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

References in corpus (23)

• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• High-Energy-Physics Event Generation with PYTHIA 6.1
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Measurement of the J/Psi Meson and b-Hadron Production Cross Sections in ppbar Collisions at sqrt s = 1960 GeV
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• Determination of the Jet Energy Scale at the Collider Detector at Fermilab
• Observation of Bs-Bsbar Oscillations
• Observation of Single Top-Quark Production
• Measuring the running top-quark mass
• Updated predictions for the total production cross sections of top and of heavier quark pairs at the Tevatron and at the LHC
• Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt{s}=1.96 TeV using Lepton + Jets Events with Secondary Vertex b-tagging
• Direct Limits on the Bs Oscillation Frequency
• The theoretical top quark cross section at the Tevatron and the LHC
• Measurement of the single-top-quark t-channel cross section in pp collisions at sqrt(s) = 7 TeV
• Measurement of the t-channel single top-quark production cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Evidence for associated production of a single top quark and W boson in pp collisions at sqrt(s) = 7 TeV
• Determination of the pole and MSbar masses of the top quark from the ttbar cross section
• Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays
• Measurement of B(t->Wb)/B(t->Wq) at the Collider Detector at Fermilab
• Precision measurement of the ratio B(t -> Wb)/B(t -> Wq)
• Track Extrapolation and Distribution for the CDF-II Trigger System
• Search for Standard Model Higgs Boson Production in Association with a W Boson Using a Matrix Element Technique at CDF in p-bar{p} Collisions at sqrt{s} = 1.96 TeV
• Search for the standard model Higgs boson produced in association with a $W^{\pm }$ boson with 7.5 fb${}^{-1}$ integrated luminosity at CDF

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• 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