Anisotropic flow in Xe-Xe collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.44$ TeV

Abstract

The first measurements of anisotropic flow coefficients $v_{\mathrm{n}}$ for mid-rapidity charged particles in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV are presented. Comparing these measurements to those from Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, $v_2$ is found to be suppressed for mid-central collisions at the same centrality, and enhanced for central collisions. The values of $v_3$ are generally larger in Xe-Xe than in Pb-Pb at a given centrality. These observations are consistent with expectations from hydrodynamic predictions. When both $v_2$ and $v_3$ are divided by their corresponding eccentricities for a variety of initial state models, they generally scale with transverse density when comparing Xe-Xe and Pb-Pb, with some deviations observed in central Xe-Xe and Pb-Pb collisions. These results assist in placing strong constraints on both the initial state geometry and medium response for relativistic heavy-ion collisions.

23 pages, 7 captioned figures, authors from page 18, published, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4271

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