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 Λ ch (chiral symmetry breaking scale of the global color-flavor group G CF) ≈ Λ MC (metacolor scale) and Λ gCF (unification scale of the gauge subgroup of G CF) ≲ Λ ch. 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.
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