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" Charged-particle multiplicity measurement in proton-proton collisions at √s 0.9 and 2.36 TeV with ALICE at LHC "
Aamodt, K; Abel, N; Abeysekara, U; Abrahantes Quintana, A; Abramyan, A; Adamová, D; Aggarwal, MM; Aglieri Rinella, G; Agocs, AG; Aguilar Salazar, S; Ahammed, Z; Ahmad, A; Ahmad, N; Ahn, SU; Akimoto, R; Akindinov, A; Aleksandrov, D; Alessandro, B; Alfaro Molina, R; Alici, A; Almaráz Aviña, E; Alme, J; Alt, T; et al.
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AL
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| Record Number
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907385
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LA9zm1m5mn
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| Title & Author
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Charged-particle multiplicity measurement in proton-proton collisions at √s 0.9 and 2.36 TeV with ALICE at LHC [Article]\ Aamodt, K; Abel, N; Abeysekara, U; Abrahantes Quintana, A; Abramyan, A; Adamová, D; Aggarwal, MM; Aglieri Rinella, G; Agocs, AG; Aguilar Salazar, S; Ahammed, Z; Ahmad, A; Ahmad, N; Ahn, SU; Akimoto, R; Akindinov, A; Aleksandrov, D; Alessandro, B; Alfaro Molina, R; Alici, A; Almaráz Aviña, E; Alme, J; Alt, T; et al.
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2010
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Lawrence Berkeley National Laboratory
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| Abstract
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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 {pipe}η{pipe}<1.4. In the central region ({pipe}η{pipe}<0.5), at 0.9 TeV, we measure charged-particle pseudorapidity density dNch/dη= 3.02 ± 0.01 (stat.)-0.05+0.08(syst.) for inelastic interactions, and dNch/dη = 3.58 ± 0.01 (stat.)-0.12+0.12(syst.) for non-single-diffractive interactions. At 2.36 TeV, we find dNch/dη = 3.77 ± 0.01 (stat.)-0.12+0.25(syst.) for inelastic, and dNch/dη = 4.43 ± 0.01(stat.)-0.12+0.17(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.)-2.8+5.7(syst.) for inelastic and 23.7% ± 0.5%(stat.)-1.1+4.6% 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. © 2010 CERN for the benefit of the ALICE collaboration.
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