München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 39: Physik mit schweren Ionen
HK 39.4: Vortrag
Mittwoch, 22. März 2006, 17:45–18:00, D
The measurement of the neutral kaon production in central Pb-Au collisions at CERN SPS top energy — •Sylwester Radomski — Gesellschaft fuer Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
A precision measurement of Ks0 spectra in central Pb-Au collisions at 158 GeV per nucleon was performed by the CERES collaboration. The analysis used the large statistics of 30 million events with a centrality σ / σgeo < 7 % collected during the CERN SPS run in October 2000.
The yield of neutral kaons was extracted from the invariant mass spectrum of pion pairs reconstructed by the radial TPC. The acceptance for Ks0 → π π decay covers the bulk of the transverse momentum spectra at pT < 1.8 GeV/c in the rapidity range 2 < y < 2.6 and thus allows an independent measurement of temperature and yield.
The measured spectra give an inverse slope value of 220 ± 4stat ± 10sys MeV and the extrapolation of the yield to midrapidity gives dN/dy = 21.2 ± 0.9stat ± 2.0sys .
The talk presents details of the analysis, Monte-Carlo studies of the efficiency and corrected spectra. The results are compared with the prediction of the thermal model and results on Ks0 from the NA57 and (K++K−)/2 from the NA49 experiments.