Measurement of single top-quark production in association with a $W$ boson in the single-lepton channel at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract

The production cross-section of a top quark in association with a $W$ boson is measured using proton-proton collisions at $\sqrt{s}=8$ TeV. The dataset corresponds to an integrated luminosity of 20.2 fb${}^{-1}$, and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the $tW$ signal from the dominant $t\bar{t}$ background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying $W$ boson. The measured cross-section is ${\sigma }_{tW}=26\pm 7$ pb, in good agreement with the Standard Model expectation.

arXiv comment42 pages in total, author list starting page 26, 8 figures, 3 tables, published in Eur. Phys. J C 81 (2021) 720. All figures including auxiliary figures are available at : http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2016-06

References in corpus (65)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Parton distributions for the LHC
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• Parton distributions with LHC data
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Matching NLO QCD computations and parton shower simulations
• The ATLAS Simulation Infrastructure
• Implications of CTEQ global analysis for collider observables
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• An update on vector boson pair production at hadron colliders
• Tuning Monte Carlo Generators: The Perugia Tunes
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• QCD matrix elements and truncated showers
• Single-top hadroproduction in association with a W boson
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production
• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• The CT10 NNLO Global Analysis of QCD
• Multiparton Interactions in Photoproduction at HERA
• NNLL resummation for s-channel single top quark production
• Performance of pile-up mitigation techniques for jets in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Luminosity determination in pp collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector at the LHC
• Performance of $b$-Jet Identification in the ATLAS Experiment
• Electron performance measurements with the ATLAS detector using the 2010 LHC proton-proton collision data
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Performance of the ATLAS Trigger System in 2010
• Single Top Production as a Window to Physics Beyond the Standard Model
• NLO matrix elements and truncated showers
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• Electron efficiency measurements with the ATLAS detector using 2012 LHC proton-proton collision data
• Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO
• The RooStats Project
• Observation of the associated production of a single top quark and a W boson in pp collisions at sqrt(s) = 8 TeV
• Evidence for the associated production of a W boson and a top quark in ATLAS at sqrt(s) = 7 TeV
• Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC
• Evidence for associated production of a single top quark and W boson in pp collisions at sqrt(s) = 7 TeV
• Search for New Physics via Single Top Production at the LHC
• Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb${}^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collision data with the ATLAS detector
• Isolating Wt production at the LHC
• The impact of PDF and alphas uncertainties on Higgs Production in gluon fusion at hadron colliders
• Performance of the ATLAS muon trigger in pp collisions at $\sqrt{s}=8$ TeV
• A Neural Bayesian Estimator for Conditional Probability Densities
• Performance of algorithms that reconstruct missing transverse momentum in $\sqrt{s}=$ 8 TeV proton-proton collisions in the ATLAS detector
• Measurement of the production cross-section of a single top quark in association with a $W$ boson at 8 TeV with the ATLAS experiment
• Measurement of the cross-section for producing a $W$ boson in association with a single top quark in $pp$ collisions at $\sqrt{s}=13$ TeV with ATLAS
• Measurement of the production cross section for single top quarks in association with W bosons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Determination of jet calibration and energy resolution in proton-proton collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector
• Probing the quantum interference between singly and doubly resonant top-quark production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• A search for $B-L$ $R$-parity-violating top squarks in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS experiment
• Measurement of differential cross-sections of a single top quark produced in association with a $W$ boson at $\sqrt{s}=13$ TeV with ATLAS

Cited by in corpus (9)

• Software and computing for Run 3 of the ATLAS experiment at the LHC
• Combined SMEFT interpretation of Higgs, diboson, and top quark data from the LHC
• Observation of tW production in the single-lepton channel in pp collisions at $\sqrt{s}$ = 13 TeV
• One-loop squared amplitudes for hadronic $tW$ production at next-to-next-to-leading order in QCD
• Measurement of single top-quark production in association with a $W$ boson in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Staying on Top of SMEFT-Likelihood Analyses
• Constraining dimension-6 SMEFT with higher-order predictions for $pp\to tW$
• Approximate N${}^2$LO and N${}^3$LO QCD Predictions for $tW$ Production
• Searches for new interactions within the SMEFT framework at present and future colliders