Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-07-21
Nucl.Phys.A830:579c-582c,2009
Physics
Nuclear Physics
Nuclear Theory
4 pages, 3 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee,
Scientific paper
10.1016/j.nuclphysa.2009.10.052
We reanalyze the WA98 single photon data at CERN SPS by incorporating several recent developments in the study of prompt and thermal photon production from relativistic heavy ion collisions. Isospin and shadowing corrected NLO pQCD, along with an optimized scale for factorization, fragmentation and renormalization are considered for prompt photon production. Photons from thermal medium are estimated by considering a boost invariant azimuthally anisotropic hydrodynamic expansion of the plasma along with a well tested equation of state and initial conditions. A quantitative explanation of the data is obtained by combining $\kappa \times$ prompt with thermal photons, where $\kappa$ is an overall scaling factor. We show that, elliptic flow of thermal photons can play a crucial role to distinguish between the `with' and `without' phase transition scenarios at SPS energy.
Chatterjee Rupa
Gale Charles
Jeon Sangyong
Srivastava Dinesh K.
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