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HK: Fachverband Physik der Hadronen und Kerne
HK 5: Heavy-Ion Collisions and QCD Phases I
HK 5.3: Talk
Monday, March 20, 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 Ciupek1,2, Lukas Kreis1,2, 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 vn. The 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 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 √sNN = 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.