Non-linear flow modes of identified particles in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV with the ALICE detector

The non-linear flow modes, v 4,22 , v 5,32 and v 6,33 as a function of transverse momentum ( p T ) have been measured for the first time in Pb–Pb collisions at sNN=5.02TeV for identified particles, i.e. charged pions, kaons and (anti-)protons. These observables probe the contribution of the second and third initial anisotropy coefficients to the higher order flow harmonics. Interestingly, all the characteristic features observed in previous p T -differential as well as p T -integrated measurements (e.g. v 2 and v 3 ) for various particle species are present in these measurements, i.e. increase of magnitude with increasing centrality percentile, a mass ordering in the low p T region and a particle type grouping in the intermediate p T region. The results cover 0–1% (ultra-central collisions), 10–20% (mid-central collisions) and 40–50% (mid-peripheral collisions) centrality intervals and allow to test models that attempt to describe initial conditions and the mode-coupling of different harmonics.