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

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dc.contributor.authorAaboud, M.
dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbbott, D. C.
dc.contributor.authorBelotskiy, K.
dc.contributor.authorBelyaev, N. L.
dc.contributor.authorBulekov, O.
dc.contributor.authorKantserov, V. A.
dc.contributor.authorKurova, A.
dc.contributor.authorPonomarenko, D.
dc.contributor.authorProklova, N.
dc.contributor.authorRomaniouk, A.
dc.contributor.authorSmirnov, N.
dc.contributor.authorSmirnov, S. Y.
dc.contributor.authorSmirnov, Y.
dc.contributor.authorSoldatov, E. Y.
dc.contributor.authorTimoshenko, S.
dc.contributor.authorVorobev, K.
dc.contributor.authorTikhomirov, V. O.
dc.contributor.authorБелоцкий, Константин Михайлович
dc.contributor.authorБулеков, Олег Владимирович
dc.contributor.authorКурова, Анастасия Сергеевна
dc.contributor.authorРоманюк, Анатолий Самсонович
dc.contributor.authorСмирнов, Сергей Юрьевич
dc.contributor.authorСмирнов, Юрий Сергеевич
dc.contributor.authorСолдатов, Евгений Юрьевич
dc.contributor.authorТимошенко, Сергей Леонидович
dc.contributor.authorВоробьёв, Константин Александрович
dc.contributor.authorТихомиров, Владимир Олегович
dc.date.accessioned2024-11-27T07:35:30Z
dc.date.available2024-11-27T07:35:30Z
dc.date.issued2020
dc.description.abstract© 2020, CERN for the benefit of the ATLAS Collaboration.A measurement of observables sensitive to spin correlations in tt¯ production is presented, using 36.1 fb - 1 of pp collision data at s=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 tt¯ 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.
dc.identifier.citationMeasurements of top-quark pair spin correlations in the eμ channel at √s=13 TeV using pp collisions in the ATLAS detector / Aaboud, M. [et al.] // European Physical Journal C. - 2020. - 80. - № 8. - 10.1140/epjc/s10052-020-8181-6
dc.identifier.doi10.1140/epjc/s10052-020-8181-6
dc.identifier.urihttps://www.doi.org/10.1140/epjc/s10052-020-8181-6
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85090083990&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000565271700001
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/22281
dc.relation.ispartofEuropean Physical Journal C
dc.titleMeasurements of top-quark pair spin correlations in the eμ channel at √s=13 TeV using pp collisions in the ATLAS detector
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue8
oaire.citation.volume80
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