2003/12/31 by Thorsten Renk, Amruta Mishra
Physics and Astronomy · #Hadron #High-Energy Particle Collisions Research #Invariant mass #Large Hadron Collider #Meson #Nuclear physics #Observable #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quark–gluon plasma #Quasiparticle #Spectral function #Superconductivity #Virtual particle #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.69.054905
published as Phys.Rev. C69 (2004) 054905 · 24 pages including 7 figures
arxiv created 2004/03/23 · openalex publication_date 2004/05/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The vacuum polarization effects from the nucleon sector lead to large medium modifications of the vector meson masses in the Walecka model. With a quantum hadrodynamic framework including the quantum effects, and using a quasiparticle description for quark gluon plasma, the dilepton emission rate from the hot and dense matter resulting from relativistic nuclear collisions is calculated. Using a model for the fireball evolution which has been shown to reproduce other observables such as charmonium suppression, photon emission, and the abundance of hadronic species, we compare with the dilepton invariant mass spectrum measured by the CERES Collaboration at CERN SPS. We also compare the results to a previous calculation where the spectral function of a virtual photon (a key ingredient for the emission rate) has been calculated in a chiral SU(3) model.