In-Medium Vector Mesons, Dileptons and Chiral Restoration

Details In-Medium Vector Mesons, Dileptons and Chiral Restoration In-Medium Vector Mesons, Dileptons and Chiral Restoration

2010-10-08

arxiv.org/abs/1010.1719v1

AIP Conf.Proc.1322:55-63,2010

Physics

Nuclear Physics

Nuclear Theory

9 pages, 12 figures, Proceedings of Chiral 2010 (Valencia, June 21-24, 2010)

Scientific paper

10.1063/1.3542032

Medium modifications of the electromagnetic spectral function in hadronic and quark-gluon matter are reviewed. A strong broadening of the $\rho$ meson, which dominates the spectral function in the low-mass regime, is quantitatively consistent with dilepton excess spectra measured in photoproduction off cold nuclei (CLAS/JLab) and in fixed-target ultrarelativistic heavy-ion collisions (NA45,NA60/CERN-SPS). The large excess observed by PHENIX at RHIC remains unexplained to date, but is most likely not due to emission from the Quark-Gluon Plasma. Connections to thermal lattice QCD promise progress in the search for chiral symmetry restoration.

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