Results from the WA93 photon multiplicity detector

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Multiplicity and pseudorapidity distribution of photons in S+Au reaction at 200A GeV

The photon multiplicity has been measured for the first time in S+Au collisions at 200A GeV over a wide pseudorapidity range (2.8 less than or equal to eta less than or equal to 5.2) employing a fine granularity preshower detector. The pseudorapidity density of photons increases with centrality, reaching similar to 200 at the highest centrality studied. The results are compared with measurements of the charged particle multiplicity and with predictions of the VENUS event generator

Soft Photon Production in Central 200 GeV/Nucleon ^{32}S+Au Collisions

Inclusive photons of low transverse momenta have been measured in 200 GeV/nucleon S-32+Au collisions at the CERN SPS. Data were taken in the WA93 experiment using a small acceptance BGO detector with longitudinal segmentation. The results are compared to WA80 measurements for the same system and results from hadron decay calculations, An excess of soft photons over the expectations from neutral meson decays is observed