Towards a realistic composite model of quarks and leptons

Abstract

Within the context of the 't Hooft anomaly matching scheme, some guiding principles for model building are discussed with an eye to low-energy phenomenology. It is argued that Λch (chiral symmetry breaking scale of the global color-flavor group GCF) ≈ ΛMC (metacolor scale) and ΛgCF (unification scale of the gauge subgroup of GCF) ≲ Λch. As illustrations of the method, two composite models are suggested that can give rise to three or four generations of ordinary quarks and leptons without exotic fermions. © 1986.