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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.
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http://hal.in2p3.fr/in2p3-01017187
Contributor : Sylvie Flores <>
Submitted on : Wednesday, July 2, 2014 - 7:44:30 AM
Last modification on : Thursday, January 30, 2020 - 3:30:33 PM

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H. Berrehrah, Pol-Bernard Gossiaux, Jörg Aichelin, W. Cassing, J. M. Torres-Rincon, et al.. Transport coefficients of heavy quarks around $T_c$ at finite quark chemical potential. Physical Review C, American Physical Society, 2014, 90 (5), pp.4. ⟨10.1103/PhysRevC.90.051901⟩. ⟨in2p3-01017187⟩

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