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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Heavy-Ion Collisions and QCD Phases VI
HK 28.3: Vortrag
Mittwoch, 22. März 2023, 14:45–15:00, SCH/A315
Global angular momentum generation in heavy-ion reactions within a hadronic transport approach — •Nils Saß1, Oscar Garcia-Montero1,2, Marco Müller1, and Hannah Elfner1,3,4 — 1Goethe University Frankfurt — 2University Bielefeld — 3GSI — 4FIAS
In 2017, the STAR collaboration at the Relativistic Heavy Ion Collider (RHIC) has measured finite global spin polarization of Λ hyperons. This measurement revealed a high angular momentum of the heavy ions and provided experimental evidence for vorticity in the quark-gluon plasma for the first time. In order to investigate the underlying mechanisms, a dynamic description of the transfer of angular momentum is required. In this work, the microscopic non-equilibrium transport approach SMASH is applied to study the generation of global angular momentum by the interaction of two nuclei. As SMASH provides access to the whole phase-space evolution of every particle at any given time, it allows to assess the fraction of angular momentum generated in the fireball by all participants. We confirm the previous modeling by Becattini within a geometric Glauber model approach, which found that the angular momentum transfer reaches a unique maximum in mid-central Au-Au collisions during time evolution. Even though angular momentum is not conserved locally in the transport approach a priori, we identify the contributions to the conservation violation and propose optimal setups for different energy regimes that recover conservation, based upon the test particle method and the treatment of Fermi motion.