Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-03-05
Nucl.Phys. A698 (2002) 432-435
Physics
Nuclear Physics
Nuclear Theory
4 pages including 4 figures. (Talk given at QM 2001). Corrected two-loop rates for photon production are used
Scientific paper
10.1016/S0375-9474(01)01397-5
The production of single photons in $Pb+Pb$ collisions at the CERN SPS as measured by the WA98 experiment is analysed. A quark gluon plasma is assumed to be formed initially, which expands, cools, hadronizes, and undergoes freeze-out. A rich hadronic equation of state is used and the transverse expansion of the interacting system is taken into account. The recent estimates of photon production in quark-matter (at two loop level) along with the dominant reactions in the hadronic matter leading to photons are used. About half of the radiated photons are seen to have a thermal origin. The same treatment and the initial conditions provide a very good description to hadronic spectra measured by several groups and the intermediate mass dileptons measured by the NA50 experiment, lending a strong support to the conclusion that quark gluon plasma has been formed in these collisions.
Gale Charles
Kvasnikova Ioulia
Sinha Bikash
Srivastava Dinesh Kumar
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