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Title
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Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at = 7 TeV
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| Characteristics of multi-particle production in proton-proton collisions at root 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 |eta|< 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. |
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Language
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English
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Source (journal)
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European physical journal : C : particles and fields. - Berlin
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Publication
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Berlin
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2013
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ISSN
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1434-6044
1434-6052
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DOI
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10.1140/EPJC/S10052-013-2674-5
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Volume/pages
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73
:12
(2013)
, p. 1-26
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Article Reference
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2674
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ISI
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000328342400001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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