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

Fox, Harald and Borissov, Guennadi and Bouhova-Thacker, Evelina and Brodbeck, Timothy and Catmore, James and Cheatham, Sue and Chilingarov, Alexandre and Davidson, Ruth and de Mora, Lee and Henderson, Robert and Hughes, Gareth and Jones, Roger and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Ratoff, Peter and Sloan, Terence and Smizanska, Maria and Walder, James (2010) Charged-particle multiplicities in pp interactions at √s = 900 GeV measured with the ATLAS detector at the LHC. Physics Letters B, 688 (1). pp. 21-42. ISSN 0370-2693

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Additional Information:
This article is distributed under the terms of the Creative Commons Attribution License 3.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
64450
Deposited By:
Deposited On:
13 May 2013 08:46
Refereed?:
Yes
Published?:
Published
Last Modified:
06 Jun 2020 02:40