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We investigate the feasibility of probing anomalous top-quark couplings of$Wtb$, $Z t \bar{t}$, and $\gamma t \bar{t}$ in terms of an effectiveLagrangian with dimension-six operators at future $e^+e^-$ linear colliderswith a c. m. energy $\sqrt s \sim 500-800$ GeV. We first examine theconstraints on these anomalous couplings from the $Z\to b \bar{b}$ data at LEPI and from unitarity considerations. We then consider in detail the effects ofanomalous couplings on $t \bar{t}$ spin correlations in the top-pair productionand decay with three spin bases: the helicity, beamline and off-diagonal bases.Our results show that the polarized beams are more suitable for exploring theeffects of different new operators. For polarized beams, the helicity basisyields the best sensitivity.Comment: 23 pages, 10 figures, references adde

Top-quark spin correlation at linear colliders with anomalous couplings