Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Heavy-Ion Collisions and QCD Phases XIII
HK 65.5: Talk
Thursday, March 31, 2022, 17:00–17:15, HK-H1
Elliptic flow of pions, kaons and protons relative to the specator plane measured with ALICE at the LHC — •Michael Rudolf Ciupek1,2, Lukas Kreis1,2, and Ilya Selyuzhenkov2 for the ALICE collaboration — 1Physikalisches Institut, Heidelberg, Deutschland — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Deutschland
In relativistic heavy-ion collisions, the shape of the initial energy density in the overlap region of the colliding nuclei is asymmetric and fluctuates. Due to interactions, these are transferred to the momentum distribution of particles in the final state which is quantified by the flow coefficients vn. Thermodynamic expansion of the quark-gluon plasma (QGP) results in a specific particle mass dependence of the vn coefficients as a function of the transverse momentum. The measurements of the vn relative to the spectator plane is of special interest, since the spectators decouple very early in the collision. Comparison of the vn measured relative to the participant and that wrt. the spectator planes with the corresponding eccentricities allow constraining the initial state models. The particle type (mass) dependence of these differences is sensitive to the viscous effects in the QGP expansion.
In this talk, the ALICE measurements of the v2 for pions, kaons, and protons with respect to the spectator plane in Pb-Pb collisions at √sNN = 2.76 and 5.02 TeV are presented. Results are compared with v2 extracted from two and four-particle cumulants. The spectator plane is reconstructed using the ALICE Zero Degree Calorimeters. The particle identification is performed using a Bayesian approach.