Abstract
Effect of the top quark electric dipole coupling and the Zγγ coupling is studied in the pair production of top quark at a photon collider using CP-violating asymmetries. Our results show that with a photon collider of geometrical luminosity of 20 fb −1 it is possible to put limits of the order of 0.1 on the Zγγ coupling and about 2.5×10 −17 e cm on the top quark electric dipole coupling using these asymmetries.
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