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Charged-particle multiplicities in pp interactions at √s=900 GeV measured with the ATLAS detector at the LHC

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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 m...

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Main Authors: Aad, Georges (Author) , Andrei, George Victor (Author) , Dietzsch, Thorsten (Author) , Hanke, Paul (Author) , Khomich, Andrei (Author) , Kluge, Eike-Erik (Author) , Kugel, Andreas (Author) , Männer, Reinhard (Author) , Meier, Karlheinz (Author) , Müller, Felix (Author) , Poddar, Sahill (Author) , Radescu, Voica (Author) , Schätzel, Sebastian (Author) , Schultz-Coulon, Hans-Christian (Author) , Stamen, Rainer (Author) , Wessels, Martin (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 27 March 2010
In: Physics letters
Year: 2010, Volume: 688, Issue: 1, Pages: 21-42
ISSN:1873-2445
DOI:10.1016/j.physletb.2010.03.064
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2010.03.064
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269310003989
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Author Notes:ATLAS Collaboration*
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Summary: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.
Item Description:*ATLAS Collaboration: G. Aad, V. Andrei, T.A. Dietzsch, P. Hanke, A. Khomich, E.-E. Kluge, A. Kugel, R. Maenner, K. Meier, F. Mueller, S. Poddar, V. Radescu, S. Schaetzel, H.-C. Schultz-Coulon, R. Stamen, M. Wessels [und 3206 weitere Personen]
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Physical Description:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2010.03.064

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