Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 65: Heavy-Ion Collisions and QCD Phases XIII

HK 65.5: Vortrag

Donnerstag, 31. März 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 Ciupek^1,2, Lukas Kreis^1,2, 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 v_n. Thermodynamic expansion of the quark-gluon plasma (QGP) results in a specific particle mass dependence of the v_n coefficients as a function of the transverse momentum. The measurements of the v_n relative to the spectator plane is of special interest, since the spectators decouple very early in the collision. Comparison of the v_n 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 √s_NN = 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.