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HK: Physik der Hadronen und Kerne

HK 21: Heavy Ions II

HK 21.9: Talk

Tuesday, March 9, 2004, 17:45–18:00, F

Ω⁻ and Ω⁺ production in central Pb+Pb collisions at SPS energies^* — •M. Mitrovski¹, C. Alt¹, C. Blume¹, P. Buncic¹, P. Dinkelaker¹, D. Flierl¹, V. Friese^2,3, M. Gazdzicki¹, M. Kliemant¹, S. Kniege¹, I. Kraus², B. Lungwitz¹, C. Meurer¹, S. Radomski², R. Renfordt¹, A. Richard¹, A. Sandoval², R. Stock¹ und H. Ströbele¹ — ¹Institut für Kernphysik, Universität Frankfurt — ²Gesellschaft für Schwerionenforschung (GSI), Darmstadt — ³Fachbereich Physik der Universität, Marburg

Preliminary results on Ω⁻ and Ω⁺ production in central Pb+Pb collisions at 30, 40, 80, and 158 A·GeV are presented.
These measurements are performed using the large acceptance NA49 hadron spectrometer at the CERN SPS which allows for precise determination of particle momenta and decay topologies.
Fully corrected rapidity and m_T spectra in central Pb+Pb collisions at 40 and 158 A·GeV are obtained. Also total multiplicities at 40 and 158 A·GeV are estimated. The yields at mid-rapidity agree closely with the results of WA97/NA57[1]. The ratio of Ω⁺/Ω⁻ is calculated for central Pb+Pb collisions at 30, 40, 80 and 158 A·GeV. This ratio is smaller than 1 for Pb+Pb collisions. The yield measured in central Pb+Pb collisions at 158 A·GeV is close to the expectation of a hadron gas model[2] (grand canonical approximation) with partial strangeness saturation.
^* Supported by BMBF and GSI.

[1] E.Andersen et al. (WA97), Phys. Lett. B449 (1999) 401.

[2] F. Becattini et al., hep-ph/0310049 (2003).