CP-odd Neutral Higgs Effects in Top -- anti-Top Production

Abstract

We study $CP$ violation in the process $e^{+}{e}^{-}\to t\bar{t}\nu \bar{\nu }$ at an $e^{+}{e}^{-}$-TeV collider. As the source of $CP$ violation we assume a two-Higgs doublet model with an explicitly $CP$-noninvariant Higgs potential. Sizeable $CP$-odd observables originating from the subprocess reaction, $W^{+}{W}^{-}\to t\bar{t}$, may arise as a result of finite width effects of the neutral Higgs particles. $CPT$ constraints due to final (initial) state interactions are also taken into account. Numerical estimates of the $CP$ asymmetry are given.

Comments: 28 pages(2 Figs not included), LaTeX, MZ-TH/92-56