Direct Search for Charged Higgs Bosons in Decays of Top Quarks

Abstract
We present a search for charged Higgs bosons in decays of pair-produced top quarks in pp¯ collisions at s=1.8TeV recorded by the D0 detector at the Fermilab Tevatron collider. With no evidence for signal, we exclude most regions of the ( MH±,tanβ) parameter space where the decay tH+b has a branching fraction >0.36 and B(H±τντ) is large.