Photons from Pb + Pb and S + Au Collisions at CERN SPS Energies
  The effects of the variation of vector meson masses and decay widths on photon production from hot strongly interacting matter formed after Pb + Pb and S + Au collisions at CERN SPS energies are considered. It has been shown that the present photon spectra measured by WA80 and WA98 Collaborations can not distinguish between the formation of quark matter and hadronic matter in the initial state. 
Sourav Sarkar, Pradip Roy, Jan-e Alam and Bikash Sinha