Jet Energy Measurement and its Systematic Uncertainty in Proton-Proton Collisions at √s̅ = 7 TeV with the ATLAS Detector

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dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorAad, G.en_US
dc.contributor.authorAbajyan, T.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdel Khalek, S.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAben, R.en_US
dc.contributor.authorHaleem, M.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorNamasivayam, Harisankaren_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorWong, Wei-Chengen_US
dc.contributor.authorATLAS Collaborationen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.contributor.utdAuthorNamasivayam, Harisankaren_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.date.accessioned2015-03-18T15:33:52Z
dc.date.available2015-03-18T15:33:52Z
dc.date.created2015-01-15en_US
dc.date.issued2015-01-15en_US
dc.description.abstractThe jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton-proton collision data with a centre-of-mass energy of √s̅ = 7 TeV corresponding to an integrated luminosity of 4.7 fb⁻¹. Jets are reconstructed from energy deposits forming topological clusters of alorimeter cells using the anti-_k algorithm with distance parameters R = 0.4 or R = 0.6, and are calibrated using MC simulations. A residual JES correction is applied to account for differences between data and MC simulations. This correction and its systematic uncertainty are estimated using a combination of in situ techniques exploiting the transverse momentum balance between a jet and a reference object such as a photon or a Z boson, for 20 ≤ p_T ^{jet} < 1000 GeV and pseudorapidities |η| < 4.5. The effect of multiple proton-proton interactions is corrected for, and an uncertainty is evaluated using in situ techniques. The smallest JES uncertainty of less than 1% is found in the central calorimeter region (|η| < 1.2) for jets with 55 ≤ p{T}^{jet} < 500 GeV. For central jets at lower p{T}, the uncertainty is about 3%. A consistent JES estimate is found using measurements of the calorimeter response of single hadrons in proton?proton collisions and test-beam data, which also provide the estimate for p{T}^{jet} > 1 TeV. The calibration of forward jets is derived from dijet p{T} balance measurements. The resulting uncertainty reaches its largest value of 6% for low-p{T} jets at |η| = 4.5. Additional JES uncertainties due to specific event topologies, such as close-by jets or selections of event samples with an enhanced content of jets originating from light quarks or gluons, are also discussed. The magnitude of these uncertainties depends on the event sample used in a given physics analysis, but typically amounts to 0.5-3%.en_US
dc.identifier.bibliographicCitationAad, G., T. Abajyan, B. Abbott, et al. 2015. "Jet energy measurement and its systematic uncertainty in proton−proton collisions at √s = 7 TeV with the ATLAS detector." European Physical Journal C 75(17), doi:10.1140/epjc/s10052-014-3190-y.en_US
dc.identifier.issn1434-6044en_US
dc.identifier.issue17en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4347
dc.identifier.volume75en_US
dc.language.isoen_USen_US
dc.publisherSpringeren_US
dc.relation.urihttp://dx.doi.org/10.1140/epjc/s10052-014-3190-y
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2014 CERN, for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourceEuropean Physical Journal C
dc.subjectJets (Nuclear physics)en_US
dc.subjectProton-proton interactionsen_US
dc.subjectJet Energy Scaleen_US
dc.subjectUncertaintyen_US
dc.titleJet Energy Measurement and its Systematic Uncertainty in Proton-Proton Collisions at √s̅ = 7 TeV with the ATLAS Detectoren_US
dc.typeTexten_US
dc.type.genreArticleen_US

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Izen, Joseph M.
Lou, Xinchou
NSM Staff-Student Research