SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Heavy-Ion Collisions and QCD Phases I

HK 5.3: Vortrag

Montag, 20. März 2023, 17:00–17:15, SCH/A216

Elliptic flow of pions, kaons and protons relative to the spectator plane measured with ALICE at the LHC — •Michael Rudolf Ciupek^1,2, Lukas Kreis^1,2, and Ilya Selyuzhenkov² for the ALICE Germany 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 fluctuations are transferred to the momentum distribution of particles in the final state which is quantified by the flow coefficients v_n. The 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 the spectator plane with the corresponding eccentricities allow constraining the initial state models. The particle-type dependence of these differences is sensitive to the viscous effects in the QGP expansion.
ALICE measurements of the v₂ for pions, kaons and protons wrt. the spectator plane in Pb-Pb collisions at √s_NN = 2.76 TeV are presented. The measurement of the particle-type dependent difference between v₂ relative to spectator plane and that of four-particle cumulants extends on previously published results for charged hadrons and allow to separate effects from QGP evolution and initial state fluctuations.