Comment on: ``Search for direct photons from S-Au Collisions at 200 GeV/nucleon'' by the CERES Collaboration

Details Comment on: ``Search for direct photons from S-Au Collisions at 200 GeV/nucleon'' by the CERES Collaboration Comment on: ``Search for direct photons from S-Au Collisions at 200 GeV/nucleon'' by the CERES Collaboration

1997-03-27

arxiv.org/abs/hep-ph/9703440v1

Z.Phys. C74 (1997) 587-591

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 1 figure, Accepted for publication in Z. Phys. C

Scientific paper

In this note we comment on a recent publication in this journal by the CERES (NA45) Collaboration. The authors report to have determined an upper limit on the direct photon yield relative to the decay photon yield in S+Au collisions of 14 % and 7 % by two different methods, respectively. We argue that these limits are unsupported by the results and analysis of the CERES data. The systematic error estimates quoted in the CERES analysis are consistently overly optimistic. Using more realistic estimates of the various error contributions and propagating them appropriately we arrive at a direct photon upper limit which at best is 20% of the inclusive photon yield, and most probably is much higher.

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