Composite-technicolor standard model

Abstract

We characterize a class of composite models in which the quarks and leptons and technifermions are built from fermions (preons) bound by strong gauge interactions. We argue that if the preon dynamics has as [SU(3) × U(1)] 5 flavor symmetry that is explicitly broken only by preon mass terms proportional to the quark and lepton mass matrices, then the composite-tech-nicolor theory has a GIM mechanism that suppresses dangerous flavor changing neutral current effects. We show that the compositeness scale must be between ≈1 TeV and ≈2.5 TeV, giving rise to observable deviations from the standard electroweak interactions, and that B B mixing and CP violation in K mesons can differ significantly from the standard model predictions. The lepton flavor symmetries may be observable in the near future in the comparison of the compositeness effects in e +e − → μ +μ − with those in e +e − → e +e −.