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First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at root s=13 TeV

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dc.contributor.authorCMS Collaboration
dc.contributor.authorBuccilli, A.
dc.contributor.authorCharaf, O.
dc.contributor.authorCooper, S.I.
dc.contributor.authorDi Croce, D.
dc.contributor.authorGleyzer, S.V.
dc.contributor.authorHenderson, C.
dc.contributor.authorPerez, C.U.
dc.contributor.authorRumerio, P.
dc.contributor.authorWest, C.
dc.contributor.otherYerevan Physics Institute
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dc.date.accessioned2022-08-02T15:23:07Z
dc.date.available2022-08-02T15:23:07Z
dc.date.issued2021
dc.description.abstractThe first measurement of the inclusive cross section for top quark pairs (\(t\stackrel{‾}{t}\)) produced in association with two additional charm jets is presented. The analysis uses the dileptonic final states of \(t\stackrel{‾}{t}\) events produced in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of \(41.5\phantom{\rule{0.25em}{0ex}}{\text{fb}}^{-1}\), recorded by the CMS experiment at the LHC. A new charm jet identification algorithm provides input to a neural network that is trained to distinguish among \(t\stackrel{‾}{t}\) events with two additional charm (\(t\stackrel{‾}{t}c\stackrel{‾}{c}\)), bottom (\(t\stackrel{‾}{t}b\stackrel{‾}{b}\)), and light-flavour or gluon (\(t\stackrel{‾}{t}\text{LL}\)) jets. By means of a template fitting procedure, the inclusive \(t\stackrel{‾}{t}c\stackrel{‾}{c}\), \(t\stackrel{‾}{t}b\stackrel{‾}{b}\), and \(t\stackrel{‾}{t}\text{LL}\) cross sections are simultaneously measured, together with their ratios to the inclusive \(t\stackrel{‾}{t}\) + two jets cross section. This provides measurements of the \(t\stackrel{‾}{t}c\stackrel{‾}{c}\) and \(t\stackrel{‾}{t}b\stackrel{‾}{b}\) cross sections of \(10.1±1.2\phantom{\rule{0.25em}{0ex}}\text{(stat)}±1.4\phantom{\rule{0.25em}{0ex}}\text{(syst)}\phantom{\rule{0.2em}{0ex}}\text{pb}\) and \(4.54±0.35\phantom{\rule{0.25em}{0ex}}\text{(stat)}±0.56\phantom{\rule{0.25em}{0ex}}\text{(syst)}\phantom{\rule{0.2em}{0ex}}\text{pb}\), respectively, in the full phase space. The results are compared and found to be consistent with predictions from two different matrix element generators with next-to-leading order accuracy in quantum chromodynamics, interfaced with a parton shower simulation.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationSirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Escalante Del Valle, A., Frühwirth, R., Jeitler, M., Krammer, N., Lechner, L., Liko, D., Mikulec, I., Pitters, F. M., Schieck, J., Schöfbeck, R., Spanring, M., Templ, S., Waltenberger, W., Wulz, C.-E., … Vetens, W. (2021). First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s=13TeV. Physics Letters. Part B, 820(136565), 136565. https://doi.org/10.1016/j.physletb.2021.136565
dc.identifier.doi10.1016/j.physletb.2021.136565
dc.identifier.orcidhttps://orcid.org/0000-0002-1122-7919
dc.identifier.urihttps://ir.ua.edu/handle/123456789/9312
dc.languageEnglish
dc.language.isoen_US
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.subjectCMS
dc.subjectTop quark
dc.subjectDilepton
dc.subjectCharm quark
dc.subjectCharm-tagging
dc.subjectHeavy-flavour
dc.subjectFRAGMENTATION
dc.subjectAstronomy & Astrophysics
dc.subjectPhysics, Nuclear
dc.subjectPhysics, Particles & Fields
dc.subjectPhysics
dc.titleFirst measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at root s=13 TeVen_US
dc.typetext
dc.typeArticle

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