Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 46: Heavy Ion Reactions V, Ultrarelativistic Energies

HK 46.5: Talk

Wednesday, March 18, 1998, 15:45–16:00, P

Search for direct Photons with CERES — •M. Messer for the CERES Collaboration — Physikalisches Institut der Universität Heidelberg, Philosophenweg 12, D-69120 Heidelberg

In autumn 1996 the CERES Experiment recorded 5.5 million events from Pb-Au collisions at 160 GeV/c per nucleon in a dedicated photon run. In order to obtain a clear signature from conversions of photons into an electron-positron pair, a converter was installed between the two silicon drift detectors which form the target telescope in CERES.
The interest of such a setup lies in the potential detection and study of photons which may be emitted in excess of those coming from hadron decays. Such a signal, which is theoretically predicted for a hot hadron gas, or even more interestingly, for a phase transition into a quark-gluon plasma, has so far not been observed in experiment.
We present the status of the analysis and discuss implications.