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

This note describes the measurement of flow harmonics $v_2$--$v_5$ in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}$=5.44~TeV performed using the ATLAS detector at the LHC. The measurements are performed using multi-particle correlations involving 2, 4 and 6 particles and the Scalar Product technique. Measurements of the centrality and $p_{\mathrm{T}}$ dependence of the $v_n$ are presented. Comparisons of the measured $v_n$ to previous measurements for Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02~TeV are also presented. The Xe+Xe $v_n$ are observed to be larger than the Pb+Pb $v_n$ for $n$=2,3 and $4$ in the most central events, but with decreasing centrality or increasing harmonic order $n$, the Xe+Xe $v_n$ become smaller than the Pb+Pb $v_n$. The Xe+Xe and Pb+Pb comparisons are also shown as a function of the mean number of participants $\langle N_\text{part} \rangle$, and the 4-particle cumulants for higher-order harmonics -- $v_3\{4\}$ and $v_4\{4\}$ -- are found to scale better with $\langle N_\text{part}\rangle$ than with centrality. Comparisons of the $v_n$ measurements to theoretical calculations are also made.