THE DISCUSSION OF ELECTROWEAK PARAMETERS IN TECHNICOLOR MODELS WITH A SCALAR DOUBLET

Abstract

In technicolor models with a scalar doublet, we discuss the effect of the custodial isospin violation on the electroweak parameters S and T in one-loop perturbation theory. We find that the “high-energy” contributions to the parameter S could be reduced by the mass splitting of technifermions p and m. The leading contributions to the parameter T come from the technifermions p−m mass splitting and may exceed the experimental bounds. However, the value of parameter T can be reduced by adjusting the value of δ.