The spin correlation in top quark production: QCD corrections vs   anomalous couplings
  We discuss top quark production and its subsequent decay at lepton colliders including both QCD corrections and anomalous gamma / Z - t t-bar couplings. The off-diagonal spin basis for the top and anti-top quarks is shown to be useful to probe the anomalous couplings. 
Y. Kiyo, J. Kodaira, K. Morii, T. Nasuno and S. Parke