Charged-particle multiplicities in pp interactions at √s=900 GeV measured with the ATLAS detector at the LHC
Author(s)
Coco, R.; Osborne, Louis S.; Taylor, Frank E.
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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.
Date issued
2010-03Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physics Letters B
Publisher
Elsevier B.V.
Citation
Aad, G. et al. “Charged-particle Multiplicities in Pp Interactions at √s=900 GeV Measured with the ATLAS Detector at the LHC.” Physics Letters B 688.1 (2010): 21–42. Web. © 2010 Elsevier B.V.
Version: Final published version
ISSN
0370-2693