Photons from Pb-Pb Collisions at CERN SPS
High Energy Physics - Phenomenology
2009-10-31 v4 Nuclear Theory
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.
Cite
@article{arxiv.hep-ph/0008074,
title = {Photons from Pb-Pb Collisions at CERN SPS},
author = {Jan-e Alam and Sourav Sarkar and T. Hatsuda and Tapan K. Nayak and Bikash Sinha},
journal= {arXiv preprint arXiv:hep-ph/0008074},
year = {2009}
}
Comments
To appear in Phys. Rev. C (Rapid Communications)