Measurement of higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at $\sqrt{{s}_{NN}}=$ 2.76 TeV

The latest ALICE results on the centrality and transverse momentum dependence of v (2), v (3), v (4) and v (5) for π(±) , K (±) and p() in Pb–Pb collisions at = 2.76 TeV are presented. The flow coefficients exhibit a clear mass ordering for p (T) < 2.5 GeV/c for all harmonics. For transverse momentum values larger than about 3 GeV/c, mesons exhibit distinctively lower flow values compared to baryons, suggesting that coalescence might be the relevant particle production mechanism in this region. The experimental data for p (T) < 2.5 GeV/c are described fairly well by the hydrodynamical model iEBE-VISHNU, which models the hydrodynamical expansion of the fireball using a value of η/s = 0.08, coupled to a hadronic cascade model (UrQMD). Finally, A Multi-Phase Transition Model (AMPT) highlights the significant contribution of the hadronic rescattering phase and of coalescence as the dominant particle production mechanism to the mass ordering at low p (T) and the baryon-meson grouping at intermediate p (T), respectively.