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.

42 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

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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