München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Heavy-Ion Collisions and QCD Phases VIII

HK 41.3: Talk

Wednesday, March 20, 2019, 17:15–17:30, HS 15

Probing initial state fluctuations by the directed flow of spectators with ALICE at the LHC — •Lukas Kreis for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg

Particles produced in relativistic heavy-ion collisions show azimuthally anisotropic transverse momentum distributions. They result from the initial spatial distributions of participant and spectator nucleons, which fluctuate from event to event, combined with a rapid transverse expansion. The interplay between the initial momentum transfer to spectator nucleons and the spatial profile of the energy density in the nuclei overlap region is reflected in the relation between anisotropies present in the spectator and participant region.
Previous measurements by ALICE at the LHC revealed a non-zero rapidity-even and odd directed flow and a weak correlation between participant and spectator symmetry planes. In this talk, the correlation of flow magnitude of the spectators and produced particles in Pb-Pb collisions recorded by ALICE is studied using the event-shape-engineering method.