Low-mass dileptons at the CERN-SpS: evidence for chiral restoration?

Citation
R. Rapp et J. Wambach, Low-mass dileptons at the CERN-SpS: evidence for chiral restoration?, EUR PHY J A, 6(4), 1999, pp. 415-420
Citations number
44
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL A
ISSN journal
14346001 → ACNP
Volume
6
Issue
4
Year of publication
1999
Pages
415 - 420
Database
ISI
SICI code
1434-6001(199912)6:4<415:LDATCE>2.0.ZU;2-B
Abstract
Using a rather complete description of the in-medium rho spectral function - being constrained by various independent experimental information - we ca lculate pertinent dilepton production rates from hot and dense hadronic mat ter. The strong broadening of the rho resonance entails a reminiscence to p erturbative q (q) over bar annihilation rates in the vicinity of the phase boundary. The application to dilepton observables in Pb(158AGeV) + Au colli sions - incorporating recent information on the hadro-chemical composition at CERN-SpS energies - essentially supports the broadening scenario. Possib le implications for the nature of chiral symmetry restoration are outlined.