Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV

By Atlas Collaboration. 2011

568 citations recorded by the source corpus.

The jet energy scale (JES) and its systematic uncertainty ar e determined for jets measured with the ATLAS detector at the LHC in proton-proton collision data at a cent re-of-mass energy of √ s= 7 TeV corresponding to an integrated luminosity of 38 pb −1. Jets are reconstructed with the antikt algorithm with distance parameters R= 0.4 or R= 0.6. Jet energy and angle corrections are determined from Mont e Carlo simulations to calibrate jets with transverse momentapT ≥ 20 GeV and pseudorapidities |η| < 4.5. The JES systematic uncertainty is estimated using the sin gle isolated hadron response measured in situ and in test-beams, exploiting the transverse momentum bala nce between central and forward jets in events with dijet topologies and studying systematic variations in Monte Carlo simulations . The JES uncertainty is less than 2 .5% in the central calorimeter region ( |η| < 0.8) for jets with 60≤ pT < 800 GeV, and is maximally 14% forpT < 30 GeV in the most forward region 3 .2 ≤ |η| < 4.5. The uncertainty for additional energy from multiple proton-proton collisions in the same b unch crossing is less than 1 .5% per additional collision for jets with pT > 50 GeV after a dedicated correction for this effect. The JES i s 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 photonpT, the sum of the transverse momenta of tracks associated to th e jet, or a system of lowpT jets recoiling against a highpT jet. More sophisticated jet calibration schemes are presen t d based on calorimeter cell energy density weighting or hadronic properties of jets, pr oviding an improved jet energy resolution and a reduced flavour dependence of the jet response. The JES systematic un certai ty determined from a combination of in situ techniques are consistent with the one derived from single h adron response measurements over a wide kinematic range. The nominal corrections and uncertainties are derived for i s lated jets in an inclusive sample of highpT jets. Special cases such as event topologies with close-by jets, or select ions of samples with an enhanced content of jets originating from light quarks, heavy quarks or gluons are also discussed and the corresponding uncertainties are determined. 2 ATLAS collaboration: Jet measurement with the ATLAS detec tor

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/63316505885864bf258c770c01c3972839352ec4

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Citations in the corpus

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Performance of b-jet identification in the ATLAS experiment (2015, methodology): “The jet energy in the simulated sample is corrected to match the scale and resolution observed in data, extracted from inclusive dijet samples and γ/Z+jet samples [65].”
Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector (2015, unknown): “response and modelling of in situ jet calibration [35, 36].”
ATLAS search for new phenomena in dijet mass and angular distributions using pp collisions at √s=7 TeV (2012, unknown): “The EM and hadronic calibration steps above are referred to collectively as the “EM+JES” scheme [31], which restores the hadronic jet response in MC to within 2%.”
Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC (2012, unknown): “5 [101].”
Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at √s=13 TeV with the ATLAS detector (2017, methodology): “The systematic uncertainties are averaged and smoothed with the same combination procedure through a linear transformation [3, 13].”
Jet mass and substructure of inclusive jets in sqrt(s) = 7 TeV pp collisions with the ATLAS experiment (2012, methodology): “Cluster energies are corrected with calibration constants, which depend on the cluster classification to account for calorimeter non-compensation [25].”
Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC (2013, methodology): “Jets [22,23] are built from topological clusters [24] using the anti-kt algorithm [25] with a distance parameter R = 0.”
Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV (2016, methodology): “[14], with events where a high-pT barrel jet is balanced by a recoil system, composed of two or more lower-pT jets.”
Performance of jet substructure techniques for large-R jets in proton-proton collisions at $ \sqrt{s}=7 $ TeV using the ATLAS detector (2013, methodology): “There is no explicit offset correction for pile-up contributions, as in the standard JES procedure [48].”
Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1 (2016, unknown): “[38], in 2010 data (no pile-up) and the corresponding MC simulations.”