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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Heavy-Ion Collisions and QCD Phases V

HK 24.3: Vortrag

Mittwoch, 1. April 2020, 14:45–15:00, J-HS F

ALICE studies of the particle-species dependent anisotropic flow with spectators — •Michael Ciupek for the ALICE collaboration — Physikalisches Institut, Heidelberg, Deutschland — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Deutschland

In relativistic heavy-ion collisions, the initial energy density in the overlap region of the colliding nuclei is asymmetric. Due to interactions, this asymmetry is transferred to the momentum distribution of particles in the final state. The measurement of the anisotropic flow relative to the spectator plane is of special interest since the spectators decouple very early from the collision and are sensitive to the spatial shape of the initial energy density distribution.
The thermodynamic expansion of the quark-gluon plasma (QGP) results in a mass ordering of the anisotropic flow of particles as function of the transverse momentum. As such, the anisotropic flow of identified particles with respect to the spectator plane is sensitive to the three-dimensional evolution of the QGP. Additionally, the difference of the anisotropic flow of particles and anti-particles, such as protons and anti-protons, allows investigating the transport of different quantum numbers (e.g. baryon number) in the QGP.
In this talk, studies of the particle-species dependent anisotropic flow with respect to spectators in Pb-Pb collisions with ALICE are presented. The particle identification is performed using a Bayesian approach, combining the information from different detectors. The spectator plane is reconstructed with the Zero Degree Calorimeter.