Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Heavy-Ion Collisions and QCD Phases II

HK 3.3: Vortrag

Montag, 28. März 2022, 14:45–15:00, HK-H2

J/Ψ formation within microscopic Langevin simulations — •Naomi Oei, Nadja Krenz, Juan Torres-Rincon, Hendrik van Hees, and Carsten Greiner — Institute for Theoretical Physics, Frankfurt am Main, Germany

We present a microscopic model to describe dissociation and recombination processes of charmonia in the quark-gluon plasma. For this we simulate the time evolution of a system with several charm-anticharm-quark pairs, in which the heavy quarks are able to interact over a Coulomb like potential. The motion of the heavy quarks and the interaction with the medium are based on a Fokker-Planck equation, which can be realized with Langevin simulations. In this approach we use a momentum-dependent drag force and include random momentum kicks due to collisions with the medium particles. Therefore, through interactions of the heavy quarks with the medium, recombination and dissociation processes are possible. We describe the evolution of the medium as a boost-invariant transversally expanding fireball. We demonstrate that the system reaches the expected thermal distribution in the equilibrium limit and bound-state properties were tested in box simulations. The initial momentum distribution of the pairs is generated using the PYTHIA event-generator and results of the model are studied at RHIC and at LHC energy. We analyze results for different numbers of charm-anticharm-pairs for two initial conditions: The charm- and anticharm-quarks are either placed randomly inside the system or are initially created as a bound state. We show first results of the elliptic flow of charm-quarks and of bound states.