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dc.contributor.authorSirunyan, A. M.pt_BR
dc.contributor.authorSilveira, Gustavo Gil dapt_BR
dc.contributor.authorCMS Collaborationpt_BR
dc.date.accessioned2020-07-10T03:41:32Zpt_BR
dc.date.issued2020pt_BR
dc.identifier.issn1029-8479pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/211670pt_BR
dc.description.abstractA measurement of the inclusive cross section of top quark pair production in association with a Z boson using proton-proton collisions at a center-of-mass energy of 13TeV at the LHC is performed. The data sample corresponds to an integrated luminosity of 77.5fb−1, collected by the CMS experiment during 2016 and 2017. The measurement is performed using final states containing three or four charged leptons (electrons or muons), and the Z boson is detected through its decay to an oppositely charged lepton pair. The production cross section is measured to be σ(ttZ) = 0.95±0.05(stat)±0.06(syst)pb. For the first time, differential cross sections are measured as functions of the transverse momentum of the Z boson and the angular distribution of the negatively charged lepton from the Z boson decay. The most stringent direct limits to date on the anomalous couplings of the top quark to the Z boson are presented, including constraints on the Wilson coefficients in the framework of the standard model effective field theory.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofThe journal of high energy physics. Trieste. No. 3 (Mar. 2020), 56, 50 p.pt_BR
dc.rightsOpen Accessen
dc.subjectHadron-Hadron scattering (experiments)en
dc.subjectAceleradores de partículaspt_BR
dc.subjectColisões proton-protonpt_BR
dc.subjectTop physicsen
dc.subjectBosons Zpt_BR
dc.titleMeasurement of top quark pair production in association with a Z boson in proton-proton collisions at √s = 13 TeVpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001115018pt_BR
dc.type.originEstrangeiropt_BR


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