Flavor-Changing Neutral-Current Production of t(c)over-bar 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 (c) over barh(t)(0) at the Large Hadron Collider (LHC), which proceeds through the parton-level processes gg -> t (c) over barh(t)(0), u (u) over bar -> t (c) over barh(t)(0), d (d) over bar -> t (c) over barh(t)(0). 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 (c) over barh(t)(0) 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.