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Article
Report number arXiv:1112.6426 ; CERN-PH-EP-2011-191 ; CERN-PH-EP-2011-191
Title Jet energy measurement with the ATLAS detector in proton-proton collisions at ss = 7 TeV
Related titleJet energy measurement with the ATLAS detector in proton-proton collisions at s=7s=7 TeV
Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV
Author(s) ATLAS Collaboration  Afficher les 3013 auteurs
Publication 2013-03-02
Imprint 30 Dec 2011
Number of pages 100
Note Comments: 100 pages plus author list (111 pages total), 93 figures, 17 tables, submitted to European Physical Journal C
100 pages plus author list (111 pages total), 93 figures, 17 tables, submitted to European Physical Journal C
In: Eur. Phys. J. C 73 (2013) 2304
DOI 10.1140/epjc/s10052-013-2304-2
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords detector ; jet physics ; calorimeter ; experimental results
Abstract The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector at the LHC in proton-proton collision data at a centre-of-mass energy of sqrt(s) = 7 TeV corresponding to an integrated luminosity of 38 inverse pb. Jets are reconstructed with the anti-kt algorithm with distance parameters R=0.4 or R=0.6. Jet energy and angle corrections are determined from Monte Carlo simulations to calibrate jets with transverse momenta pt > 20 GeV and pseudorapidities eta<4.5. The JES systematic uncertainty is estimated using the single isolated hadron response measured in situ and in test-beams. The JES uncertainty is less than 2.5% in the central calorimeter region (eta<0.8) for jets with 60 < pt < 800 GeV, and is maximally 14% for pt < 30 GeV in the most forward region 3.2<eta<4.5. The uncertainty for additional energy from multiple proton-proton collisions in the same bunch crossing is less than 1.5% per additional collision for jets with pt > 50 GeV after a dedicated correction for this effect. The JES is validated for jet transverse momenta up to 1 TeV to the level of a few percent using several in situ techniques by comparing a well-known reference such as the recoiling photon pt, the sum of the transverse momenta of tracks associated to the jet, or a system of low-pt jets recoiling against a high-pt jet. More sophisticated jet calibration schemes are presented based on calorimeter cell energy density weighting or hadronic properties of jets, providing an improved jet energy resolution and a reduced flavour dependence of the jet response. The JES systematic uncertainty determined from a combination of in situ techniques are consistent with the one derived from single hadron response measurements over a wide kinematic range. The nominal corrections and uncertainties are derived for isolated jets in an inclusive sample of high-pt jets.
Copyright/License publication: © 2013-2025 CERN (License: CC-BY-3.0)
preprint: © 2011-2025 CERN (License: CC-BY-3.0)



Corresponding record in: Inspire
Email contact: klaus.moenig@cern.ch


 Notice créée le 2011-12-30, modifiée le 2024-11-18


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