Abstract
Three-body top quark decays {ital t}{r_arrow}{ital H}{sup +}{ital b}({ital Z},{gamma},{ital g}) and {ital t}{r_arrow}{ital H}{sup +}{ital bH}{sup {ital i}} are calculated in two-Higgs-doublet models. We find that the branching ratio of the decay {ital t}{r_arrow}{ital H}{sup +}{ital b}({ital Z},{ital H}{sup {ital i}}) can reach the 10{sup {minus}4}--10{sup {minus}5} level for favorable parameter values and our calculations confirm the previous results given by another group for the channel {ital t}{r_arrow}{ital H}{sup +}{ital b}({ital g},{gamma}). Also, we discuss the feasibility of observing these top quark decays at future high energy colliders.
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