Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

Understand

We extend the Parton-Hadron-String Dynamics (PHSD) transport approach in the partonic sector by explicitly calculating the total and differential partonic scattering cross sections as a function of temperature $T$ and baryon chemical potential $\mu_B$ on the basis of the effective propagators and couplings from the Dynamical QuasiParticle Model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature $T_c$ from lattice QCD.

• The ratio of shear viscosity $\eta$ over entropy density $s$, i.e.
• $\eta/s$, is evaluated using the collisional widths and compared to lQCD calculations for $\mu_B$ = 0 as well.
• We find only a very modest change of $\eta/s$ with the baryon chemical $\mu_B$.