Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run 2 data collected in 2015 and 2016

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dc.WoS.categoriesPhysics, Particles & Fieldsen_US
dc.authorid0000-0001-5050-8441en_US
dc.contributor.authorÇetin, Serkant Ali
dc.date.accessioned2021-01-22T06:48:04Z
dc.date.available2021-01-22T06:48:04Z
dc.date.issued2019-03-07
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description.abstractThe efficiency of the photon identification criteria in the ATLAS detector is measured using 36.1 fb1 to 36.7 fb1 of pp collision data at v s = 13 TeV collected in 2015 and 2016. The efficiencies are measured separately for converted and unconverted isolated photons, in four different pseudorapidity regions, for transverse momenta between 10 GeV and 1.5 TeV. The results from the combination of three data-driven techniques are compared with the predictions from simulation after correcting the variables describing the shape of electromagnetic showers in simulation for the average differences observed relative to data. Data-tosimulation efficiency ratios are determined to account for the small residual efficiency differences. These factors are measured with uncertainties between 0.5% and 5% depending on the photon transverse momentum and pseudorapidity. The impact of the isolation criteria on the photon identification efficiency, and that of additional soft pp interactions, are also discussed. The probability of reconstructing an electron as a photon candidate ismeasured in data, and compared with the predictions from simulation. The efficiency of the reconstruction of photon conversions is measured using a sample of photon candidates from Z. mu mu. events, exploiting the properties of the ratio of the energies deposited in the first and second longitudinal layers of the ATLAS electromagnetic calorimeter.en_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1140/epjc/s10052-019-6650-6
dc.identifier.issn1434-6052
dc.identifier.issn1434-6044
dc.identifier.scopus2-s2.0-85062611658en_US
dc.identifier.urihttps://hdl.handle.net/11411/3157
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-019-6650-6
dc.identifier.wosWOS:000460674700008en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.issue3en_US
dc.language.isoenen_US
dc.nationalInternationalen_US
dc.numberofauthors200+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.subjectROOT-S=13 TEVen_US
dc.subjectPP COLLISIONSen_US
dc.subjectMASSen_US
dc.titleMeasurement of the photon identification efficiencies with the ATLAS detector using LHC Run 2 data collected in 2015 and 2016
dc.typeArticle
dc.volume79en_US

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