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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Heavy-Ion Collisions and QCD Phases XII
HK 48.1: Vortrag
Mittwoch, 13. März 2024, 17:30–17:45, HBR 14: HS 1
Vorticity in heavy-ion collisions from a coarse-grained transport approach — •Robin Sattler1, Nils Sass1, and Hannah Elfner1,2,3,4 — 1Institute for Theoretical Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany — 3Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany — 4Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center, Campus Frankfurt, Max-von-Laue-Strasse 12, 60438 Frankfurt am Main, Germany
In 2017, the STAR collaboration at the Relativistic Heavy Ion Collider (RHIC) measured the polarization of Λ (and Λ) hyperons and deduced an estimate for the vorticity in heavy ion collisions (HICs). Their findings suggest that the fluid produced in HICs is a highly vortical system due to the large deposition of angular momentum in the interaction medium of non-central collisions. In this work, the vortical flow structure of HICs is examined applying the hadronic transport approach SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) within a coarse-grained framework. The thermal vorticity in non-central Au+Au collisions is calculated. In order to compare the results to the experimental data of the STAR collaboration, the polarization of the Λ hyperons is determined on the freeze-out hypersurface. In addition, the results are compared to a similar study within the UrQMD (Ultra-relativistic Quantum Molecular Dynamics) approach.
Keywords: vorticity; transport; polarization; hyperon; lambda