Top-Charm Associated Production at High Energy e^+e^- Colliders in Standard Model

Abstract

The flavor changing neutral current tcV (V=\gamma,Z) couplings in the production vertex for the process $e^{+}{e}^{-}\to t\bar{c}$ or $\bar{t}c$ in the standard model are investigated. The precise calculations keeping all quark masses non-zero are carried out. The total production cross section is found to be $1.84\times 10^{-9}$ fb at $\sqrt{s}=200GeV$ and $0.572\times 10^{-9}$ fb at $\sqrt{s}=500GeV$ respectively. The result is much smaller than that given in ref. \cite{clwy} by a factor of $10^{-5}$.

Comments: 12 pages including 1 ps figure and 2 eps figures