Optimal-Observable Analysis of the Angular and Energy Distributions for   Top-Quark Decay Products at Polarized Linear Colliders
  An optimal-observable analysis of the angular and energy distributions of the leptons and bottom quarks in the process e+e- --> tt-bar --> l^{+-}/b(b-bar)... has been performed in order to measure the most general top-quark couplings to gauge bosons at polarized linear colliders. The optimal beam polarization for determination of each coupling has been found. A very sensitive test of CP violation in tt-bar production and decay has been proposed. 
Bohdan Grzadkowski and Zenro Hioki