Search for production of four top quarks in final states with svame-sign or multiple leptons in proton-proton collisions at root s=13 TeV

Basit Öğe Kaydı
dc.WoS.categoriesPhysics, Particles & Fieldsen_US
dc.contributor.authorYetkin, Elif Aslı
dc.date.accessioned2020-06-03T11:54:47Z
dc.date.available2020-06-03T11:54:47Z
dc.date.issued2020-01-31
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description.abstractThe standard model (SM) production of four top quarks (tt over bar tt over ba in proton-proton collisions is studied by the CMS Collaboration. The data sample, collected during the 2016-2018 data taking of the LHC, corresponds to an integrated luminosity of 137fb-1 at a center-of-mass energy of 13TeV. The events are required to contain two same-sign charged leptons (electrons or muons) or at least three leptons, and jets. The observed and expected significances for the tt over bar tt over bar signal are respectively 2.6 and 2.7 standard deviations, and the tt over bar tt over bar cross section is measured to be 12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, yielding a limit of < 1. 7 is the SM value of yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, H. Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified dark matter models, with exclusion limits reaching 350-470GeV and 350-550GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.en_US
dc.description.sponsorshipBMBWF (Austria) Austrian Science Fund (FWF) Fonds de la Recherche Scientifique - FNRS FWOen_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1140/epjc/s10052-019-7593-7en_US
dc.identifier.issn1434-6052
dc.identifier.issn1434-6044
dc.identifier.pmid32108833en_US
dc.identifier.scopus2-s2.0-85078848913en_US
dc.identifier.urihttps://hdl.handle.net/11411/2143
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-019-7593-7
dc.identifier.wosWOS:000513235800003en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.issue2en_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.scopus.SNIP1.308en_US
dc.subjectModelen_US
dc.subjectExtensionen_US
dc.subjectInvarianten_US
dc.subjectDecayen_US
dc.titleSearch for production of four top quarks in final states with svame-sign or multiple leptons in proton-proton collisions at root s=13 TeVen_US
dc.typeArticleen_US
dc.volume80en_US

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