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Measurement of charged-particle spectra in Pb plus Pb collisions at root s(NN)=2.76 TeV with the ATLAS detector at the LHC
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2829
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, 050Article in journal (Refereed) Published
Abstract [en]

Charged-particle spectra obtained in Pb+Pb interactions at root s(NN) = 2.76TeV and pp interactions at root s(NN) = 2.76TeV with the ATLAS detector at the LHC are presented, using data with integrated luminosities of 0.15 nb(-1) and 4.2 pb(-1), respectively, in a wide transverse momentum (0.5 < p(T) < 150 GeV) and pseudorapidity (vertical bar eta vertical bar < 2) range. For Pb+Pb collisions, the spectra are presented as a function of collision centrality, which is determined by the response of the forward calorimeters located on both sides of the interaction point. The nuclear modification factors R-AA and R-CP are presented in detail as a function of centrality, p(T) and eta. They show a distinct p(T)-dependence with a pronounced minimum at about 7 GeV. Above 60 GeV, R-AA is consistent with a plateau at a centrality-dependent value, within the uncertainties. The value is 0.55 +/- 0.01(stat.) +/- 0.04(syst.) in the most central collisions. The R-AA distribution is consistent with flat vertical bar eta vertical bar dependence over the whole transverse momentum range in all centrality classes.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2015. no 9, 050
Keyword [en]
Heavy Ions, QCD
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-176022DOI: 10.1007/JHEP09(2015)050ISI: 000361614600001Scopus ID: 2-s2.0-84942319371OAI: oai:DiVA.org:kth-176022DiVA: diva2:865425
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20151028

Available from: 2015-10-28 Created: 2015-10-28 Last updated: 2017-12-01Bibliographically approved

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