CP Nonconservation in Top Quark Production by (Un) Polarized $e^+e^-$ and $γγ$ Collisions

Abstract

We report on an investigation of CP violation in (un)polarized $e^+e^-\to{\bar t}t$ resulting from an extended neutral Higgs sector or from the minimal SUSY extension of the Standard Model (SM). We consider c.m. energies from the ${\bar t}t$ threshold to the TeV range. In addition sensitivity estimates for CP-violating form factors of the top quark are made. Further we discuss the prospects of probing Higgs sector CP violationin $γγ\to{\bar t}t$.

8 pages, LaTeX; 3 postscript figures, epsf macro included; Contribution to the Workshop on $e^+e^-$ Linear Colliders; Annecy, Assergi, Hamburg, Febr. - Sept. 1995