Direct Photon Production in 158 A GeV 208Pb + 208Pb collisions
Abstract
A measurement of direct photon production in 208Pb + 208Pb collisions at 158 A GeV has been carried out in the CERN WA98 experiment. The invariant yield or upper limit of direct photons as a function of transverse momentum in the interval 0.5 < pT < 4 GeV/c is presented. A significant direct photon excess is observed at pT > 1.5 GeV/c in central collisions. The results are compared to proton-induced results and to theoretical predictions. Implications for the dynamics of high-energy heavy-ion collisions are discussed.
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