Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 2: Heavy Ion Reactions I, Ultrarelativistic Energies

HK 2.5: Vortrag

Montag, 16. März 1998, 15:15–15:30, P

Event by Event Analysis of Azimuthal Anisotropies in Pb + Pb Reactions at 158AGeV ^* — •H. Schlagheck¹, C. Barlag¹, S. Bathe¹, C. Blume¹, Z. B"or"ocz¹, D. Bucher¹, H. B"usching¹, S. Gorus¹, R. Glasow¹, S. Joerrens¹, H. K"ohncke¹, T. Kr"umpel¹, T. Peitzmann¹, K. Reygers¹, R. Santo¹, and WA98² — ¹Institut f"ur Kernphysik, Universit"at M"unster, D-48149 M"unster — ²

At the SPS first hints of directed flow and azimuthal asymmetries have been observed. The WA98 experiment, with its variety of azimuthally symmetric detectors, is well suited for event shape analysis. The measurement of directed flow of baryons with the Plastic Ball detector can be used to determine the reaction plane. Preliminary results indicate that a significant effect is present in semi-central reactions.
The azimuthal angle of the total transverse energy is determined for each event using particles identified by the Plastic Ball detector. The influence of the directed flow on the p_T-spectra of photons, measured with the leadglass calorimeter LEDA, is studied for Pb + Pb reactions at 158 GeV per nucleon and p_T-spectra, measured for different orientations of the reaction plane, are analysed as a function of centrality.
^* Partly supported by the German BMBF and the GSI.