Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Heavy-Ion Collisions and QCD Phases III

HK 12.5: Talk

Monday, March 28, 2022, 17:15–17:30, HK-H1

Hydrodynamic approach to heavy-quark diffusion in the quark-gluon plasma — •Federica Capellino^1,2, Andrea Beraudo³, Andrea Dubla², Stefan Floerchinger⁴, Silvia Masciocchi^1,2, Jan M. Pawlowski⁴, and Ilya Selyuzhenkov² — ¹Physikalisches Institut Heidelberg, Heidelberg, Germany — ²GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — ³INFN Sezione di Torino, Torino, Italy — ⁴Institut für Theoretische Physik, Heidelberg, Germany

In this work, a new hydrodynamic approach to the transport of heavy quarks in the quark-gluon plasma (QGP) is presented. We exploit the conservation of the number of heavy quark-antiquark pairs within the evolution of the QGP to construct causal second-order hydrodynamic equations of motion. The hydrodynamic transport coefficients associated with the heavy-quark diffusion current are then compared with the momentum-diffusion coefficients obtained in transport theory (Fokker-Planck equation). By investigating the relation between the two approaches, we provide new insights concerning the level of local thermalization of charm and bottom quarks inside the expanding QGP. Our results show that a fluid dynamic description of diffusion is feasible for charm quarks. In particular, in Bjorken flow the hydrodynamization time of charm quarks is in general short compared to the typical expansion time of the QGP, justifying a fluid description of charm diffusion. This work is funded via the DFG ISOQUANT Collaborative Research Center (SFB 1225).