CP-violating Z-gamma-gamma and top-quark electric dipole couplings in gamma gamma -> t bar{t}

Abstract

An effective anomalous CP-violating Z-gamma-gamma coupling can give rise to observable CP-odd effects in gamma gamma -> t bar{t}. We study certain asymmetries in the decay lepton distributions in gamma gamma -> t bar{t} 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.

10 pages, latex, two figures included, Version accepted for publication in PLB

References in corpus (2)

• Electric dipole moment of top quark and CP-violating asymmetries in gamma gamma -> t tbar
• Measurement of triple gauge boson couplings from W^+W^- production at sqrt{s} = 172 GeV

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