SU(5)-COMPATIBLE YUKAWAON MODEL

Abstract

It is investigated what constraints are imposed on the so-called yukawaon model when we regard quarks and leptons as [Formula: see text] of SU(5) (i = 1, 2, 3: index of U(3) family symmetry). In past yukawaon models, the effective Yukawa coupling constants [Formula: see text] are given by vacuum expectation values of fields Yf ("yukawaons") as [Formula: see text]. In order to build a model without a cutoff scale Λ, vector-like fields [Formula: see text] are introduced in addition to the conventional quarks and leptons. The U(3) family symmetry is broken at 〈Yf〉~1013 GeV .