Measurement of the azimuthal anisotropy of charged-particle production in Xe+Xe collisions at \sqrts\mathrmNN=5.44 TeV with the ATLAS detector

Franconi, Laura; Haug, Sigve; Weber, Michele; Anders, John Kenneth; Fehr, Armin; Beck, Hans Peter; Ereditato, Antonio; Miucci, Antonio; Weston, Thomas Daniel (2020). Measurement of the azimuthal anisotropy of charged-particle production in Xe+Xe collisions at \sqrts\mathrmNN=5.44 TeV with the ATLAS detector. Physical review. C - nuclear physics, 101(2) American Institute of Physics 10.1103/PhysRevC.101.024906

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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.

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