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Title: Charged-particle multiplicity measurement in proton–proton collisions at $$\sqrt{s}=7$$ TeV with ALICE at LHC

Journal Article · · European Physical Journal. C, Particles and Fields
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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 $$\sqrt{s}=7$$ TeV, were measured in the central pseudorapidity region |η| < 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 |η| < 1, we obtain dNch/dη = 6.01 ± 0.01(stat.)$$\mathbb +0.20\atop{-0.12} $$(syst.). This corresponds to an increase of 57.6% ± 0.4%(stat.)$$\mathbb +3.6\atop{-1.8} $$(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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); State of Texas; State of Ohio
Contributing Organization:
The ALICE Collaboration
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1511322
Alternate ID(s):
OSTI ID: 988259
Journal Information:
European Physical Journal. C, Particles and Fields, Vol. 68, Issue 3-4; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 193 works
Citation information provided by
Web of Science

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Figures / Tables (4)