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Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC ATLAS Collaboration
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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2010 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 688, no 1, 21-42 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2010. Vol. 688, no 1, 21-42 p.
Keyword [en]
Charged-particle, Multiplicities, 900 GeV, ATLAS, LHC, Minimum bias
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-148520DOI: 10.1016/j.physletb.2010.03.064ISI: 000286150500001OAI: oai:DiVA.org:uu-148520DiVA: diva2:402294
Available from: 2011-03-07 Created: 2011-03-07 Last updated: 2017-12-11Bibliographically approved

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High Energy PhysicsDepartment of Physics and Astronomy
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