Search for the charged Higgs boson in the decays of top quark pairs in theeτandμτchannels ats=1.8TeV

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Abstract

Top quark production offers the unique opportunity to search for a charged Higgs boson ${(H}^{\ifmmode\pm\else\textpm\fi{}}),$ as the contribution from $\stackrel{\ensuremath{\rightarrow}}{t}{H}^{+}\stackrel{\ensuremath{\rightarrow}}{b}{\ensuremath{\tau}}^{+}\ensuremath{\nu}b$ can be large in extensions of the standard model. We use results from a search for top quark pair production by the Collider Detector at Fermilab (CDF) in the $e\ensuremath{\tau}+{E}_{T}+\mathrm{jets}$ and $\ensuremath{\mu}\ensuremath{\tau}+{E}_{T}+\mathrm{jets}$ signatures to set an upper limit on the branching ratio of $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{t}{H}^{+}b)$ in 106 ${\mathrm{pb}}^{\ensuremath{-}1}$ of data. The upper limit is in the range 0.5 to 0.6 at 95% C.L. for ${H}^{+}$ masses in the range 60 to 160 GeV, assuming the branching ratio for ${H}^{+}\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\nu}$ is 100%. The $\ensuremath{\tau}$ lepton is detected through its 1-prong and 3-prong hadronic decays.

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