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Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Physik mit schweren Ionen

HK 13.7: Vortrag

Montag, 10. März 2008, 18:15–18:30, 2E

Two- and three particle correlations of high-pt charged particles in heavy ion collisions at CERN SPS energy*Stefan Kniege, •Dariusz Antonczyk, Harald Appelshäuser, and Simone Schuchmann for the CERES collaboration — Institut für Kernphysik Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt a.M.

The analysis of azimuthal correlations of hadrons with high transverse momenta provide a unique tool to study the interactions of partons with the medium in an early stage of heavy ion collisions. A detailed analysis of two particle correlations in Pb-Au collisions from the CERES experiment at top SPS energy will be presented. The key observation is a non-Gaussian shape on the "away-side" of the two particle correlation function in central collisions indicating significant interactions of partons traversing the medium even at SPS energy. A study of the correlations for different charge combinations of trigger and associate particles reveals charge ordering in the fragmentation process and sensitivity to the charges of the interacting partons. Hence the analysis may reveal properties of the initial as well as the final state of the collision. To further investigate the pattern of the two particle correlation function an analysis based on three particle correlations is presented. Different scenarios like elastic scattering of the initial partons or the evolution of a mach cone can lead to the same observable shape of the two particle correlation function. The three particle analysis presented gives strong indications for a cone like emission of hadrons emerging from hard parton-parton interactions in the collisions.
This work was supported by BMBF, GSI and H-QM.

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