Measurement of the azimuthal anisotropy of charged-particle production in $Xe+Xe$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector - INSPIRE

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Measurement of the azimuthal anisotropy of charged-particle production in $Xe+Xe$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector

ATLAS

Collaboration

Nov 12, 2019

35 pages

Published in:

Phys.Rev.C 101 (2020) 2, 024906

Published: Feb 11, 2020

e-Print:

1911.04812 [nucl-ex]

DOI:

10.1103/PhysRevC.101.024906 (publication)

Report number:

CERN-EP-2019-227

Experiments:

CERN-LHC-ATLAS

View in:

reference search62 citations

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Abstract: (APS)

This paper describes the measurements of flow harmonics v2–v6 in 3μb−1 of Xe+Xe collisions at sNN=5.44 TeV performed using the ATLAS detector at the Large Hadron Collider (LHC). Measurements of the centrality, multiplicity, and pT dependence of the vn obtained using two-particle correlations and the scalar product technique are presented. The measurements are also performed using a template-fit procedure, which was developed to remove nonflow correlations in small collision systems. This nonflow removal is shown to have a significant influence on the measured vn at high pT, especially in peripheral events. Comparisons of the measured vn with measurements in Pb+Pb collisions and p+Pb collisions at sNN=5.02 TeV are also presented. The vn values in Xe+Xe collisions are observed to be larger than those in Pb+Pb collisions for n=2, 3, and 4 in the most central events. However, with decreasing centrality or increasing harmonic order n, the vn values in Xe+Xe collisions become smaller than those in Pb+Pb collisions. The vn in Xe+Xe and Pb+Pb collisions are also compared as a function of the mean number of participating nucleons, 〈Npart〉, and the measured charged-particle multiplicity in the detector. The v3 values in Xe+Xe and Pb+Pb collisions are observed to be similar at the same 〈Npart〉 or multiplicity, but the other harmonics are significantly different. The ratios of the measured vn in Xe+Xe and Pb+Pb collisions, as a function of centrality, are also compared to theoretical calculations.

Note:

21 figures, 1 table. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-03/

Relativistic Nuclear Collisions
charged particle: multiplicity: measured
nucleus nucleus: scattering
charged particle: production
correlation: two-particle
angular distribution: anisotropy
heavy ion: scattering
ATLAS
CERN LHC Coll
peripheral

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