Abstract
We present a summary of strange particle yields measured by the experiment NA49 in central Pb+Pb collisions in the beam energy range 20–158 A GeV. The comparison with thermal hadron model results shows that above 30 A GeV, a strangeness undersaturation parameter γS must be employed to describe the data. This suggests a change in the strangeness production mechanism at this energy. We find that the UrQMD transport model in all cases underpredicts the observed yield ratios.
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More From: Journal of Physics G: Nuclear and Particle Physics
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