Transport coefficients of heavy quarks around $T_c$ at finite quark chemical potential

Abstract

The interactions of heavy quarks with the partonic environment at finite temperature $T$ and finite quark chemical potential ${\mu }_q$ are investigated in terms of transport coefficients within the Dynamical Quasi-Particle model (DQPM) designed to reproduce the lattice-QCD results (including the partonic equation of state) in thermodynamic equilibrium. These results are confronted with those of nuclear many-body calculations close to the critical temperature $T_c$. The hadronic and partonic spatial diffusion coefficients join smoothly and show a pronounced minimum around $T_c$, at ${\mu }_q=0$ as well as at finite ${\mu }_q$. Close and above $T_c$ its absolute value matches the lQCD calculations for ${\mu }_q=0$. The smooth transition of the heavy quark transport coefficients from the hadronic to the partonic medium corresponds to a cross over in line with lattice calculations, and differs substantially from perturbative QCD (pQCD) calculations which show a large discontinuity at $T_c$. This indicates that in the vicinity of $T_c$ dynamically dressed massive partons and not massless pQCD partons are the effective degrees-of-freedom in the quark-gluon plasma.

4 pages, 4 figures

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Cited by in corpus (5)

• Toward a solution to the $R_{AA}$ and $v_2$ puzzle for heavy quarks
• Dynamical collisional energy loss and transport properties of on- and off-shell heavy quarks in vacuum and in the Quark Gluon Plasma
• SU(3) Polyakov linear-sigma model: Conductivity and viscous properties of QCD matter in thermal medium
• In-medium kinetic theory of $D$ mesons and heavy-flavor transport coefficients
• Soft-hard factorization of heavy-quark transport in QCD matter at finite chemical potential