An improved determination of the width of the top quark

Abstract

We present an improved determination of the total width of the top quark, ${\Gamma }_t$, using 5.4 fb${}^{-1}$ of integrated luminosity collected by the D0 Collaboration at the Tevatron $p\bar{p}$ Collider. The total width ${\Gamma }_t$ is extracted from the partial decay width $\Gamma (t\to Wb)$ and the branching fraction $\mathcal{B}(t\to Wb)$. $\Gamma (t\to Wb)$ is obtained from the $t$-channel single top quark production cross section and $\mathcal{B}(t\to Wb)$ is measured in $t\bar{t}$ events. For a top mass of $172.5\mathrm{GeV}$, the resulting width is ${\Gamma }_t=2.00_{-0.43}^{+0.47}$ GeV. This translates to a top-quark lifetime of ${\tau }_t=(3.29_{-0.63}^{+0.90})\times 10^{-25}$ s. We also extract an improved direct limit on the CKM matrix element $0.81<|V_{tb}|\le 1$ at 95% C.L. and a limit of $|V_{t{b}^{\prime }}|<0.59$ for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.

8 pages, 4 figures, submitted to Phys. Rev. D (RC)

References in corpus (3)

• Single top quark production at the Tevatron: threshold resummation and finite-order soft gluon corrections
• Simultaneous measurement of the ratio B(t->Wb)/B(t->Wq) and the top quark pair production cross section with the D0 detector at sqrt(s)=1.96 TeV
• Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production

Cited by in corpus (51)

• The Standard Model as an Effective Field Theory
• Combination of the top-quark mass measurements from the Tevatron collider
• Constraining top quark effective theory in the LHC Run II era
• Combination of measurements of the top-quark pair production cross section from the Tevatron Collider
• Quark Seesaw, Vectorlike Fermions and Diphoton Excess
• Measurements of t t-bar spin correlations and top-quark polarization using dilepton final states in pp collisions at sqrt(s) = 7 TeV
• Measurement of the ratio B(t to Wb)/B(t to Wq) in pp collisions at sqrt(s) = 8 TeV
• Measurements of spin correlation in top-antitop quark events from proton-proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• Discerning New Physics in Top-Antitop Production using Top Spin Observables at Hadron Colliders
• Measurements of t t-bar spin correlations and top quark polarization using dilepton final states in pp collisions at sqrt(s) = 8 TeV
• Top Quark Physics at the LHC: A Review of the First Two Years
• Minimal Dilaton Model
• Dark Mesons at the LHC
• Combined search for the quarks of a sequential fourth generation
• Flavor Cosmology: Dynamical Yukawas in the Froggatt-Nielsen Mechanism
• Lorentz and CPT Violation in Top-Quark Production and Decay
• A Direct Measurement of the Total Decay Width of the Top Quark
• Techniques for the treatment of IR divergences in decay processes at NLO and application to the top-quark decay
• Measurements of top quark spin observables in $t\bar{t}$ events using dilepton final states in $\sqrt{s}=8$ TeV $pp$ collisions with the ATLAS detector
• Single top-quark production at the Tevatron and the LHC
• Lepton Flavour Violating top decays at the LHC
• Top-Quark Physics: Status and Prospects
• Direct top-quark decay width measurement in the $t\bar{t}$ lepton+jets channel at $\sqrt{s}$=8 TeV with the ATLAS experiment
• Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• B decay anomalies in an effective theory
• Anomalous Top Couplings at Hadron Colliders Revisited
• Hadron energy spectrum in polarized top quark decays considering the effects of hadron and bottom quark masses
• Top physics at the LHC
• The Top Quark
• Model-independent extraction of $|V_{tq}|$ matrix elements from top-quark measurements at hadron colliders
• Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry
• Measurement of spin correlation between top and antitop quarks produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Extracting the Top-Quark Width from Non-Resonant Production
• Measurement of the Top Quark Mass Using the Matrix Element Technique in Dilepton Final States
• Top Quark Forward-Backward Asymmetry and Anomalous Right-Handed Charge Currents
• Model independent top quark width measurement using a combination of resonant and non resonant cross sections
• Electroweak Top Couplings, Partial Compositeness and Top Partner Searches
• Signatures of top flavour-changing dark matter
• Search for New Physics in Rare Top Decays: $t\bar{t}$ Spin Correlations and Other Observables
• Properties of the Top Quark
• Top Quark Physics at the Tevatron
• Detecting New Physics in Rare Top Decays at the LHC
• Determining Top Quark Couplings at the LHC: Snowmass White Paper
• Measuring CP-Violating Observables in Rare Top Decays at the LHC
• Measurements of top-quark properties at the Tevatron
• Top quark physics in the Large Hadron Collider era
• New physics in top decay
• Measurements of Top Quark Properties at the Tevatron
• Searches for new physics in top decays at the LHC
• Novel and Updated Bounds on Flavor-Violating Z Interactions in the Quark Sector
• Heavy Flavour Working Group Summary