Canonical aspects of strangeness enhancement
  Strangeness enhancement (SE) in heavy ion collisions can be understood in the statistical model on the basis of canonical suppression. In this formulation,SE is a consequence of the transition from canonical to the asymptotic grand canonical limit and is predicted to be a decreasing function of collision energy. This model predictions are consistent with the recent NA49 data on $\Lambda$ enhancement at $p_{lab}=40, 80, 158$ GeV. 
A. Tounsi (Univ. Paris 7), A. Mischke (GSI, Darmstadt), Krzysztof   Redlich (Univ. Wroclaw)