The process $e^{+}{e}^{-}\to \bar{t}c$ in topcolor-assisted technicolor models

Abstract

We consider the flavor changing neutral current(FCNC) process $e^{+}{e}^{-}\to \bar{t}c$(or $t\bar{c}$) in the context of topcolor-assisted technicolor(TC2) models. We find that the contributions of charged scalars (technipions and top-pions) and topcolor gauge bosons are negligibly small. The neutral scalars (top-pion ${\pi }_t^0$ and top-Higgs $h_t^0$) can give significant contributions to this process. With reasonable values of the parameters in TC2 models, there will be several tens of the observable $\bar{t}c$ events to be generated in the future $e^{+}{e}^{-}$ linear colliders.

Comments: Latex files, 15 pages and 6 figures