Dilepton production from hydrodynamically expanding fireball

Abstract

A hybrid model is put forward for describing relativistic heavy ion collisions. The early interaction stage responsible for entropy creation is calculated within the transport Quark-Gluon String Model resulting in an initial state. The passage to subsequent isoentropic expansion proceeds with exact account for all conservation laws. Relativistic 3D hydrodynamics with the mixed phase equation of state is applied to this expansion stage. Essential differences in evolution of a fireball, described within this model and one for the Bjorken regime, are noted. The in-medium modified $e^{+}{e}^{-}$ spectra are studied and confronted with the recent CERES/NA45 data for 8% central Pb+Au collisions at the bombarding energy 158 AGeV.

Poster section of Quark Matter 2005 Conference, Budapest; submitted to Acta Physica Slovaca

References in corpus (5)

• Determination of the Equation of State of Dense Matter
• Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
• Medium Modifications of the Rho Meson at CERN/SPS Energies
• Relativistic Heavy-Ion Collisions within 3-Fluid Hydrodynamics: Hadronic Scenario
• Enhanced Production of Low-Mass Electron Pairs in 40 AGeV Pb-Au Collisions at the CERN SPS