Probing anomalous top quark couplings at the future linear colliders

In terms of an effective Lagrangian we investigate the possibilities of probing anomalous top quark couplings, tt-barH, γtt-bar, Ztt-bar and tWb at the future linear colliders. It is found that at a linear collider with a c. m. energy √s ∼ 0.5 - 1.5 TeV and a high luminosity of 10 - 1000 fb-1, e+e- → tt-barH is an ideal process in probing anomalous tt-barH couplings. We also study in detail the effects of anomalous couplings on tt-bar spin correlations in the top pair production as well as the top quark decay processes with three bases (helicity, beam line and off-diagonal bases). Our results show that with a c. m. energy √s ∼ 0.5 - 1 TeV and a high luminosity of 1 - 100 fb-1, the anomalous couplings γtt-bar, Ztt-bar and tWb may be sensitively probed. (author)