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Charged-Particle Multiplicities in pp Interactions at $\sqrt{s}=900$ GeV Measured with the ATLAS Detector at the LHC
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Systemfysik)
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
2010 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 688, no 1, 21-42 p.Article in journal (Refereed) Published
Abstract [en]

The first measurements from proton–proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range |η|<2.5 and pT>500 MeV. The measurements are compared to Monte Carlo models of proton–proton collisions and to results from other experiments at the same centre-of-mass energy. The charged-particle multiplicity per event and unit of pseudorapidity at η=0 is measured to be 1.333±0.003(stat.)±0.040(syst.), which is 5–15% higher than the Monte Carlo models predict

Place, publisher, year, edition, pages
2010. Vol. 688, no 1, 21-42 p.
National Category
Subatomic Physics
Physics
Identifiers
ISI: 000286150500001OAI: oai:DiVA.org:su-45799DiVA: diva2:369763
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Publikationen har totalt 3221 författare, G. Aad et al.

Available from: 2010-11-11 Created: 2010-11-11 Last updated: 2013-03-20Bibliographically approved

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Åsman, BarbroBohm, ChristianClément, ChristopheEriksson, DanielGellerstedt, KarlHellman, StenHidvégi, AttilaHolmgren, Sven-OlofJohansen, MarianneJohansson, ErikJon-And, KerstinMilstead, DavidMoa, TorbjörnNordkvist, BjörnOhm, ChristianSelldén, BjörnSilverstein, SamuelSjölin, JörgenTylmad, MajaYang, Zhaoyu
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Physics Letters B
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Subatomic Physics