Photons from Pb-Pb Collisions at CERN SPS

Abstract

High energy photon emission rate from matter created in Pb + Pb collisions at CERN SPS energies is evaluated. The evolution of matter from the initial state up to freeze-out has been treated within the framework of (3+1) dimensional hydrodynamic expansion. We observe that the photon spectra measured by the WA98 experiment are well reproduced with hard QCD photons and photons from a thermal source with initial temperature ~ 200 MeV. The effects of the spectral changes of hadrons with temperature on the photon emission rate and on the equation of state are studied. Photon yield for Au + Au collisions at RHIC energies is also estimated.

To appear in Phys. Rev. C (Rapid Communications)

References in corpus (2)

• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• A unique large thermal source of real and virtual photons in the reactions Pb(158 AGeV) + Pb, Au

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