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Measurement of the production cross-section of a single top quark inassociation with a Z boson in proton-proton collisions at 13 TeV withthe ATLAS detector
Univ Mohamed Premier, Fac Sci, Oujda, Morocco.;LPTPM, Oujda, Morocco..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-6945-1916
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8015-7512
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Number of Authors: 29002018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 780, p. 557-577, article id 487Article 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 s=13TeV are used, corresponding to an integrated luminosity of 36.1fb−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¯ and Z+jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2σ in the data and the expected significance is 5.4σ. The measured cross-section for tZq production is 600±170(stat.)±140(syst.)fb.

Place, publisher, year, edition, pages
Elsevier , 2018. Vol. 780, p. 557-577, article id 487
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-233190DOI: 10.1016/j.physletb.2018.03.023ISI: 000432187800078Scopus ID: 2-s2.0-85044925674OAI: oai:DiVA.org:kth-233190DiVA, id: diva2:1238463
Note

QC 20180806

Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-08-13Bibliographically approved

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Kastanas, Konstatinos A.Lund-Jensen, BengtOhm, ChristianRipellino, GiuliaSidebo, P. EdvinStrandberg, Jonas

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Physics Letters B
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