[Formula presented] violation in top-quark pair production at a Next Linear Collider

We provide a detailed, model-independent study for [Formula presented]-violation effects due to the [Formula presented]-odd top-quark electric dipole moment (EDM) and weak dipole moment (WDM) in top-quark pair production via [Formula presented] and two-photon annihilation at a Next [Formula presented] Linear Collider (NLC). There are two methods in detecting [Formula presented]-violation effects in these processes. One method makes use of measurements of various spin correlations in the final decay products of the produced top-quark pair, while the other is to measure various [Formula presented]-odd polarization asymmetry effects of the initial states. In the [Formula presented] case only the first method can be used and in the [Formula presented] case both methods can be employed. We provide a complete classification of angular correlations of the [Formula presented] and [Formula presented] decay products under [Formula presented] and [Formula presented], which greatly faciliate [Formula presented] tests in the [Formula presented] mode. Concentrating on the second method with the Compton backscattered high-energetic laser light off the electron or positron beam in the two-photon mode, we construct two [Formula presented]-odd and [Formula presented]-even initial polarization configurations and apply them to investigating [Formula presented]-violating effects due to the top-quark EDM. With a typical set of experimental parameters at the NLC, we compare the [Formula presented] sensitivities to the top-quark EDM and WDM in the [Formula presented] mode and the two-photon mode. Some model expectation values of the [Formula presented]-odd parameters are compared with the results.