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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 543353.0, MPI für Physik / MPI für Physik
Charged-particle multiplicities in pp interactions at sqrt(s) = 900 GeV measured with the ATLAS detector at the LHC
Authors:The ATLAS Collaboration; Aad et al, G.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Physics Letters B
Journal Abbrev.:Phys.Lett.B
Issue / Number:688
Start Page:21
End Page:42
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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
|&#951;| < 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 &#951; = 0 is measured to be 1.333 ± 0.003(stat.) ±
0.040(syst.), which is 5–15% higher than the Monte Carlo models predict
Classification / Thesaurus:ATLAS
Comment of the Author/Creator:40 pages (pages 24-40 appendix with ATLAS collaboration author list), 4 figures. The data points are in the HEP-data database at: href{http://hepdata.cedar.ac.uk/View/8591806}{this http URL}
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2010-60
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:doi:10.1016/j.physletb.2010.03.064
URL:http://arXiv.org/abs/arxiv:1003.3124
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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