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arXiv · 2007.01554

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

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 $\sqrt{s} = 8$ 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 $σ_{tW} = 26 \pm 7$ pb, in good agreement with the Standard Model expectation.

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ATLAS Collaboration. 2021-08-23. 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. https://doi.org/10.1140/epjc%2Fs10052-021-09371-7

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