New-Physics Search through gamma gamma -> t tbar -> lX/bX
  We probe optimal beam polarizations for new-physics search in top-quark and Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators as anomalous top and Higgs couplings, we estimate expected statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX, using the optimal-observable method. 
Bohdan Grzadkowski (Warsaw U.), Zenro Hioki (U. Tokushima), Kazumasa   Ohkuma (Fukui U. Tech.), Jose Wudka (UC Riverside)