München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 46: Physik mit schweren Ionen

HK 46.1: Vortrag

Donnerstag, 23. März 2006, 14:00–14:15, D

Two-particle correlations in Pb+Au collisions at 158 AGeV — •Dariusz Antończyk — Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany

CERES was originally conceived as a dilepton spectrometer at the CERN SPS. After the upgrade with addition of the TPC, which improved the momentum resolution and extended the detector capabilities to hadrons, CERES collected 30 million Pb+Au events at top SPS energy in the year 2000. A Hanbury-Brown-Twiss (HBT) analysis of pion pairs on a subset of these data, together with the results obtained at other beam energies, lead to a new freeze-out criterion (PRL 90 (2003) 022301). The fully calibrated data set allows to study the dependence of the HBT correlation radii on the orientation of reaction plane and the reconstruction of the spatial source anisotropy at freeze-out. The final results of this analysis will be presented.