HIGHER-DIMENSIONAL OPERATORS IN TOP-QUARK CONDENSATION FROM A RENORMALIZATION-GROUP POINT-OF-VIEW - ART. NO. 035009

The predictive power of top quark condensation models strongly depends on the behavior of higher dimensional operators. These are analyzed i n this paper by an extension of the standard renormalization group (RG ) arguments, which turns out to be a surprisingly powerful tool. Top q uark condensation models intermediated by underlying scalar exchange c an be shown to be mere reparametrizations of the standard model. Furth er on, RG arguments show that dynamical vector states cannot be lowere d in top quark condensation models. Finally, we give a general argumen t concerning the size of higher dimensional operators of heavy vector exchange. [S0556-2821(98)05515-5].