arXiv:hep-ph/0008074·v4·High Energy Physics — Phenomenology
Photons from Pb-Pb Collisions at CERN SPS
Jan-e Alam🇯🇵 · Sourav Sarkar🇮🇳 · T. Hatsuda🇯🇵 · Tapan K. Nayak🇮🇳 · Bikash Sinha🇮🇳
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.
Comments: To appear in Phys. Rev. C (Rapid Communications)