TESTING TECHNICOLOR MODELS IN TOP-QUARK PAIR PRODUCTION AT HIGH-ENERGY PHOTON COLLIDERS

We study pseudo Goldstone boson corrections to gamma gamma-->t (t) ove r bar production rates in technicolor models with and without top-colo r at the root s = 0.5 and 1.5 TeV photon colliders. We find that, for reasonable ranges of the parameters, the corrections are large enough to be observable, and the corrections in models with top-color are con siderably larger than those in models without top-color, and they are all significantly larger than the corresponding corrections in the min imal supersymmetric standard model (MSSM) with beta greater than or eq ual to 1. Therefore, the two kinds of technicolor models and the MSSM with beta greater than or equal to 1 can be experimentally distinguish ed.[S0556-2821(98)02605-8].