Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 21: Heavy Ions II

HK 21.6: Talk

Tuesday, March 9, 2004, 17:00–17:15, F

Λ and Λ production in central Pb+Pb collisions at SPS energies ^* — •A. Richard¹, C. Alt¹, C. Blume², P. Buncic¹, P. Dinkelaker¹, D. Flierl¹, V. Friese^2,3, M. Gazdzicki¹, M. Kliemant¹, S. Kniege¹, I. Kraus², B. Lungwitz¹, C. Meurer¹, M. Mitrovski¹, S. Radomski², R. Renfordt¹, A. Sandoval², R. Stock¹, and H. Ströbele¹ — ¹Institut für Kernphysik, Universität Frankfurt am Main — ²Gesellschaft für Schwerionenforschung (GSI), Darmstadt — ³Fachbereich Physik der Universität, Marburg

In the recent years the NA49 experiment has collected data at beam energies between 20 and 158 AGeV with the objective to cover the critical region of energy densities where the expected phase transition to a deconfined phase might occur. One of the most striking observations is the pronounced maximum in the K⁺/π⁺ ratio. In order to investigate whether this effect appears in other strange particles as well, the Λ/π ratio in central lead lead collisions was analysed.
In this contribution new results at 20 and 30 A·GeV will be presented to complete the previous data from the energy scan at SPS. Transverse momentum and rapidity spectra will be shown. Due to the large acceptance of the NA49 detector total yields can be derived by integrating the rapidity spectra. The results will be compared to predictions of theoretical models.
* Supported by BMBF and GSI.