Searching for Flavor-Changing Neutral-Current Signals via e+e- (γγ) → t(c)over-barht0 in Topcolor-Assisted Technicolor Model

In the context of the top-color-assisted technicolor (TC2) model, the flavor-changing neutral-current (FCNC) interaction induced by the top-higgs(h(t)(0)) are predicted at tree level. We study the relevant processes of e(+)e(-) (gamma gamma) -> t (c) over barh(t)(0) at the International Linear Collider(ILC). It is found that these rare processes production rates can be enhanced significantly in the TC2 model. Especially for the process gamma gamma -> t (c) over barh(t)(0), the total cross section will reach a few fb in the reasonable parameter space. We also calculate the distributions of transverse momenta, pseudo-rapid and invariant mass of the top-higgs. Inview of the main decay modes of top-higgs for m(ht0) < 2m(t), we find that there will be several hundreds FCNC events produced at the ILC with annually integral luminosity of 500 fb(-1). Due to the clean background, such FCNC signals can possibly be detected at the ILC.