Münster 2002 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 6: Heavy Ions I
HK 6.3: Group Report
Monday, March 11, 2002, 17:15–17:45, E
Recent Results from the WA98-Experiment — •Henner Büsching — University of Münster, Münster, Germany
Recent results from the WA98 experiment with p and Pb induced reactions at 158 AGeV are presented. The CERN-SPS experiment WA98 investigates the properties of hot, dense matter with the main focus on the measurement of photons and neutral mesons with the leadglass detector LEDA.
Azimuthal γ-γ correlations at high pT which are influenced by jet-like structures and elliptic flow have been studied. An influence of energy loss effects (jet-quenching) should be evident in a characteristic modification of the correlation. A clear indication of back-to-back correlations can be seen with strong dependence on the pT of the photons and the size of the system.
Results on transverse mass spectra of neutral pions measured at central rapidity are presented for impact parameter selected Pb+Pb collisions. In going from peripheral to medium central collisions there is a nuclear enhancement increasing with transverse mass similar to the Cronin effect, while for very central collisions this enhancement appears to be weaker than expected.
Finally, results on event-by-event fluctuations of average transverse momentum of photons are presented. The magnitude of those fluctuations can indicate the equilibration level attained in the Pb+Pb collisions.