Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 6: Heavy Ions I

HK 6.3: Gruppenbericht

Montag, 11. März 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 p_T 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 p_T 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.