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 $π_{t}^{0}$ 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 $π_{t}^{0}$ can also decay into $γγ$ and $Z γ$ modes. It can be significantly produced at high energy $e^{+}e^{-}$ collider(LC) experiments via the processes $e^{+}e^{-}\to π_{t}^{0}γ$ and $e^{+}e^{-}\to Zπ_{t}^{0}$. We further calculate the production cross sections of the processes $e^{+}e^{-}\toγπ_{t}^{0}\toγ\bar{t}c$ and $e^{+}e^{-}\to Zπ_{t}^{0}\to Z\bar{t}c$. We find that the signatures of the neutral top-pion $π_{t}^{0}$ can be detected via these processes.