Jet energy measurement with the ATLAS detector in proton-proton collisions at $\sqrt{s}=7$ TeV - INSPIRE

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Jet energy measurement with the ATLAS detector in proton-proton collisions at $\sqrt{s}=7$ TeV

ATLAS

Collaboration

Dec, 2011

100 pages

Published in:

Eur.Phys.J.C 73 (2013) 3, 2304

Published: Mar 2, 2013

e-Print:

1112.6426 [hep-ex]

DOI:

10.1140/epjc/s10052-013-2304-2

Report number:

CERN-PH-EP-2011-191

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (arXiv)

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 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.

Note:

100 pages plus author list (111 pages total), 93 figures, 17 tables, submitted to European Physical Journal C

jet: energy
jet: calibration
p p: scattering
jet: transverse momentum
jet: energy resolution
jet: particle identification
flavor: dependence
numerical calculations: Monte Carlo
ATLAS

References(95)

Figures(195)

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