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Measurement of boldmath R = {mathcal{B}left(t rightarrow Wb right)/mathcal{B}left(t rightarrow Wq right)} in Top--Quark--Pair Decays using Dilepton Events and the Full CDF Run II Data Set
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arxiv 1404.3392 v1 pith:6LBOPJHS submitted 2014-04-13 hep-ex
Measurement of boldmath R = {mathcal{B}left(t rightarrow Wb right)/mathcal{B}left(t rightarrow Wq right)} in Top--Quark--Pair Decays using Dilepton Events and the Full CDF Run II Data Set
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We present a measurement of the ratio of the top-quark branching fractions $R=\mathcal{B}(t\rightarrow Wb)/\mathcal{B}(t\rightarrow $ $q$ represents quarks of flavors $b$, $s$, or $d$, in the final state, in events with two charged leptons, missing transverse energy and at least two jets. The measurement uses $\sqrt{s}$ = 1.96 TeV proton--antiproton collision data corresponding to an integrated luminosity of 8.7 fb$^{-1}$ and collected with the Collider Detector at Fermilab during Run II of the Tevatron. We measure $R=0.87 \pm 0.07$ (stat+syst), and extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, $\left|V_{tb}\right| = 0.93 \pm 0.04$ (stat+syst) assuming three generations of quarks. Under these assumptions, a lower limit of $|V_{tb}|>0.85$ at 95% credibility level is set.
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