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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 applied to Pb+Pb collisions from 20 to 160 A GeVin order to explore the space-time regions of 'partonic matter'. We find thateven central collisions at the top-SPS energy of 158 A GeV show a largefraction of non-partonic, i.e. hadronic or string-like matter, which can beviewed as a hadronic corona. Furthermore, we observe that the partonic phasehas a very low impact on rapidity distributions of hadrons but a sizeableinfluence on the transverse mass distribution of final kaons due to therepulsive partonic mean fields. We also find a significant effect on theproduction of multi-strange antibaryons due to a slightly enhanced $s{\bar s}$pair production in the partonic phase from massive time-like gluon decay and alarger formation of antibaryons in the hadronization process. All differentialhadron spectra are analyzed in comparison to the data of experimentalcollaborations.

Parton-Hadron-String Dynamics: an off-shell transport approach for relativistic energies