Measurement of B(t->Wb)/B(t->Wq) at the Collider Detector at Fermilab

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Abstract
We present a measurement of the ratio of top-quark branching fractions R= B(t -> Wb)/B(t -> Wq) using lepton-plus-jets and dilepton data sets with integrated luminosity of ~162 pb^{-1} collected with the Collider Detector at Fermilab during Run II of the Tevatron. The measurement is derived from the relative numbers of t-tbar events with different multiplicity of identified secondary vertices. We set a lower limit of R > 0.61 at 95% confidence level.

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