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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 46: Heavy Ion Reactions V, Ultrarelativistic Energies

HK 46.9: Talk

Wednesday, March 18, 1998, 16:45–17:00, P

Measurement of Direct Photons in the WA98 Experiment* — •D. Bucher1, C. Barlag1, S. Bathe1, C. Blume1, H. B"usching1, Z. B"or"ocz1, R. Glasow1, S. Gorus1, S. J"orrens1, H. K"ohncke1, T. Kr"umpel1, T. Peitzmann1, K. Reygers1, R. Santo1, H. Schlagheck1, and WA9821Institut f"ur Kernphysik, Universit"at M"unster, D-48149 M"unster — 2

The measurement of direct photons provides a means to look directly into the early phase of the space time evolution of high energy heavy ion collisions and thereby into a possible phase transition to a quark gluon plasma. In addition, it allows to study the emission of photons from hadronic sources in the mixed phase. Unfortunately the signal is overlayed by a large background of photons mainly from π0 and η meson decay.

In the WA98 experiment at the SPS reactions of Pb + Pb at 158 A GeV were studied. Photons have been measured by the lead-glass spectrometer LEDA, which provides high spatial and momentum resolution. From the inclusive photon data π0 and η meson pT-spectra are extracted. They are then used as input to a Monte Carlo calculation of the decay photons. The WA98 excess photon pT-spectra will be shown in comparison with theoretical calculations and results from WA80. They allow the estimation of the initial and critical temperatures of the reaction.
* Partly supported by the German BMBF and the GSI.

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