence the assumption of AFS is entirely compatible with a grand unification scenario.

Comments: 9 pages RevTex, epsf, epsfig, 2 uuencoded figures. To appear in Modern Physics Letters A