Measurement of R = \boldmath$\mathcal{B}(t\to Wb)/\mathcal{B}(t\to Wq)$ in Top--quark--pair Decays using Lepton+jets Events and the Full CDF Run II Data set

Abstract

We present a measurement of the ratio of the top-quark branching fractions $R=\mathcal{B}(t\to Wb)/\mathcal{B}(t\to Wq)$, where $q$ represents quarks of type $b$, $s$, or $d$, in the final state with a lepton and hadronic jets. The measurement uses $\sqrt{s}$ = 1.96 TeV proton--antiproton collision data from 8.7 fb${}^{-1}$ of integrated luminosity collected with the Collider Detector at Fermilab during Run II of the Tevatron. We simultaneously measure $R=0.94\pm 0.09$ (stat+syst), the $t\bar{t}$ production cross section ${\sigma }_{t\bar{t}}=7.5\pm 1.0$ (stat+syst) pb. The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, $|V_{tb}|=0.97\pm 0.05$ (stat+syst) is extracted assuming three generations of quarks, and a lower limit of $|V_{tb}|>0.89$ at 95% credibility level is set.

8 pages, 3 figures, submitted to PRL

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Cited by in corpus (10)

• Measurement of the ratio B(t to Wb)/B(t to Wq) in pp collisions at sqrt(s) = 8 TeV
• Single top-quark production at the Tevatron and the LHC
• Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The Top Quark
• Measurement of \boldmath $R=\mathcal{B}\left(t\to Wb\right)/\mathcal{B}\left(t\to Wq\right)$ in Top--Quark--Pair Decays using Dilepton Events and the Full CDF Run II Data Set
• Limits on the anomalous $Wtq$ couplings
• Properties of the Top Quark
• Scalar Spin of Elementary Fermions
• Experimental Status of the CKM Matrix
• Recent Top Properties Measurements at CDF