Fermion mass predictions in a generalized extended technicolor scenario.

Abstract

One family extended technicolor (ETC) models with technifermion mass spectra compatible with the experimental data for the precision parameters S, T, U, V, W, and X, and ETC interactions compatible with the CERN LEP measurements of the Z\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{} vertex have recently been proposed. To investigate whether these scenarios are consistent with the third family fermion masses we develop a generalized ETC model in which ETC interactions are represented by four-Fermi interactions. We discuss the reliability of the gap equation approximation to the nonperturbative dynamics. Two generic scenarios of couplings fit the precision data and third family masses: one is an unpredictive existence proof, the other, which generates the large top mass by direct top quark condensation, has a minimal number of interactions that break the global symmetry of the light fermions in the observed manner. This latter scenario makes surprisingly good predictions of the charm, strange, and up quark masses.