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This paper describes the measurements of flow harmonics $v_2$-$v_6$ in 3$\mu\mathrm{b}^{-1}$ of Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeVperformed using the ATLAS detector at the LHC. Measurements of the centrality,multiplicity and $p_{\mathrm{T}}$ dependence of the $v_n$ obtained usingtwo-particle correlations and the scalar product technique are presented. Themeasurements are also performed using a template-fit procedure, which wasdeveloped to remove non-flow correlations in small collision systems. Thisnon-flow removal is shown to have a significant influence on the measured $v_n$at high $p_{\mathrm{T}}$, especially in peripheral events. Comparisons of themeasured $v_n$ with measurements in Pb+Pb collisions and $p$+Pb collisions at$\sqrt{s_{\mathrm{NN}}}=5.02$ TeV are also presented. The $v_n$ values in Xe+Xecollisions 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 orincreasing harmonic order $n$, the $v_n$ values in Xe+Xe collisions becomesmaller than those in Pb+Pb collisions. The $v_n$ in Xe+Xe and Pb+Pb collisionsare also compared as a function of the mean number of participating nucleons,$\langle N_\text{part} \rangle$, and the measured charged-particle multiplicityin the detector. The $v_3$ values in Xe+Xe and Pb+Pb collisions are observed tobe similar at the same $\langle N_\text{part}\rangle$ or multiplicity, but theother harmonics are significantly different. Comparisons of the $v_n$measurements with theoretical calculations are also made.

physical review. c

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