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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Physik mit schweren Ionen
HK 13.5: Talk
Monday, March 10, 2008, 17:45–18:00, 2E
Two-particle correlations in Pb+Au collisions at CERN SPS energies — •Simone Schuchmann, Dariusz Antończyk, Harald Appelshäuser, Stefan Kniege, and Mateusz Płoskoń for the CERES collaboration — Institut für Kernphysik, Max-von-Laue-Str.1, 60438 Frankfurt am Main
The investigation of momentum correlations of identical bosons yields information about the spatial and temporal evolution of the particle emitting source in heavy-ion collisions. A well-established technique to study space-time dimensions in such reactions is Hanbury-Brown Twiss (HBT) interferometry. Measurements of HBT parameters have been reported by several experimental collaborations from AGS to RHIC, spanning two orders of magnitude in √sNN. The energy dependence may be interpreted in terms of a universal freeze-out scenario [1,2]. However, in the SPS regime systematic uncertainties do not yet allow to derive final conclusions from the measured excitation function of the HBT parameters [3,4]. Hence, a reanalysis of the data sets for 40, 80 and 158 AGeV collected in 1999 and 2000, employing an improved calibration scheme of the CERES TPC, is being performed.
Recent results of the HBT analysis at 40, 80 and 158 AGeV as well as a comparison to previous results will be presented and discussed in the context of different freeze-out scenarios.
This work is supported by BMBF and GSI.
D.Adamová et al., PRL 90(2003) 022301; [2] Q.Li, M.Bleicher and H.Stöcker, nucl-th/0706.2091v2; [3] D.Adamová et al. Nucl.Phys. A 714 (2003) 124; [4] C.Alt et al., nucl-ex/0709.4507v2