Heavy-quark dynamics in a hydrodynamically evolving medium

Marlene Nahrgang,Jörg Aichelin,Pol Bernard Gossiaux,Klaus Werner

doi:10.1051/epjconf/201817104003

Abstract

In this talk we will discuss the recent advances in describing heavy-quark dynamics in the quark-gluon plasma (QGP), which evolves hydrodynamically. Special emphasis is put on the collective flow of the heavy-quarks with the medium constituents, for which we present our latest results obtained within the MC@sHQ+EPOS2 model at √s = 5 TeV.

Highlights

Hadronization: Since comparison to experimental data occurs on the level of hadronic particles, it is necessary to perform a hadronization around the transition temperature of the confinementdeconfinement phase transition
The hydrodynamical description of the space-time evolution of the quark-gluon plasma (QGP) has been very successful in reproducing various experimental data from pT -spectra to flow harmonics - albeit with different combinations of transport coefficients and initial conditions
The relativistic viscous hydrodynamical model describes the evolution of energy, momentum and charge density according to the conservation equations:

Summary

Heavy quarks as probes of the QGP medium

Especially charm and bottom, have since long been considered valuable probes for properties of the QGP. While the “standard” model of describing the space-time evolution of the bulk medium produced in heavy-ion collisions typically relies on a plasma phase that can be described by hydrodynamics, the heavy-quarks are produced in initial hard scatterings and not equilibrated with the QGP at τ0, the initial time of hydrodynamics. For both approaches, the local temperature and the velocities are obtained from a hydrodynamical evolution. In order to obtain reliable results it is important that the space-time evolution of the QGP is well tested against the ample experimental data available for the bulk observables. In the resonance recombination model a hadronization process stemming from the same underlying interaction as the heavy-quark medium interaction is realized [6, 7]. For entering the era of precision measurement, it will become important to have a good handle on the hadronic final interactions as well

Hydrodynamics and heavy quarks

Ds from lattice QCD

Ds from interaction models

Ds from model-to-data analysis

Collective flow of heavy-quarks

Summary