Measurements of top-quark pair spin correlations in the e? channel at ? s = 13 TeV using pp collisions in the ATLAS detector

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dc.WoS.categoriesPhysics, Particles & Fieldsen_US
dc.authorid0000-0001-5050-8441en_US
dc.contributor.authorÇetin, Serkant Ali
dc.date.accessioned2020-11-09T12:16:43Z
dc.date.available2020-11-09T12:16:43Z
dc.date.issued2020-08-19
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description43 pagesen_US
dc.description.abstractA measurement of observables sensitive to spin correlations in tt<overbar></mml:mover> production is presented, using 36.1 fb-1 of pp collision data at <mml:msqrt>s</mml:msqrt>=13 TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon with opposite-sign electric charge as a function of the azimuthal opening angle and the absolute difference in pseudorapidity between the electron and muon candidates in the laboratory frame. The azimuthal opening angle is also measured as a function of the invariant mass of the t<mml:mover accent="true">t<mml:mo stretchy="false"><overbar></mml:mover> system. The measured differential cross-sections are compared to predictions by several NLO Monte Carlo generators and fixed-order calculations. The observed degree of spin correlation is somewhat higher than predicted by the generators used. The data are consistent with the prediction of one of the fixed-order calculations at NLO, but agree less well with higher-order predictions. Using these leptonic observables, a search is performed for pair production of supersymmetric top squarks decaying into Standard Model top quarks and light neutralinos. Top squark masses between 170 and 230 GeV are largely excluded at the 95% confidence level for kinematically allowed values of the neutralino mass.en_US
dc.description.tableofcontentsIntroduction . . . . . . . . . . . . . . . . . . . . . 1 2 ATLAS detector . . . . . . . . . . . . . . . . . . . 2 3 Data and Monte Carlo simulation . . . . . . . . . . 3 4 Event selection and reconstruction . . . . . . . . . 4 4.1 Object and event selection . . . . . . . . . . 4 4.2 Reconstruction of the t ¯t system . . . . . . . . 6 4.3 Definitions of partons and particles . . . . . . 9 5 Unfolding procedure . . . . . . . . . . . . . . . . 10 6 Systematic uncertainties . . . . . . . . . . . . . . 12 6.1 Signal modelling uncertainties . . . . . . . . 12 6.2 Background modelling uncertainties . . . . . 12 6.3 Detector modelling uncertainties . . . . . . . 12 7 Differential cross-section results . . . . . . . . . . 13 8 Spin correlation results . . . . . . . . . . . . . . . 14 9 SUSY interpretation . . . . . . . . . . . . . . . . 19 10 Conclusion . . . . . . . . . . . . . . . . . . . . . 24 References . . . . . . . . . . . . . . . . . . . . . . . . 26en_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1140/epjc/s10052-020-8181-6en_US
dc.identifier.issn1434-6052
dc.identifier.issn1434-6044
dc.identifier.scopus2-s2.0-85090083990en_US
dc.identifier.urihttps://hdl.handle.net/11411/2534
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-020-8181-6
dc.identifier.wosWOS:000565271700001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.issue8en_US
dc.language.isoenen_US
dc.nationalInternationalen_US
dc.numberofauthors1000+en_US
dc.publisherSpringeren_US
dc.relation.ispartofEuropean Physical Journal Cen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectDecayen_US
dc.subjectLepton Spectraen_US
dc.subjectTevatronen_US
dc.titleMeasurements of top-quark pair spin correlations in the e? channel at ? s = 13 TeV using pp collisions in the ATLAS detectoren_US
dc.typeArticleen_US
dc.volume80en_US

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