Detecting top-Higgs at high energy $e^{+}{e}^{-}$ colliders

Abstract

We calculate the contributions of the top-Higgs $h_t^0$ predicted by topcolor assisted technicolor(TC2) models to $e^{+}{e}^{-}⟶\overline{t}c{\overline{\nu }}_e{\nu }_e$ and compare the results with the contributions of $h_t^0$ to the processes $e^{+}{e}^{-}⟶Z{h}_t^0⟶Z\overline{t}c$ and $e^{+}{e}^{-}⟶\gamma h_t^0⟶\gamma \overline{t}c$. We find that $e^{+}{e}^{-}⟶\overline{t}c{\overline{\nu }}_e{\nu }_e$ is very sensitive to $h_t^0$, which can be easy detected via this process at high-energy $e^{+}{e}^{-}$ collider(LC) experiments with $\sqrt{s}\ge 500$ $GeV$, as long as its mass below the $\overline{t}t$ threshold. The process $e^{+}{e}^{-}⟶\gamma \overline{t}c$ also can be used to detect $h_t^0$ at LC experiments.

Comments: latex file, 10 pages, 4 eps figure, submitted to Phys. Lett. B