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Electron and photon energy calibration with the ATLAS detector using LHC Run 2 data
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille; France.
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0003-0910-2209
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics.
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Number of Authors: 28102024 (English)In: Journal of Instrumentation, E-ISSN 1748-0221, Vol. 19, no 2, article id P02009Article in journal (Refereed) Published
Abstract [en]

This paper presents the electron and photon energy calibration obtained with the ATLAS detector using 140 fb−1 of LHC proton-proton collision data recorded at √s = 13 TeV between 2015 and 2018. Methods for the measurement of electron and photon energies are outlined, along with the current knowledge of the passive material in front of the ATLAS electromagnetic calorimeter. The energy calibration steps are discussed in detail, with emphasis on the improvements introduced in this paper. The absolute energy scale is set using a large sample of Z-boson decays into electron-positron pairs, and its residual dependence on the electron energy is used for the first time to further constrain systematic uncertainties. The achieved calibration uncertainties are typically 0.05% for electrons from resonant Z-boson decays, 0.4% at ET ∼ 10 GeV, and 0.3% at ET ∼ 1 TeV; for photons at ET ∼ 60 GeV, they are 0.2% on average. This is more than twice as precise as the previous calibration. The new energy calibration is validated using J/ → ee and radiative Z-boson decays.

Place, publisher, year, edition, pages
IOP Publishing , 2024. Vol. 19, no 2, article id P02009
Keywords [en]
calibration, Calorimeter methods; Pattern recognition, cluster finding, fitting methods; Performance of High Energy Physics Detectors
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-344206DOI: 10.1088/1748-0221/19/02/P02009ISI: 001185791500005Scopus ID: 2-s2.0-85185886671OAI: oai:DiVA.org:kth-344206DiVA, id: diva2:1842926
Note

QC 20240308

Available from: 2024-03-06 Created: 2024-03-06 Last updated: 2024-05-02Bibliographically approved

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Leroy, CorentinLund-Jensen, BengtStrandberg, Jonas

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Leroy, CorentinLund-Jensen, BengtLuongo, N. A.Oide, H.Shahinian, J. D.Strandberg, Jonas
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