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We present a search for charged Higgs bosons in top quark decays. We analyzethe \eplus, \muplus, $ee$, $e\mu$, $\mu\mu$, \etau and \mutau final states fromtop quark pair production events, using data from about 1${\text{fb}}^{-1}$ ofintegrated luminosity recorded by the \dzero experiment at the FermilabTevatron Collider. We consider different scenarios of possible charged Higgsboson decays, one where the charged Higgs boson decays purely hadronically intoa charm and a strange quark, another where it decays into a $\tau$ lepton and a$\tau$ neutrino and a third one where both decays appear. We extract limits onthe branching ratio $B(t\to H^+ b)$ for all these models. We use two methods,one where the $t\bar{t}$ production cross section is fixed, and one where thecross section is fitted simultaneously with $B(t\to H^+b)$. Based on theextracted limits, we exclude regions in the charged Higgs boson mass and $\tan\beta$ parameter space for different scenarios of the minimal supersymmetricstandard model.

Search for charged Higgs bosons in top quark decays