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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Heavy-Ion Collisions and QCD Phases VI

HK 32.3: Vortrag

Dienstag, 12. März 2024, 18:15–18:30, HBR 62: EG 03

Heavy-quark distribution function via a Maximum Entropy approach — •Federica Capellino¹, Andrea Dubla², Stefan Floerchinger³, Eduardo Grossi⁴, Andreas Kirchner⁵, and Silvia Masciocchi^1,2 — ¹Physikalisches Institut Heidelberg, Heidelberg, Germany — ²GSI, Darmstadt, Germany — ³Theoretisch-Physikalisches Institut Universität Jena, Jena, Germany — ⁴Università di Firenze, Sesto Fiorentino, Italy — ⁵Institut für Theoretische Physik Heidelberg, Heidelberg, Germany

Heavy quarks (i.e. charm and beauty) are powerful tools to characterize the quark-gluon plasma (QGP) produced in heavy-ion collisions. They are initially produced out of kinetic equilibrium via hard partonic scattering processes. In this work, we first show that a fluid-dynamic approach can be applied to study the dynamics of charm quarks in the QGP and describe their relaxation towards kinetic equilibrium. Furthermore, we propose a description of the heavy-quark distribution function out of equilibrium via a Maximum Entropy method. This approach relies on the assumption that the distribution function maximizes a functional of the entropy current in any reference frame and does not require the distribution function to be close to local kinetic equilibrium. This description can be used to construct the momentum distribution of heavy-flavor hadrons at freeze-out, including consistently the impact of out-of-equilibrium corrections on the freeze-out surface.

This work is funded via the DFG ISOQUANT Collaborative Research Center (SFB 1225).

Keywords: heavy quarks; out-of-equilibrium distribution function; maximum entropy; fluid dynamics