CP VIOLATION IN H-]T(T)OVER-BAR DECAYS AT E- COLLIDERS(E)

A helicity asymmetry for top quarks originating from Higgs boson decay s is investigated within the 2-Higgs Doublet Model. The asymmetry is s ensitive to CP violation in the scalar sector of the model, whereas it vanishes in the Standard Model. It has been checked that without any fine tuning of parameters the asymmetry can reach 70%. Standard decay patterns t --> W+b and tBAR --> W- bBAR are utilized as spin analyzers to measure the asymmetry. The Higgs production mechanism considered h ere is e+e --> Z --> HZ. It has been shown that signal from the asymm etry can easy overcome the noise for Higgs bosons produced in future l inear e+e colliders at energy square-root s = 500 GeV operating with i ntegrated luminosity L = 8.5 x 10(4) pb-1 yr-1.