Search for the top quark decaying to a charged Higgs boson inpp¯ collisions at √s=1.8 TeV

We present results of a search for the top quark decaying to a charged Higgs boson (${\mathit{H}}^{+}$) in p p¯ collisions at √s =1.8 TeV at the Fermilab Tevatron. Assuming that ${\mathit{H}}^{+}$→τ${\nu }_{\mathrm{\tau }}$ is the dominant ${\mathit{H}}^{+}$ decay mode, we exclude regions of the (${\mathit{m}}_{\mathit{H}}^{+}$,${\mathit{m}}_{\mathit{t}}$) plane for values of the branching ratio, B(${\mathit{H}}^{+}$→τ${\nu }_{\mathrm{\tau }}$)=0.5, 0.75, and 1.0. We interpret the results in terms of the parameter tan β in the two-Higgs-doublet model.