Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 7 TeV with ALICE at LHC
Publication date
2010
Authors
Aamodt, K.
Chojnacki, M.
Christakoglou, P.
de Rooij, R. S.
Grelli, A.
Ivan, C.G.
Kamermans, Rene
Mischke, A.
Nooren, G
Peitzmann, T.
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Abstract
The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy sqrt(s) = 7 TeV, were measured in the central pseudorapidity region |eta| <1. Comparisons are made with previous measurements at sqrt(s) = 0.9 TeV and 2.36 TeV. At sqrt(s) = 7 TeV, for events with at least one charged particle in |eta| <1, we obtain dNch/deta = 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
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Aamodt, K, Chojnacki, M, Christakoglou, P, de Rooij, R S, Grelli, A, Ivan, C G, Kamermans, R, Mischke, A, Nooren, G J L, Peitzmann, T, Simili, E, van Leeuwen, M & Verweij, M 2010, 'Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 7 TeV with ALICE at LHC', European physical journal. C, particles and fields, vol. 68, no. 3-4, pp. 345-354. https://doi.org/10.1140/epjc/s10052-010-1350-2