SINGLE CHARGED TOP-PION PRODUCTION AT THE LHeC IN γp COLLISION

In the context of the topcolor-assisted technicolor (TC2) model, we study the productions of the charged top-pion associated with single top, charm or bottom quark in gamma p collision, which proceed via the subprocesses b gamma -> t Pi(-)(t), b gamma -> c Pi(-)(t) and c gamma -> b Pi(+)(t). With the electron energy E-e = 50 GeV and photon energy E-p = 7 TeV, we find that the production rates can reach the level of several tens fb for t Pi(-)(t) production, and hundreds of fb for c Pi(-)(t) (or b Pi(+)(t)) productions. So one can expect that enough signals could be produced in the large part of the parameter space. Furthermore, these flavor-changing (FC) productions are extremely suppressed in the standard model (SM). With a large number of events and the clean background, the charged top-pion should be observable at the Large Hadron electron Collider (LHeC) based gamma p colliders. Thus, such charged top-pion production processes may offer a useful way to test the TC2 model.