Speaker
Description
Measurements of azimuthal anisotropic flow provide valuable information on the properties of the quark-gluon plasma created in relativistic collisions of heavy ions. In addition, strong fluctuations of the anisotropic flow allow for an efficient selection of the events corresponding to a specific initial geometry. This selection technique, Event Shape Engineering, has been used to measure the elliptic and triangular flow of inclusive and identified particles ($\pi$, K, p, ${\rm K}^{\rm 0}_{\rm S}$, $\Lambda$, $\Xi$) in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded by the ALICE detector. The measurements are reported for a wide range of particle transverse momenta, $p_{\rm T}$, within the pseudorapidity region $|\eta|<0.8$. The effect of the event-shape selection is within uncertainties independent of particle species up to $p_{\rm T} \sim 8$ GeV/$c$, and the origin of this observation is discussed. Strong constraints on the initial conditions of a collision and hydrodynamic medium response are placed comparing these results to those from Xe--Xe collisions at $\sqrt{s_{\rm NN}} = 5.44$ TeV.
