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Scientific article
Open access
English

Measurement of charged-particle spectra in Pb+Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV with the ATLAS detector at the LHC

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 1509, p. 050-101
Collection
  • Open Access - SCOAP3
Publication date2015
Abstract

Charged-particle spectra obtained in Pb+Pb interactions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV and pp interactions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV 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 (| η | < 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 η . 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 | η | dependence over the whole transverse momentum range in all centrality classes.

Keywords
  • QCD
  • Heavy Ions
Citation (ISO format)
ATLAS Collaboration. Measurement of charged-particle spectra in Pb+Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV with the ATLAS detector at the LHC. In: The journal of high energy physics, 2015, vol. 1509, p. 050–101. doi: 10.1007/JHEP09(2015)050
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Article (Published version)
Identifiers
ISSN of the journal1029-8479
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Creation10/01/2015 10:01:11 AM
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