Köln 2004 – scientific programme
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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. Friese2,3, 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 mT 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).