Charged Top-Pion Production at e⁺e^- and γγ Colliders

We study the charged top-pion in the topcolor assisted technicolor model(TC2), and calculate the production of charged top-pion at e⁺e^- and γγ colliders. At an e⁺e^- collider, charged top-pion can be produced via the processes e⁺e^- →tbπ_t^-(tbπt⁺).At a γγ collider, it can be produced via the processes γγ → tbπ_t^-(tbπt⁺). The cross section can reach to a few of fb depending on the mass of the charged top-pion.