Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data

By G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, M. Abolins, O. AbouZeid, H. Abramowicz and 489 more. 2014

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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 $\sqrt{s}$ = 7 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/48f04b211d247127c383a13ab3811afa936ad1b7

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Citations in the corpus

Measurement of the Higgs boson mass from the H→γγ and H→ZZ∗→4ℓ channels with the ATLAS detector using 25 fb−1 of pp collision data (2014, background): “[19], and the understanding of the muon momentum scale and resolution presented in Ref.”
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Electron efficiency measurements with the ATLAS detector using 2012 LHC proton–proton collision data (2016, unknown): “energy scales and the EM accordion calorimeter strip-to-middle-layer energy-scale ratios are also corrected [8].”
Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at √s=13 TeV with the ATLAS detector (2017, methodology): “Table 1: Summary of the systematic uncertainties in the JES, including those propagated from electron, photon, and muon energy scale calibrations [16, 38].”
Measurements of the properties of the Higgs-like boson in the four lepton decay channel with the ATLAS detector using 25 fb$^{-1}$ of proton-proton collision data (2013, methodology): “The calibration procedure for electrons and photons is described in [12].”
Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC (2017, unknown): “An energy calibration specifically optimized for photons 38 is applied to the candidates to account for upstream energy loss and both lateral and longitudinal shower leakage.”
Search for exclusive Higgs and Z boson decays to ϕγ and ργ with the ATLAS detector (2017, methodology): “The photon energy scale uncertainty, determined from Z → e+e− events and validated using Z → ``γ events [65], is propagated through the simulated signal samples as a function of η and pγT.”
Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector (2015, unknown): “In contrast to the standard ATLAS electronselection requirements [48], no requirement on the number of silicon hits is applied.”
Search for new phenomena in high-mass diphoton final states using 37 fb−1 of proton–proton collisions collected at s=13 TeV with the ATLAS detector (2017, unknown): “The energy measurement is based on a multivariate regression algorithm [38] used to determine corrections to the energy of the clusters, developed and optimized on simulated events.”