Production and decay of the neutral top pion in high energye+e−colliders

Abstract

We study the production and decay of the neutral top-pion π 0 t predicted by topcolor-assisted technicolor(TC2) theory. Our results show that, except the dominant decay modes bb,tc and gg, the π 0 t can also decay into γγ and Zγ modes. It can be significantly produced at high energy e + e − collider(LC) experiments via the processes e + e − → π 0 t γ and e + e − → Zπ 0 t . We further calculate the production cross sections of the processes e + e − → γπ 0 t → γtc and e + e − → Zπ 0 t → Ztc. We find that the signatures of the neutral top-pion π 0 t can be detected via these processes.PACS number(s): 12.60Nz, 14.80.Mz

Associated production of the top-pions and single top at hadron colliders

“…For m t < m πt ≤ 2m t , π 0 t mainly decays to tc or tc. It has been shown that the value of the branching ratio Br(π 0 t → tc + tc) is larger than 90% for m πt = 250GeV and ε ≥ 0.02 [12]. Thus, for m t < m πt ≤ 2m t , the associated production of π 0 t with single top quark can easily transfer to the same sign top pair event ttc at LHC.…”

Study of the single neutral top pion production process atγγcollider

“…t b ÿ t and e e ÿ ! W ÿ t ; these processes have been systematically studied [9][10][11]. The photon colliders will offer another chance to search for the top pions.…”

Lepton flavor violating signals of the neutral top-pion in future lepton colliders

“…The total decay width which has been calculated in Ref. [21]. However, the modes of decay into leptons are not included in this reference.…”