Testing technicolor models in top quark pair production at high energy photon colliders

Abstract

We study pseudo Goldstone boson corrections to $\ensuremath{\gamma}\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}t\overline{t}$ production rates in technicolor models with and without top-color at the $\sqrt{s}=0.5 \mathrm{and} 1.5$ 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 considerably larger than those in models without top-color, and they are all significantly larger than the corresponding corrections in the minimal supersymmetric standard model (MSSM) with $\mathrm{tan}\ensuremath{\beta}>~1$. Therefore, the two kinds of technicolor models and the MSSM with $\mathrm{tan}\ensuremath{\beta}>~1$ can be experimentally distinguished.