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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
Univ Mohamed Premier, Fac Sci, Oujda, Morocco;LPTPM, Oujda, Morocco.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0002-1253-8583
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics. Georg August Univ, Phys Inst 2, Gottingen, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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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
ELSEVIER SCIENCE BV , 2018. Vol. 780, p. 557-577
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-358093DOI: 10.1016/j.physletb.2018.03.023ISI: 000432187800078OAI: oai:DiVA.org:uu-358093DiVA, id: diva2:1241727
Funder
Swedish Research CouncilEU, European Research CouncilEU, FP7, Seventh Framework ProgrammeEU, Horizon 2020
Note

For complete list of authors see http://dx.doi.org/10.1016/j.physletb.2018.03.023

Available from: 2018-08-24 Created: 2018-08-24 Last updated: 2018-08-24Bibliographically approved

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Bergeås Kuutmann, ElinBokan, PetarBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P. O. JoakimIsacson, Max F.Mårtensson, Mikael U.F.Öhman, HenrikRangel Smith, CamilaSales De Bruin, Pedro H.
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