Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
Name
Khachatryan_2017_J._Inst._12_P02014.pdf
Description
Published version
Size
3.82 MB
Format
Adobe PDF
Checksum (MD5)
70824ca20c6d0a9bcbf699fe731754ca
Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Demiragli, Zeynep
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Date Issued
February 2017
Journal
Journal of Instrumentation
Publisher
IOP Publishing
Citation
Khachatryan, V. et al. "Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV." Journal of Instrumentation 12 (February 2017): P02014 © 2017 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
Improved jet energy scale corrections, based on a data sample corresponding to an integrated luminosity of 19.7 fb ⁻¹ collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 8 TeV, are presented. The corrections as a function of pseudorapidity η and transverse momentum pT are extracted from data and simulated events combining several channels and methods. They account successively for the effects of pileup, uniformity of the detector response, and residual data-simulation jet energy scale differences. Further corrections, depending on the jet flavor and distance parameter (jet size) R, are also presented. The jet energy resolution is measured in data and simulated events and is studied as a function of pileup, jet size, and jet flavor. Typical jet energy resolutions at the central rapidities are 15-20% at 30 GeV, about 10% at 100 GeV, and 5% at 1 TeV. The studies exploit events with dijet topology, as well as photon+jet, Z+jet and multijet events. Several new techniques are used to account for the various sources of jet energy scale corrections, and a full set of uncertainties, and their correlations, are provided.The final uncertainties on the jet energy scale are below 3% across the phase space considered by most analyses (pT > 30 GeV and |η| < 5:0). In the barrel region (|η| < 1:3) an uncertainty below 1% for pT > 30 GeV is reached, when excluding the jet flavor uncertainties, which are provided separately for different jet flavors. A new benchmark for jet energy scale determination at hadron colliders is achieved with 0.32% uncertainty for jets with pT of the order of 165-330 GeV, and |η| < 0:8.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1088/1748-0221/12/02/P02014
