CP VIOLATION IN T-]W(-HIGGS DOUBLET MODEL()B DECAYS IN 2)

Due to the large mass of top quark, CP violation in the top-quark deca y is sensitive to the interactions mediated by Higgs bosons. We consid er CP violation in t --> W(+)b decay by calculating consistently in un itary gauge the CP-violating up-down asymmetry of the leptons from W b oson decays in t --> W(+)b, defined by Grzadkowski and Gunion, in the two-Higgs doublet model with CP-violating neutral sector. The asymmetr y is shown to be at most of the order of (1 - 4) x 10(-3) for tan beta = 1.0, where tan beta is the ratio of vacuum expectation values for t he two neutral Higgs bosons.