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Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV with the ATLAS detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 29002018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 780, p. 557-577Article in journal (Refereed) Published
Abstract [en]

The production of a top quark in association with a Z boson is investigated. The proton-proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of root s = 13 TeV are used, corresponding to an integrated luminosity of 36.1 fb(-1). Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds are diboson, tt($)over-bar and Z + jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2 sigma in the data and the expected significance is 5.4 sigma. The measured cross-section for tZq production is 600 +/- 170(stat.)+/- 140(syst.)fb.

Place, publisher, year, edition, pages
2018. Vol. 780, p. 557-577
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-158155DOI: 10.1016/j.physletb.2018.03.023ISI: 000432187800078OAI: oai:DiVA.org:su-158155DiVA, id: diva2:1234248
Available from: 2018-07-23 Created: 2018-07-23 Last updated: 2018-07-23Bibliographically approved

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Abulaiti, YimingÅkerstedt, HenrikBertoli, GabrieleBessidskaia Bylund, OlgaBohm, ChristianCarney, Rebecca M. D.Clément, ChristopheCribbs, Wayne A.Hellman, StenJon-And, KerstinLundberg, OlofMilstead, David A.Moa, TorbjörnMolander, SimonShaikh, Nabila W.Shcherbakova, AnnaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraUghetto, MichaëlValdes Santurio, EduardoWallängen, Veronica
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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