Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 21: Heavy Ions II

HK 21.7: Talk

Tuesday, March 9, 2004, 17:15–17:30, F

Ξ⁻ and Ξ⁺ production in Pb+Pb collisions at 40A·GeV at CERN SPS — •Christine Meurer¹, C. Alt¹, C. Blume¹, P. Buncic¹, P. Dinkelaker¹, D. Flierl¹, V. Friese^2,3, M. Gazdzicki¹, M. Kliemant¹, S. Kniege¹, I. Kraus², B. Lungwitz¹, S. Radomski², R. Renfordt¹, A. Richard¹, A. Sandoval², R. Stock¹, and H. Ströbele¹ — ¹Fachbereich Physik der Universität, Frankfurt/M — ²Gesellschaft für Schwerionenforschung (GSI), Darmstadt — ³Fachbereich Physik der Universität, Marburg

We present new results on the Ξ⁻ and Ξ⁺ production in central and minimum bias Pb+Pb collisions at 40 A·GeV, measured by the large acceptance hadron spectrometer NA49. Rapidity and transverse mass spectra as well as an estimate for the total multiplicity of Ξ⁻ hyperons in central reactions are shown.
The comparison to measurements at other energies gives insight into the excitation function of the production of multiple strange baryons in heavy ion collisions.
The system size dependence of the Ξ⁻ production is discussed in terms of centrality selected minimum bias data at 40 A·GeV. Furthermore, we show the Ξ⁺/Ξ⁻ ratio in dependence on collision centrality and beam energy.
Finally, our results are compared to other measurements and model predictions.