Measurement of the tt[bar]Z and tt[bar]W cross sections in proton-proton collisions at √s=13  TeV with the ATLAS detector

A measurement of the associated production of a top-quark pair (t¯t) with a vector boson (W, Z) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using 36.1 fb−1 of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in...

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Main Authors: Aaboud, Morad (Author) , Anders, Christoph (Author) , Andrei, George Victor (Author) , Antel, Claire (Author) , Baas, Alessandra Edda (Author) , Bolz, Arthur (Author) , Brandt, Oleg (Author) , Dunford, Monica (Author) , Ferreira de Lima, Danilo Enoque (Author) , Franchino, Silvia (Author) , Geisler, Manuel Patrice (Author) , Giulini, Maddalena (Author) , Hanke, Paul (Author) , Jongmanns, Jan (Author) , Kolb, Mathis (Author) , Kugel, Andreas (Author) , Lisovyi, Mykhailo (Author) , Meyer zu Theenhausen, Hanno (Author) , Napolitano, Fabrizio (Author) , Narrias Villar, Daniel Isaac (Author) , S̜ahinsoy, Merve (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Spieker, Thomas (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Suchek, Stanislav (Author) , Wang, Jike (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Yue, Xiaoguang (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 29 April 2019
In: Physical review
Year: 2019, Volume: 99, Issue: 9
ISSN:2470-0029
DOI:10.1103/PhysRevD.99.072009
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.99.072009
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.99.072009
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Author Notes:M. Aaboud et al. (ATLAS Collaboration)

MARC

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520 |a A measurement of the associated production of a top-quark pair (t¯t) with a vector boson (W, Z) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using 36.1 fb−1 of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The t¯tZ and t¯tW production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are σt¯tZ=0.95±0.08stat±0.10syst pb and σt¯tW=0.87±0.13stat±0.14syst pb in agreement with the Standard Model predictions. The measurement of the t¯tZ cross section is used to set constraints on effective field theory operators which modify the t¯tZ vertex. 
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