Measurement of single top-quark production in association with a W boson in the single-lepton channel at √s = 8TeV with the ATLAS detector

ATLAS Collaboration

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Abstract

The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at √s = 8TeV. The dataset corresponds to an integrated luminosity of 20.2fb−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 tt̅ 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 σtW=26±7pb, in good agreement with the Standard Model expectation.
Original languageEnglish
Article number720
Number of pages29
JournalEur. Phys. J. C
Volume81
Issue number8
DOIs
Publication statusPublished - 10 Aug 2021

Keywords

  • hep-ex

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