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Charged-particle multiplicity measurement in proton-proton collisions at √s=7 TeV with ALICE at LHC

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The pseudorapidity density and multiplicity distribution of charged particles produced in proton–proton collisions at the LHC, at a centre-of-mass energy s√=7 TeV, were measured in the central pseudorapidity region |η|<1. Comparisons are made with previous measurements at s√=0.9 TeV and 2.36 TeV....

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Main Authors: Aamodt, Kenneth (Author) , Angelov, Venelin (Author) , Busch, Oliver (Author) , Glässel, Peter (Author) , Grajcarek, Robert (Author) , Herrmann, Norbert (Author) , Klein, Jochen (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Schicker, Rainer (Author) , Schweda, Kai (Author) , Soltveit, Hans Kristian (Author) , Stachel, Johanna (Author) , Vallero, Sara (Author) , Windelband, Bernd (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 22 June 2010
In: The European physical journal. C, Particles and fields
Year: 2010, Volume: 68, Pages: 345-354
ISSN:1434-6052
DOI:10.1140/epjc/s10052-010-1350-2
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-010-1350-2
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Author Notes:The ALICE Collaboration*
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Summary:The pseudorapidity density and multiplicity distribution of charged particles produced in proton–proton collisions at the LHC, at a centre-of-mass energy s√=7 TeV, were measured in the central pseudorapidity region |η|<1. Comparisons are made with previous measurements at s√=0.9 TeV and 2.36 TeV. At s√=7 TeV, for events with at least one charged particle in |η|<1, we obtain dNch/dη=6.01±0.01(stat.)+0.20−0.12(syst.). This corresponds to an increase of 57.6%±0.4%(stat.)+3.6−1.8%(syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution.
Item Description:*The ALICE Collaboration: K. Aamodt, V. Angelov, O. Busch, P. Glässel, R. Grajcarek, N. Herrmann, J. Klein, J. Mercado Pérez, K. Oyama, Y. Pachmayer, R. Schicker, K. Schweda, H.K. Soltveit, J. Stachel, S. Vallero, B. Windelband (und sehr viele weitere Personen]
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Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-010-1350-2

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