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

ATLAS Publications, M. Faucci Giannelli, A. Hasib, M.P. Heath, X. Hoad, S. Palazzo, A. Søgaard, A. Strubig, E.P. Takeva, A.J. Taylor, A. Washbrook

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Abstract / Description of output

The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at √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 t W signal from the dominant t ¯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 σt W = 26 ± 7 pb, in good agreement with the Standard Model expectation.
Original languageEnglish
Article number720
Pages (from-to)1-29
Number of pages29
JournalThe European Physical Journal C
Volume81
Issue number8
DOIs
Publication statusPublished - 10 Aug 2021

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