Strangeness production within Parton-Hadron-String Dynamics (PHSD)

Abstract

The Parton-Hadron-String Dynamics (PHSD) transport approach consistently simulates the full evolution of a relativistic heavy-ion collision from the initial hard scatterings string formation through the dynamical deconfinement phase transition to the quark gluon plasma (QGP), to the hadronization and to subsequent interactions in the hadronic phase. The transport theoretical description of quarks and gluons is based on a dynamical quasiparticle model for partons matched to reproduce recent lattice QCD results in thermodynamic equilibrium. The transition from partonic to hadronic degrees of freedom is described by covariant transition rates for the fusion of quark-antiquark pairs or three quarks (antiquarks). Studying Pb+Pb reactions from 40 to 158 A GeV, we find that at most 40% of the collision energy is stored in the dynamics of the partons. This implies that a large fraction of non-partonic, i.e. hadronic or string-like matter, which can be viewed as a hadronic corona, is present in these reactions, thus neither hadronic nor purely partonic models can be employed to extract physical conclusions in comparing model results with data. On the other hand, comparing the PHSD results to those of the Hadron-String Dynamics (HSD) approach without the phase transition to QGP, we observe that the existence of the partonic phase has a sizeable influence on the transverse mass distribution of final kaons due to the repulsive partonic mean fields and initial partonic scattering. Furthermore, we find a significant effect of the QGP on the production of multi-strange antibaryons due to a slightly enhanced s+sbar pair production in the partonic phase from massive time-like gluon decay and to a more abundant formation of strange antibaryons in the hadronization process.

Talk given at the International Conference Strangeness in Quark Matter 2009 (SQM 09)

References in corpus (10)

• Parton-Hadron-String Dynamics: an off-shell transport approach for relativistic energies
• Parton transport and hadronization from the dynamical quasiparticle point of view
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Dynamical quasiparticles properties and effective interactions in the sQGP
• Enhancement of hyperon production at central rapidity in 158 A GeV/c Pb-Pb collisions
• QCD thermodynamics and confinement from a dynamical quasiparticle point of view
• Strangeness production from SPS to LHC
• Open and hidden charm in proton-nucleus and heavy-ion collisions
• System-size dependence of Lambda and Xi production in nucleus--nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron
• Dileptons from the strongly-interacting Quark-Gluon Plasma within the Parton-Hadron-String-Dynamics (PHSD) approach

Cited by in corpus (6)

• Hydrodynamic modeling of deconfinement phase transition in heavy-ion collisions at NICA-FAIR energies
• Core-corona separation in the UrQMD hybrid model
• Dilepton production in the strongly interacting quark-gluon plasma
• The effect of flow on Hadronic Spectra in an Excluded-Volume Model
• Multi-strange and charmed hadrons: A novel probe for the QCD equation of state at high baryon densities
• Use of the Meta-analysis and Kolmogorov Criteria in the Finding of Singularities of a Nuclear Matter Created in Ultra Relativistic Nuclear Collisions