Abstract
We consider a general two-Higgs-doublet model with CP violation in the scalar sector. Three neutral Higgs fields of the model all mix and the resulting physical Higgs bosons have no definite CP properties. That leads, at the one-loop level of the perturbation expansion, to CP-violating form factors for gamma-t-tbar, Z-t-tbar and W-t-b interaction vertices. We discuss asymmetries sensitive to CP violation induced by the form factors for the process e^+ e^- -> t tbar -> l^\pm ... and e^+ e^- -> t tbar -> b/bbar ... at future linear e+ e- colliders.
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