Flavor-Changing Neutral-Current Production of t^-c in Association with a Neutral Top-Higgs at LHC in the Topcolor-Assisted Technicolor Model

In the framework of the topcolor-assisted technicolor (TC2) model we investigate the flavor-changing neutral-current production pp→ t^-ch_to at the Large Hadron Collider (LHC), which proceeds through the parton-level processes gg→ t^-ch_to , uu→ t^-ch_to and d^-d → t^-ch_to . We calculate the production rate and present the distributions of the transverse momenta and the invarient mass of the neutral top-higgs. It is found that the cross section of pp→ t^-ch_to can reach a few hundreds of fb in a large part of the allowed parameter space. Considering the main decay mode of top-higgs for m_ht<2m_t, we find that such a production may provide copious events. In the case of unobservation, the LHC can set meaningful constraints on the TC2 model.