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Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC
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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2011 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 13, 053033- p.Article in journal (Refereed) Published
Abstract [en]

Measurements are presented from proton-proton collisions at centre-of-mass energies of root s = 0.9, 2.36 and 7 TeV recorded with the ATLAS detector at the LHC. Events were collected using a single-arm minimum-bias trigger. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are measured. Measurements in different regions of phase space are shown, providing diffraction-reduced measurements as well as more inclusive ones. The observed distributions are corrected to well-defined phase-space regions, using model-independent corrections. The results are compared to each other and to various Monte Carlo (MC) models, including a new AMBT1 pythia6 tune. In all the kinematic regions considered, the particle multiplicities are higher than predicted by the MC models. The central charged-particle multiplicity per event and unit of pseudorapidity, for tracks with p(T) > 100 MeV, is measured to be 3.483 +/- 0.009 (stat) +/- 0.106 (syst) at root s = 0.9 TeV and 5.630 +/- 0.003 (stat) +/- 0.169 (syst) at root s = 7 TeV.

Place, publisher, year, edition, pages
2011. Vol. 13, 053033- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-156151DOI: 10.1088/1367-2630/13/5/053033ISI: 000292002100003OAI: oai:DiVA.org:uu-156151DiVA: diva2:430800
Note
3036 more authors, from The ATLAS CollaborationAvailable from: 2011-07-12 Created: 2011-07-12 Last updated: 2017-12-11Bibliographically approved

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