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Title: Charged-particle multiplicity measurement in proton–proton collisions at $$\sqrt{s}=0.9$$ and 2.36 TeV with ALICE at LHC

Journal Article · · European Physical Journal. C, Particles and Fields
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Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |η|<1.4. In the central region (|η|<0.5), at 0.9 TeV, we measure charged-particle pseudorapidity density dNch/dη= 3.02 ± 0.01 (stat.)$$ +0.08\atop{-0.05} $$(syst.) for inelastic interactions, and dNch/dη = 3.58 ± 0.01 (stat.)$$ +0.12\atop{-0.12} $$(syst.) for non-single-diffractive interactions. At 2.36 TeV, we find dNch/dη = 3.77 ± 0.01 (stat.)$$ +0.25\atop{-0.12} $$(syst.) for inelastic, and dNch/dη = 4.43 ± 0.01(stat.)$$ +0.17\atop{-0.12} $$(syst.) for non-single-diffractive collisions. The relative increase in charged-particle multiplicity from the lower to higher energy is 24.7% ± 0.5%(stat.)$$ +5.7\atop{-2.8} $$%(syst.) for inelastic and 23.7% ± 0.5%(stat.)$$ +4.6\atop{-1.1} $$% 1.1%(syst.) for non-single-diffractive interactions. This increase is consistent with that reported by the CMS collaboration for non-single-diffractive events and larger than that found by a number of commonly used models. The multiplicity distribution was measured in different pseudorapidity intervals and studied in terms of KNO variables at both energies. The results are compared to proton-antiproton data and to model predictions.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); State of Ohio; State of Texas; USDOE Office of Science (SC)
Contributing Organization:
The ALICE Collaboration
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
988260
Journal Information:
European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 1-2 Vol. 68; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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