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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Heavy-Ion Collisions and QCD Phases I
HK 8.5: Talk
Monday, March 11, 2024, 18:00–18:15, HBR 62: EG 03
Charmonia production and dissociation within microscopic Langevin simulations — •Naomi Oei1, Juan Torres-Rincon2, Hendrik van Hees1, and Carsten Greiner1 — 1Goethe University, Frankfurt, Germany — 2Universitat de Barcelona, Barcelona, Spain
The investigation of heavy quarkonia can give insight into processes that occur during the evolution of the quark-gluon plasma and therefore allows conclusions about the properties of the medium. One advantage of theoretical approaches is that heavy quarks can be treated non-relativistically due to their large masses. We choose a classical model to describe charm and anticharm quarks as Brownian particles in the background medium of light quarks and gluons. Their motion and the interaction with the medium are based on a Fokker-Planck equation, which can be realized with Langevin simulations, quantifying how position and momentum of the quarks change due to random kicks from the medium. The heavy quarks interact over a Coulomb-like potential to form bound states, which can later dissociate again due to interactions with the medium. Therefore dissociation and regeneration of charmonium states can be described. The medium evolution is parametrized by a transversally expanding, boost invariant fireball. Box simulations at fixed temperature and volume are used to verify that the system reaches the expected thermal distribution in the equilibrium limit and to test bound state properties. Within the fireball model, the initial momentum distribution of the pairs results from the PYTHIA event-generator and the elliptic flow of charm and anticharm quarks as well as of charmonia is studied at RHIC and at LHC energy.
Keywords: Heavy Quarks; Langevin; Charmonia