Abstract
Possible anomalous top-quark couplings induced by SU(2)× U(1) gauge-invariant dimension-6 effective operators were studied in the process of t t ̄ productions and decays at polarized γγ colliders. Two CP-violating asymmetries, a linear-polarization asymmetry and a circular-polarization asymmetry, were computed including both non-standard t t ̄ γ and γγH couplings. An optimal-observable analysis for the process γγ→t t ̄ →l ±⋯ was performed in order to estimate the precision for determination of all relevant non-standard couplings, including the anomalous tbW coupling.
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