Are technicolor models compatible with a very heavy top quark?

Abstract

We consider the phenomenological constraints on technicolor and extended technicolor (ETC) interactions required to give a realistic quark-lepton spectrum consistent with limits on flavor-changing neutral currents. Treating ETC interactions as higher-dimensional vertices in an effective-field theory of technicolor, we outline a phenomenologically acceptable technicolor model with a walking SU2 technicolor and a single generation of technifermions. Without fine-tuning or violating known constraints, we argue that both the strange-quark mass and a top-quark mass on the order of 100 GeV can be plausibly accommodated However, the precise ETC group and the dynamical mechanism responsible for its breaking are not determined.