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


ATLAS Collaboration; Aad, G; Abajyan, T; Abbott, B; Abbott, B; Canelli, F; et al (2015). Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector. European Physical Journal C - Particles and Fields, 75:17.

Abstract

The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton-proton collision data with a centre-of-mass energy of $\sqrt{s}=7$ TeV corresponding to an integrated luminosity of 4.7 fb$^{-1}$. Jets are reconstructed from energy deposits forming topological clusters of calorimeter cells using the anti-k$_t$ algorithm with distance parameters $R=0.4$ or $R=0.6$, and are calibrated using MC simulations. A residual JES correction is applied to account for differences between data and MC simulations. This correction and its systematic uncertainty are estimated using a combination of in situ techniques exploiting the transverse momentum balance between a jet and a reference object such as a photon or a Z boson, for $20 < p_T < 1000$ GeV and pseudorapidities $|\eta|<4.5$. The effect of multiple proton-proton interactions is corrected for, and an uncertainty is evaluatedusing in situ techniques. The smallest JES uncertainty of less than $1 %$ is found in the central calorimeter region($|\eta|<1.2$) for jets with $55< p_T< 500$ GeV. For central jets at lower $p_T$, the uncertainty is about $3 %$. A consistent JES estimate is found using measurements of the calorimeter response of single hadrons in proton-proton collisionsand test-beam data, which also provide the estimate for $p_{T,jet} > 1$ TeV. The calibration of forward jets is derived from dijet $p_T$ balance measurements. The resulting uncertainty reaches its largest value of $6%$ for low-$p_T$ jets at $|\eta|=4.5$. Additional JES uncertainties due to specific event topologies, such as close-by jets or selections of event samples with an enhanced content of jets originating from light quarks or gluons, are also discussed. The magnitude of these uncertainties depends on the event sample used in a given physics analysis, but typically amounts to $0.5%$ to $3%$.

Abstract

The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton-proton collision data with a centre-of-mass energy of $\sqrt{s}=7$ TeV corresponding to an integrated luminosity of 4.7 fb$^{-1}$. Jets are reconstructed from energy deposits forming topological clusters of calorimeter cells using the anti-k$_t$ algorithm with distance parameters $R=0.4$ or $R=0.6$, and are calibrated using MC simulations. A residual JES correction is applied to account for differences between data and MC simulations. This correction and its systematic uncertainty are estimated using a combination of in situ techniques exploiting the transverse momentum balance between a jet and a reference object such as a photon or a Z boson, for $20 < p_T < 1000$ GeV and pseudorapidities $|\eta|<4.5$. The effect of multiple proton-proton interactions is corrected for, and an uncertainty is evaluatedusing in situ techniques. The smallest JES uncertainty of less than $1 %$ is found in the central calorimeter region($|\eta|<1.2$) for jets with $55< p_T< 500$ GeV. For central jets at lower $p_T$, the uncertainty is about $3 %$. A consistent JES estimate is found using measurements of the calorimeter response of single hadrons in proton-proton collisionsand test-beam data, which also provide the estimate for $p_{T,jet} > 1$ TeV. The calibration of forward jets is derived from dijet $p_T$ balance measurements. The resulting uncertainty reaches its largest value of $6%$ for low-$p_T$ jets at $|\eta|=4.5$. Additional JES uncertainties due to specific event topologies, such as close-by jets or selections of event samples with an enhanced content of jets originating from light quarks or gluons, are also discussed. The magnitude of these uncertainties depends on the event sample used in a given physics analysis, but typically amounts to $0.5%$ to $3%$.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:15 January 2015
Deposited On:12 Feb 2016 13:05
Last Modified:08 Dec 2017 18:19
Publisher:Springer
ISSN:1434-6044
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-014-3190-y
Other Identification Number:arXiv:1406.0076v3

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