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We present a measurement of the ratio of top-quark branching fractions R= B(t-> Wb)/B(t -> Wq), where q can be a b, s or a d quark, using lepton-plus-jetsand dilepton data sets with integrated luminosity of ~162 pb^{-1} collectedwith the Collider Detector at Fermilab during Run II of the Tevatron. Themeasurement is derived from the relative numbers of t-tbar events withdifferent multiplicity of identified secondary vertices. We set a lower limitof R > 0.61 at 95% confidence level.Comment: 7 pages, 2 figures, published in Physical Review Letters; changes  made to be consistent with published versio

physical review letters

Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">B</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>t</mml:mi><mml:mo>→</mml:mo><mml:mi>W</mml:mi><mml:mi>b</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo>/</mml:mo><mml:mi mathvariant="script">B</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>t</mml:mi><mml:mo>→</mml:mo><mml:mi>W</mml:mi><mml:mi>q</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>at the Collider …

Measurement ofB(t→Wb)/B(t→Wq)at the Collider …