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

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

ATLAS

Collaboration

Apr 16, 2015

36 pages

Published in:

JHEP 09 (2015) 050

Published: Sep 9, 2015

e-Print:

1504.04337 [hep-ex]

DOI:

10.1007/JHEP09(2015)050

Report number:

CERN-PH-EP-2015-032

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Springer)

Charged-particle spectra obtained in Pb+Pb interactions at

\sqrt{s_{\mathrm{NN}}}=2.76

TeV and pp interactions at

\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.

Note:

36 pages plus author list + cover pages (57 pages total), 18 figures, 4 tables, published in JHEP09(2015)050. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-03/

QCD
Heavy Ions
heavy ion: scattering
lead
p p: scattering
charged particle: spectrum
charged particle: direct production
vertex: primary
transverse momentum dependence
CERN LHC Coll

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