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Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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Number of Authors: 2892
2014 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 74, no 10, 1-48 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents the electron and photon energy calibration achieved with the ATLAS detector using about 25 fb-1 of LHC proton–proton collision data taken at centre-of-mass energies of (Equation Present) and 8 TeV. The reconstruction of electron and photon energies is optimised using multivariate algorithms. The response of the calorimeter layers is equalised in data and simulation, and the longitudinal profile of the electromagnetic showers is exploited to estimate the passive material in front of the calorimeter and reoptimise the detector simulation. After all corrections, the Z resonance is used to set the absolute energy scale. For electrons from Z decays, the achieved calibration is typically accurate to 0.05 % in most of the detector acceptance, rising to 0.2 % in regions with large amounts of passive material. The remaining inaccuracy is less than 0.2–1 % for electrons with a transverse energy of 10 GeV, and is on average 0.3 % for photons. The detector resolution is determined with a relative inaccuracy of less than 10 % for electrons and photons up to 60 GeV transverse energy, rising to 40 % for transverse energies above 500 GeV.

Place, publisher, year, edition, pages
2014. Vol. 74, no 10, 1-48 p.
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Physical Sciences
URN: urn:nbn:se:kth:diva-159573DOI: 10.1140/epjc/s10052-014-3071-4ISI: 000346414700002ScopusID: 2-s2.0-84919918864OAI: diva2:785823
Swedish Research CouncilKnut and Alice Wallenberg Foundation

QC 20150204 Author count: 2892

Available from: 2015-02-04 Created: 2015-02-04 Last updated: 2015-02-04Bibliographically approved

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, Anthony K.Strandberg, Jonas
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