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We present an analysis of top-antitop quark production and decay into a taulepton, tau neutrino, and bottom quark using data from $9 {\rm fb}^{-1}$ ofintegrated luminosity at the Collider Detector at Fermilab.  Dilepton events, where one lepton is an energetic electron or muon and theother a hadronically-decaying tau lepton, originating from proton-antiprotoncollisions at $\sqrt{s} = 1.96 TeV$ are used. A top-antitop quark productioncross section of $8.1 \pm 2.1 {\rm pb}$ is measured, assuming standard-modeltop-quark decays. By separately identifying for the first time the single-tauand the ditau components, we measure the branching fraction of the top quarkinto tau lepton, tau neutrino, and bottom quark to be $(9.6 \pm 2.8) %$. Thebranching fraction of top-quark decays into a charged Higgs boson and a bottomquark, which would imply violation of lepton universality, is limited to beless than $5.9%$ at $95%$ confidence level.

Study of Top-Quark Production and Decays involving a Tau Lepton at CDF and Limits on a Charged-Higgs Boson Contribution