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HK: Hadronen und Kerne

HK 2: Heavy Ion Reactions I, Ultrarelativistic Energies

HK 2.2: Vortrag

Montag, 16. März 1998, 14:30–14:45, P

Event by Event Wavelet Analysis of Pb+Pb Collisions at 158 GeV/Nucleon* — •M. Oldenburg, A. Billmeier, M. Gaździcki, C. Roland, G. Roland, R. Stock, and H. Ströbele — Institut für Kernphysik, Universität Frankfurt,
August-Euler-Str. 6, D-60486 Frankfurt

The NA49 experiment at the CERN SPS detects up to 1500 charged particles in a single central Pb+Pb collision. At this high multiplicity statistical fluctuations are small enough to search for dynamical fluctuations of the momentum distributions of the produced particles (mainly pions) for single events. In view of the formation of Disoriented Chiral Condensates (DCC’s) we classify the events according to the shape of the momentum distributions of the pions.
The occurrence of DCC’s implies the clustering of pions in phase space, especially in momentum space. However because of subsequent multiscattering this signal will be diluted and the final size of the domain occupied by these pions in phase space is not known. To recognize such events with peculiar momentum distributions we are using wavelet transforms [1] which allow a detailed analysis independent of scale.
[1] M. Greiner, J. Giesemann, P. Lipa, P. Carruthers, Z. Phys. C 69, 305 (1996)
*Supported by BMBF