The Vector Probe in Heavy-Ion Reactions

Details The Vector Probe in Heavy-Ion Reactions The Vector Probe in Heavy-Ion Reactions

2004-09-23

arxiv.org/abs/nucl-th/0409054v1

J.Phys. G31 (2005) S217-S230

Physics

Nuclear Physics

Nuclear Theory

Invited Talk at the Hot Quarks 2004 Workshop, July 18-24, 2004 (Taos Valley, NM, USA), 15 pages latex incl 14 figs and iop sty

Scientific paper

10.1088/0954-3899/31/4/027

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 ($\rho, \omega, \phi$) and heavy ($\Psi, \Upsilon$) 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.

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