Equation of State of Hadronic matter and Electromagnetic Radiation from Relativisitic Heavy Ion Collisions

Abstract

We study the radiation of thermal photons and dileptons likely to be produced in relativistic heavy ion collisions. We find that the thermal photon multiplicity scales with the charged pion multiplicity as $d{N}_{ch}/dy{)}^{\alpha }$ with $\alpha \sim 1.2$ for a transversely expanding system, contrary to the general belief of a quadratic dependence. The scaling is shown to be valid, both for real and virtual photons. The coefficient of proportionality at a given energy may help us identify the appropriate equation of state of hot hadronic matter produced in such collisions.

3 pages, RevTeX, three figures in postscript

Cited by in corpus (8)

• Hadronic Production of Thermal Photons
• Direct Photons from Relativistic Heavy-Ion Collisions
• Radiation of single photons from $Pb+Pb$ collisions at the CERN SPS and quark hadron phase transition
• Production of intermediate-mass dileptons in relativistic heavy ion collisions
• Photon emission in Pb+Pb collisions at SpS and LHC
• Scaling of hadronic transverse momenta in a hydrodynamic treatment of relativistic heavy ion collisions
• Dielectron Production in Heavy Ion Collisions at 158 GeV/c per Nucleon
• Direct Photon Production in Heavy Ion Reactions at SPS and RHIC