Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 68, Issue 3-4, Pages 345-354Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-010-1350-2
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Funding
- Lisbon and Swiss Fonds Kidagan, Armenia
- Conselho Nacional de Desenvolvimento Cientfico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Science and Technology Facilities Council [GRIDPP] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969966] Funding Source: National Science Foundation
- STFC [GRIDPP] Funding Source: UKRI
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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 root s = 7 TeV, were measured in the central pseudorapidity region vertical bar eta vertical bar < 1. Comparisons are made with previous measurements at root s = 0.9 TeV and 2.36 TeV. At root s = 7 TeV, for events with at least one charged particle in |eta vertical bar| < 1, we obtain dN(ch)/d eta = 6.01 +/- 0.01(stat.)(-0.12)(+0.20) (syst.). This corresponds to an increase of 57.6%+/-0.4%(stat.)(-1.8%)(+3.6) (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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