Top Pair Production in e^+ e^- and gamma gamma Processes
  We analyze spin correlations between top quark and anti-top quark produced at polarized e^+ e^- and gamma gamma colliders. We consider a generic spin basis to find a strong spin correlation. Optimal spin decompositions for top quark pair are presented for e^+ e^- and gamma gamma colliders. We show the cross-section in these bases and discuss the characteristics of results. 
Michihiro Hori (Hiroshima Univ.), Yuichiro Kiyo (Hiroshima Univ.),   Jiro Kodaira (Hiroshima Univ.), Takashi Nasuno (Hiroshi...