Charged-particle multiplicities in pp interactions at √s=900 GeV measured with the ATLAS detector at the LHC
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Aad-2010-Charged-particle multiplicities in.pdf
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1.45 MB
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Author(s)
Coco, R.
Osborne, Louis S.
Taylor, Frank E.
Date Issued
March 2010
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2010.03.064
