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Observation of Direct Photons in Central Pb-Pb Collisions at 158 A GeV
Direct photon spectrum measured in Pb-Pb collisions at 158A GeV
The invariant direct photon multiplicity for central 158 AGeV 208Pb+208Pb collisions. The error bars indicate the combined statistical and systematical errors. Data points with downward arrows indicate unbounded 90% CL upper limits. Results of several direct photon measurements for proton induced reactions have been scaled to central 208Pb+208Pb collisions for comparison.
Published in Phys. Rev. Lett. 85 (2000) 3595
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Last modified Tuesday 04 December 2001 by H.Schlagheck [schlagheck@cern.ch]