CP violation in γγ → tt-bar within the minimal supersymmetric standard model

The complete analysis of CP violation in the process γγ → tt-bar in the framework of the minimal supersymmetric model is presented. The CP-odd observables for describing the CP violating effects in polarized and unpolarized photon collisions, are calculated. We investigate the possible CP violation sources induced by the complex soft breaking parameters and study the CP violating effects contributed by gluino, neutralino and chargino sectors appearing in the loop diagrams. We find that it is possible to observe CP violating effects in top-quark pair production via polarized and unpolarized photon fusions by using optimal observables and favourable parameters. (author)