Abstract
The multi-strange baryon and vector meson resonance production in relativistic nucleus-nucleus collisions is studied within the parton-hadron- string dynamics (PHSD) approach which incorporates explicit partonic degrees- of-freedom in terms of strongly interacting quasiparticles (quarks and gluons) in line with an equation-of-state from lattice QCD as well as the dynamical hadronization and hadronic collision dynamics in the final reaction phase. We find a significant effect of the partonic phase on the production of multi-strange antibaryons at SPS energies due to a slightly enhanced s¯ s pair production from massive time-like gluon decay and a larger formation of antibaryons in the hadronization process. We, futhermore, obtain a visible in-medium effects in the low mass dilepton sector from dynamical vector-meson spectral functions from SIS to SPS energies whereas at RHIC and LHC energies such medium ef- fects become more moderate. In the intermediate mass regime from 1.1 to 3 GeV pronounced traces of the partonic degrees of freedom are found at SPS energies which superseed the hadronic (multi-meson) channels as well as the correlated and uncorrelated semi-leptonic D-meson decays. The dilepton production from the strongly interacting quark-gluon-plasma (sQGP) becomes already visible at top SPS energies and more pronounced at RHIC and LHC energies.
Highlights
The study of resonance production in heavy-ion collisions is considered as one of the promising ways to obtain information about the different reaction stages [1]
The multi-strange baryon and vector meson resonance production in relativistic nucleus-nucleus collisions is studied within the parton-hadronstring dynamics (PHSD) approach which incorporates explicit partonic degreesof-freedom in terms of strongly interacting quasiparticles in line with an equation-of-state from lattice QCD as well as the dynamical hadronization and hadronic collision dynamics in the final reaction phase
Our study is based on the Parton-HadronString Dynamics (PHSD) transport model [9]
Summary
The study of resonance production in heavy-ion collisions is considered as one of the promising ways to obtain information about the different reaction stages [1]. On top of the previously mentioned sources, especially in the intermediate mass region, radiation from the strongly interacting Quark-Gluon-Plasma (sQGP) can give a significant signal [2] as well as some other more exotic sources like simultaneous interactions of four pions [3,4,5,6] These partonic and hadronic channels have been studied in detail in Refs. [7,8] at the top Super-Proton-Synchrotron (SPS) and Relativistic-Heavy-Ion-Collider (RHIC) energies and it has been found that the partonic channels clearly dominate over multi-pion sources in the intermediate dilepton mass regime This contribution aims to summarize the perspectives of dilepton measurements for studying the vector meson resonances produced in heavy-ion collisions at relativistic energies as well as to discuss the possible QGP effects on hadronic observables. Our study is based on the Parton-HadronString Dynamics (PHSD) transport model [9]
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