CP-violating Z-gamma-gamma and top-quark electric dipole couplings in gamma gamma -> t bart
Abstract
An effective anomalous CP-violating Z-gamma-gamma coupling can give rise to observable CP-odd effects in gamma gamma -> t bart. We study certain asymmetries in the decay lepton distributions in gamma gamma -> t bart arising from top decay in the presence of a CP-violating Z-gamma-gamma coupling as well as a top-quark electric dipole coupling. We find that a photon linear collider with geometric luminosity of 20 fb-1 can put limits of the order of 0.1 on the imaginary part of the CP-violating anomalous Z-gamma-gamma coupling using these asymmetries.
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