Jet and underlying event properties as a function of charged-particle multiplicity in proton–proton collisions at √s= 7 TeV
Name
10.1140%2Fepjc%2Fs10052-013-2674-5.pdf
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1.15 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
CMS Collaboration
Apyan, Aram
Bauer, Gerry P
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Date Issued
December 2013
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer-Verlag
Citation
Chatrchyan, S. et al. “Jet and underlying event properties as a function of charged-particle multiplicity in proton–proton collisions at √s= 7 TeV.” The European Physical Journal C 73, 12 (December 2013): 2674 © 2013 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
Characteristics of multi-particle production in proton-proton collisions at √s = 7 TeV are studied as a function of the charged-particle multiplicity, N ch . The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity {pipe}η{pipe} < 2.4 and transverse momentum p T > 0.25 GeV/c. Jets are reconstructed from charged-particles only and required to have p T > 5 GeV/c. The distributions of jet p T , average p T of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of N ch and compared to the predictions of the pythia and herwig event generators. Predictions without multi-parton interactions fail completely to describe the N ch -dependence observed in the data. For increasing N ch , pythia systematically predicts higher jet rates and harder p T spectra than seen in the data, whereas herwig shows the opposite trends. At the highest multiplicity, the data-model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/EPJC/S10052-013-2674-5
