The flavor-changing rare top decays t -> cVV in topcolor-assisted technicolor theory

In the framework of topcolor-assisted technicolor (TC2) theory, we calculat e the contributions of the scalers (the neutral top-pion pi (0)(t) and the top-Higgs h(t)(0)) to the flavor-changing rare top decays t --> cVV (V = W, g, gamma or Z). Our results show that h(t)(0) can enhance the standard mod el B-r(SM)(t --> cWW) by several orders of magnitude for most of the parame ter space. The peak of the branching ratio resonance emerges when the top-H iggs mass is between 2m(W) and m(t). The branching ratio B-r (t --> cWW) ca n reach 10(-3) in the narrow range. (C) 2001 Elsevier Science B.V. All righ ts reserved.