Extracting the Top-Quark Width from Non-Resonant Production

Abstract

In the context of the Standard Model (SM) of particle physics, the relationship between the top-quark mass and width (${\Gamma }_t$) has been precisely calculated. However, the uncertainty from current direct measurements of the width is nearly 50%. A new approach for directly measuring the top-quark width using events away from the resonance peak is presented. By using an orthogonal dataset to traditional top-quark width extractions, this new method may enable significant improvements in the experimental sensitivity in a method combination. Recasting a recent ATLAS differential cross section measurement, we find ${\Gamma }_t$ = 1.28 $\pm$ 0.30 GeV (1.33 $\pm$ 0.29 GeV expected), providing the most precise direct measurement of the width.

arXiv comment7 pages, 2 figures

References in corpus (55)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Observation of Top Quark Production in Pbar-P Collisions
• Dispelling the N^3 myth for the Kt jet-finder
• Observation of the Top Quark
• Scattering Amplitudes with Open Loops
• Single-top hadroproduction in association with a W boson
• Rivet user manual
• Inadequacy of zero-width approximation for a light Higgs boson signal
• Measurements of properties of the Higgs boson decaying into the four-lepton final state in pp collisions at sqrt(s) = 13 TeV
• Constraining the Higgs boson width with ZZ production at the LHC
• Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
• NLO QCD corrections to WWbb production at hadron colliders
• Top-Quark Decay at Next-to-Next-to-Leading Order in QCD
• Bounding the Higgs width at the LHC using full analytic results for gg -> 2e 2μ
• Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs
• NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders
• Search for a charged Higgs boson in pp collisions at sqrt(s) = 8 TeV
• Mass Effects in the Higgs-Gluon Coupling: Boosted vs Off-Shell Production
• An NLO+PS generator for $t\bar{t}$ and $Wt$ production and decay including non-resonant and interference effects
• Search for charged Higgs bosons decaying via $H^{\pm }\to {\tau }^{\pm }{\nu }_{\tau }$ in the $\tau$+jets and $\tau$+lepton final states with 36 fb${}^{-1}$ of $pp$ collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS experiment
• tWH associated production at the LHC
• $O({\alpha }_s^2)$ corrections to fully-differential top quark decays
• Search for charged Higgs bosons decaying into top and bottom quarks at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Second Order QCD Corrections to $\Gamma (t\to Wb)$
• Limits on the Higgs boson lifetime and width from its decay to four charged leptons
• Limitations and Opportunities of Off-Shell Coupling Measurements
• An improved determination of the width of the top quark
• Two-loop QCD corrections to top quark width
• Taming the off-shell Higgs boson
• NLO QCD corrections to W+ W- b anti-b production with leptonic decays in the light of top quark mass and asymmetry measurements
• On the Treatment of Resonances in Next-to-Leading Order Calculations Matched to a Parton Shower
• Measurement of the ratio B(t to Wb)/B(t to Wq) in pp collisions at sqrt(s) = 8 TeV
• Constraints on off-shell Higgs boson production and the Higgs boson total width in $ZZ\to 4\ell$ and $ZZ\to 2\ell 2\nu$ final states with the ATLAS detector
• Bounding the Higgs width at the LHC: complementary results from $H\to WW$
• The top induced backgrounds to Higgs production in the WW -> llvv decay channel at NLO in QCD
• Finite-Width Effects in Top Quark Production at Hadron Colliders
• Beyond Geolocating: Constraining Higher Dimensional Operators in $H\to 4\ell$ with Off-Shell Production and More
• A unified NLO description of top-pair and associated Wt production
• Search for Higgs boson off-shell production in proton-proton collisions at 7 and 8 TeV and derivation of constraints on its total decay width
• Higgs couplings: disentangling New Physics with off-shell measurements
• Heavy-to-light decays with a two-loop accuracy
• NLO corrections to squark-squark production and decay at the LHC
• A Direct Measurement of the Total Decay Width of the Top Quark
• Off-shell Higgs Probe to Naturalness
• A theoretical study of top-mass measurements at the LHC using NLO+PS generators of increasing accuracy
• Probing the quantum interference between singly and doubly resonant top-quark production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Direct top-quark decay width measurement in the $t\bar{t}$ lepton+jets channel at $\sqrt{s}$=8 TeV with the ATLAS experiment
• Probing the top-quark width through ratios of resonance contributions of $e^{+}{e}^{-}\to W^{+}{W}^{-}b\bar{b}$
• Model independent top quark width measurement using a combination of resonant and non resonant cross sections
• Probing the top-quark width using the charge identification of $b$ jets

Cited by in corpus (6)

• Analytic three-loop QCD corrections to top-quark and semileptonic $b\to u$ decays
• Analytic result for the top-quark width at next-to-next-to-leading order in QCD
• QCD improved top-quark decay at next-to-next-to-leading order
• The Linear Template Fit
• The ALPs from the Top: Searching for long lived axion-like particles from exotic top decays
• Summary of Working Group 5: Physics with Heavy Flavours