Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at ?s = 13 TeV

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dc.authorid0000-0002-9007-8260en_US
dc.contributor.authorYetkin, Elif Aslı
dc.date.accessioned2024-06-03T09:39:42Z
dc.date.available2024-06-03T09:39:42Z
dc.date.issued2023-06
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description.abstractResults are presented from a search for the Higgs boson decay H ? Z?, where Z ? ?+?? with ? = e or ?. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb?1. Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength ?, defined as the product of the cross section and the branching fraction ?pp?HBH?Z? relative to the standard model prediction, is extracted from a simultaneous fit to the ?+??? invariant mass distributions in all categories and is measured to be ? = 2.4 ± 0.9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to ?pp?HBH?Z?=0.21±0.08 pb. The observed (expected) upper limit at 95% confidence level on ? is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions BH?Z?/BH??? is measured to be 1.5?0.6+0.7, which agrees with the standard model prediction of 0.69 ± 0.04 at the 1.5 standard deviation level. © The Author(s) 2023.en_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1007/JHEP05(2023)233
dc.identifier.issn1029-8479
dc.identifier.scopus2-s2.0-85182816030en_US
dc.identifier.urihttps://hdl.handle.net/11411/5353
dc.identifier.urihttps://doi.org/10.1007/JHEP05(2023)233
dc.identifier.wosWOS:001022881400001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.issue5en_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.subjectBeyond Standard Modelen_US
dc.subjectHadron-Hadron Scatteringen_US
dc.subjectHiggs Physicsen_US
dc.titleSearch for Higgs boson decays to a Z boson and a photon in proton-proton collisions at ?s = 13 TeV
dc.typeArticle
dc.volume2023en_US

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