Update on Chiral Symmetry Restoration in the Context of Dilepton Data

Abstract

We evaluate currently available information on low-mass dilepton and direct-photon emission spectra measured in ultrarelativistic heavy-ion collisions. In the first part an attempt is made to develop a consistent picture of the in-medium effects on the electromagnetic spectral function and pinpoint its emission history by utilizing its radial and elliptic flow signatures. In the second part we elaborate on the implications of the empirical information on the nature of chiral symmetry restoration. We indicate how the melting of the $\rho$ resonance in hot and dense matter is related to, and compatible with, the reduction of chiral order parameters as "measured" in thermal lattice QCD.

13 pages, 10 figures; proceedings of the 11th International Conference on Nucleus-Nucleus Collisions, San Antonio (TX, USA), May 27 - June 01, 2012; to be published in Journal of Physics: Conference Series (JPCS)

References in corpus (14)

• Thermal Photons and Collective Flow at the Relativistic Heavy-Ion Collider
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• NA60 results on thermal dimuons
• Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
• Dielectron production in Ar+KCl collisions at 1.76A GeV
• Viscous photons in relativistic heavy ion collisions
• Evidence for radial flow of thermal dileptons in high-energy nuclear collisions
• The lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory
• Low Mass Dimuons Produced in Relativistic Nuclear Collisions
• Thermal Dimuon Yields at NA60
• Ideal Hydrodynamics for Bulk and Multistrange Hadrons in $\sqrt{s_{NN}}$=200\,AGeV Au-Au Collisions
• Dimuon radiation at the CERN SPS within a (3+1)d hydrodynamic+cascade model
• Sum rule analysis of vector and axial-vector spectral functions with excited states in vacuum
• $\rho$ self energy at finite temperature and density in the real-time formalism

Cited by in corpus (4)

• Is Rho-Meson Melting Compatible with Chiral Restoration?
• Chiral symmetry restoration in heavy-ion collisions at intermediate energies
• Baryon and meson screening masses
• Electromagnetic Radiation in Hot QCD Matter: Rates, Electric Conductivity, Flavor Susceptibility and Diffusion