Low-Mass Dileptons at the CERN-SpS: Evidence for Chiral Restoration?

Details Low-Mass Dileptons at the CERN-SpS: Evidence for Chiral Restoration? Low-Mass Dileptons at the CERN-SpS: Evidence for Chiral Restoration?

1999-07-26

arxiv.org/abs/hep-ph/9907502v1

Eur.Phys.J.A6:415-420,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages ReVTeX including 5 eps-figures

Scientific paper

10.1007/s100500050364

Using a rather complete description of the in-medium $\rho$ spectral function - being constrained by various independent experimental information - we calculate pertinent dilepton production rates from hot and dense hadronic matter. The strong broadening of the $\rho$ resonance entails a reminiscence to perturbative $q\bar q$ annihilation rates in the vicinity of the phase boundary. The application to dilepton observables in Pb(158AGeV)+Au collisions - incorporating recent information on the hadro-chemical composition at CERN-SpS energies - essentially supports the broadening scenario. Possible implications for the nature of chiral symmetry restoration are outlined.

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