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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

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The production cross-section of a top quark in association with a W boson is measured using proton-proton collisions at $$\sqrt{s} = 8\,\text {TeV}$$. The dataset corresponds to an integrated luminosity of $$20.2\,\text {fb}^{-1}$$, and was collected in 2012 by the ATLAS detector at the Large Hadron...

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Main Authors: Aad, Georges (Author) , Andrei, George Victor (Author) , Antel, Claire (Author) , Dunford, Monica (Author) , Anders, Christoph (Author) , Bolz, Arthur (Author) , Ferreira de Lima, Danilo Enoque (Author) , Franchino, Silvia (Author) , Helary, Louis (Author) , Jongmanns, Jan (Author) , Klassen, Martin (Author) , Kolb, Mathis (Author) , Kugel, Andreas (Author) , Krishnan, Anjali (Author) , Meyer zu Theenhausen, Hanno (Author) , Lisovyi, Mykhailo (Author) , Napolitano, Fabrizio (Author) , S̜ahinsoy, Merve (Author) , Ott, Philipp (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Spieker, Thomas (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Suchek, Stanislav (Author) , Vigani, Luigi (Author) , Wang, Jike (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Yue, Xiaoguang (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 10 August 2021
In: The European physical journal. C, Particles and fields
Year: 2021, Volume: 81, Issue: 8, Pages: 1-29
ISSN:1434-6052
DOI:10.1140/epjc/s10052-021-09371-7
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-021-09371-7
Verlag, lizenzpflichtig, Volltext: https://link.springer.com/content/pdf/10.1140/epjc/s10052-021-09371-7.pdf
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Author Notes:ATLAS Collaboration*
Description
Summary:The production cross-section of a top quark in association with a W boson is measured using proton-proton collisions at $$\sqrt{s} = 8\,\text {TeV}$$. The dataset corresponds to an integrated luminosity of $$20.2\,\text {fb}^{-1}$$, 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 $$\sigma _{tW} = 26 \pm 7\,\text {pb}$$, in good agreement with the Standard Model expectation.
Item Description:ATLAS Collaboration*: G. Aad, C.F. Anders, V. Andrei, C. Antel, A.E. Bolz, M. Dunford, D.E. Ferreira de Lima, S. Franchino, L. Helary, J. Jongmanns, M. Klassen, M. Kolb, A. Krishnan, A. Kugel, M. Lisovyi, H. Meyer Zu Theenhausen, F. Napolitano, P.S. Ott, M. Sahinsoy, A. Schoening, H.-C. Schultz-Coulon, T.M. Spieker, R. Stamen, P. Starovoutov, S. Suchek, L, Vigani, J. Wang, S.M. Weber, M. Wessels, X. Yue [und viele weitere Personen]
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Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-021-09371-7

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