Production and decay of the neutral top-pion in high energy $e^{+}{e}^{-}$ colliders

Abstract

We study the production and decay of the neutral top-pion ${\pi }_t^0$ predicted by topcolor-assisted technicolor(TC2) theory. Our results show that, except the dominant decay modes $b\bar{b}$, $\bar{t}c$ and $gg$, the ${\pi }_t^0$ can also decay into $\gamma \gamma$ and $Z\gamma$ modes. It can be significantly produced at high energy $e^{+}{e}^{-}$ collider(LC) experiments via the processes $e^{+}{e}^{-}\to {\pi }_t^0\gamma$ and $e^{+}{e}^{-}\to Z{\pi }_t^0$. We further calculate the production cross sections of the processes $e^{+}{e}^{-}\to \gamma {\pi }_t^0\to \gamma \bar{t}c$ and $e^{+}{e}^{-}\to Z{\pi }_t^0\to Z\bar{t}c$. We find that the signatures of the neutral top-pion ${\pi }_t^0$ can be detected via these processes.

Comments: Latex file, 13 Pages, 6 eps figures. to be published in Phys.Rev.D