Searching for Flavor-Changing Neutral-Current Signals via e+e− (γγ) → tc̄h0t in Topcolor-Assisted Technicolor Model

Abstract

In the context of the top-color-assisted technicolor (TC2) model, the flavor-changing neutral-current (FCNC) interaction induced by the top-higgs (h0t) are predicted at tree level. We study the relevant processes of e+e− (γγ) → tc̄h0t at the International Linear Collider (ILC). It is found that these rare processes production rates can he enhanced significantly in the TC2 model. Especially for the process γγ → tc̄h0t, 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. In view of the main decay modes of top-higgs for mh0t < 2mt, 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.