(Anti-)strangeness production in heavy-ion collisions

15th International Conference on Strangeness in Quark Matter

Moreau, P.^1,2 ; Li, F.^3 ; Ko, C.-M.^3 ; Cassing, W.^4 ; Bratkovskaya, E.L.^1,2

Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany^1

Institut für Theoretische Physik, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany^2

Cyclotron Institute and Department of Physics and Astronomy, Texas AandM University, College Station, United States^3

Institut für Theoretische Physik, Universität Gießen, Germany^4

关键词: Bombarding energies;    Chiral symmetry;    Exchange reaction;    Heavy ion collision;    Heavy-ion reactions;    Strangeness enhancement;    Strangeness production;    Transport modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/668/1/012072/pdf
DOI  :  10.1088/1742-6596/668/1/012072

来源: IOP

【 摘 要 】

The production and dynamics of strange and antistrange hadrons in heavy-ion reactions from √sNN≈ 3 GeV to 200 GeV is analyzed within the Parton-Hadron-String- Dynamics (PHSD) transport model. The PHSD results for strange baryon and antibaryon production are roughly consistent with the experimental data starting from upper SPS energies. Nevertheless, hadronic final state flavor-exchange reactions are important for the actual abundances, in particular at large rapidities where hadronic dynamics, parton fragmentation and string decay dominate. A striking disagreement between the PHSD results and the available data persists, however, for bombarding energies below √sNN≈ 8 GeV where the strangeness production is significantly underestimated as in earlier HSD studies. This finding implies that the strangeness enhancement seen experimentally at FAIR/NICA energies cannot be attributed to a deconfinement phase transition or crossover but probably involves the approximate restoration of chiral symmetry in the hadronic phase.