Centrality dependence of particle production in p-Pb collisions at √sNN=5.02 TeV
We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p−Pb collisions at √sNN=5.02TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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8 June 2015
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| In: |
Physical review. C, Nuclear physics
Year: 2015, Jahrgang: 91, Heft: 6, Pages: 1-28 |
| ISSN: | 1089-490X |
| DOI: | 10.1103/PhysRevC.91.064905 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.91.064905 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.91.064905 
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| Verfasserangaben: | J. Adam et al.* (ALICE Collaboration) |
MARC
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| 246 | 3 | 3 | |a Centrality dependence of particle production in p-Pb collisions at square root s NN = 5.02 TeV |
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| 500 | |a *ALICE Collaboration: J. Adam, V. Anguelov, O. Busch, P. Glaessel, J. Klein, M.L. Knichel, L. Leardini, D. Lohner, X.G. Lu, K. Oyama, Y. Pachmayer, K. Reygers, R. Schicker, J. Stachel, J. Stiller, M.A. Voelkl, B. Windelband, M. Winn, A. Zimmermann [und 956 weitere Personen] | ||
| 500 | |a Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt | ||
| 500 | |a Gesehen am 19.07.2021 | ||
| 520 | |a We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p−Pb collisions at √sNN=5.02TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (Npart) or the number of nucleon-nucleon binary collisions (Ncoll) are described. We show that, in contrast to Pb-Pb collisions, in p−Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the Npart dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-pT the p−Pb spectra are found to be consistent with the pp spectra scaled by Ncoll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p−Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data. | ||
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