# Measurement of the azimuthal anisotropy of charged-particle production in Xe+Xe collisions at √sNN = 5.44 TeV with the ATLAS detector

ATLAS

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## Abstract

This paper describes the measurements of flow harmonics υ2–υ6 in 3 µb−1 of Xe+Xe collisions at √sNN = 5.44 TeV performed using the ATLAS detector at the LHC. Measurements of the centrality, multiplicity and pT dependence of the υn 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 non-flow correlations in small collision systems. This non-flow removal is shown to have a significant influence on the measured υn at high pT, especially in peripheral events. Comparisons of the measured υn with measurements in Pb+Pb collisions and p+Pb collisions at √sNN = 5.02 TeV are also presented. The υn 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 υn values in Xe+Xe collisions become smaller than those in Pb+Pb collisions. The υn 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 υ3 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. Comparisons of the υn measurements with theoretical calculations are also made.

Original language English (US) Unknown Journal Published - Nov 12 2019

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