Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at ?s = 13 TeV

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dc.contributor.authorYetkin, Elif Aslı
dc.date.accessioned2022-11-07T10:54:29Z
dc.date.available2022-11-07T10:54:29Z
dc.date.issued2022-02
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description.abstractAbstract: Inclusive and differential cross sections of single top quark production in association with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an integrated luminosity of 138 fb?1 recorded by the CMS experiment. Events are selected based on the presence of three leptons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of 87.9?7.3+7.5(stat)?6.0+7.3(syst) fb for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations and represents the most precise determination to date. The ratio between the cross sections for the top quark and the top antiquark production in association with a Z boson is measured as 2.37?0.42+0.56(stat)?0.13+0.27(syst). Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agreement, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be 0.54 ± 0.16 (stat) ± 0.06 (syst), in agreement with SM predictions. [Figure not available: see fulltext.] © 2022, The Author(s).en_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1007/JHEP02(2022)107en_US
dc.identifier.issn1029-8479
dc.identifier.scopus2-s2.0-85125377511en_US
dc.identifier.urihttps://hdl.handle.net/11411/4646
dc.identifier.urihttps://doi.org/10.1007/JHEP02(2022)107
dc.identifier.wosWOS:000757369100002en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.issue2en_US
dc.language.isoenen_US
dc.nationalInternationalen_US
dc.numberofauthors100+en_US
dc.publisherSpringer Science and Business Media Deutschland GmbHen_US
dc.relation.ispartofJournal of High Energy Physicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectHadron-Hadron Scatteringen_US
dc.subjectTop Physicsen_US
dc.titleInclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at ?s = 13 TeVen_US
dc.typeArticleen_US
dc.volume2022en_US

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