Photons from Pb-Pb Collisions at CERN SPS

Details Photons from Pb-Pb Collisions at CERN SPS Photons from Pb-Pb Collisions at CERN SPS

2000-08-09

arxiv.org/abs/hep-ph/0008074v4

Phys.Rev. C63 (2001) 021901

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevC.63.021901

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.

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