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The dynamics of partons, hadrons and strings in relativistic nucleus-nucleuscollisions is analyzed within the novel Parton-Hadron-String Dynamics (PHSD)transport approach, which is based on a dynamical quasiparticle model forpartons (DQPM) matched to reproduce recent lattice-QCD results - including thepartonic equation of state - in thermodynamic equilibrium. Scalar- andvector-interaction densities are extracted from the DQPM as well as effectivescalar- and vector-mean fields for the partons. The transition from partonic tohadronic degrees of freedom is described by covariant transition rates for thefusion of quark-antiquark pairs or three quarks (antiquarks), respectively,obeying flavor current-conservation, color neutrality as well asenergy-momentum conservation. Since the dynamical quarks and antiquarks becomevery massive close to the phase transition, the formed resonant 'pre-hadronic'color-dipole states ($q\bar{q}$ or $qqq$) are of high invariant mass, too, andsequentially decay to the groundstate meson and baryon octets increasing thetotal entropy. When applying the PHSD approach to Pb+Pb colllisions at 158A$\cdot$GeV we find a significant effect of the partonic phase on theproduction of multi-strange antibaryons due to a slightly enhanced $s{\bar s}$pair production from massive time-like gluon decay and a larger formation ofantibaryons in the hadronization process.

Covariant transport approach for strongly interacting partonic systems