The Vector Probe in Heavy-Ion Reactions

Abstract

We review essential elements in using the $J^P=1^{-}$ channel as a probe for hot and dense matter as produced in (ultra-) relativistic collisions of heavy nuclei. The uniqueness of the vector channel resides in the fact that it directly couples to photons, both real and virtual (dileptons), enabling the study of thermal radiation and in-medium effects on both light ($\rho ,\omega ,\varphi$) and heavy ($\Psi ,{\rm Y}$) vector mesons. We emphasize the importance of interrelations between photons and dileptons, and characterize relevant energy/mass regimes through connections to Quark-Gluon-Plasma emission and chiral symmetry restoration. Based on critical analysis of our current understanding of data from fixed-target energies, we identify open key questions to be addressed.

arXiv commentInvited Talk at the Hot Quarks 2004 Workshop, July 18-24, 2004 (Taos Valley, NM, USA), 15 pages latex incl 14 figs and iop style files, to appear in the proceedings

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• Comparison of Chemical Freeze-Out Criteria in Heavy-Ion Collisions
• Hydrodynamic Models for Heavy Ion Collisions
• Dilepton Radiation at the CERN Super Proton Synchrotron
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• The Chiral Restoration Transition of QCD and Low Mass Dileptons
• Bottomonium Production at RHIC and LHC
• Dilepton production and resonance properties within a new hadronic transport approach in the context of the GSI-HADES experimental data
• High Momentum Dilepton Production from Jets in a Quark Gluon Plasma
• Direct photon production from hadronic sources in high-energy heavy-ion collisions
• Global Properties of Nucleus-Nucleus Collisions
• Effective spectral function of vector mesons via lifetime analysis
• Light Vector Mesons
• Relativistic Nucleus-Nucleus Collisions and the QCD Matter Phase Diagram
• The structure of the f_0(980) from system size dependent hadronic resonance ratios in p+p, p+Pb, and Pb+Pb collisions at the LHC
• Hadronization and chirality in strongly interacting partonic matter - the future of the RHIC program
• Electromagnetic Radiation and in-Medium Effects