Dynamic canonical suppression of strangeness in transport models
  It is investigated whether canonical suppression associated with the exact conservation of an U(1)-charge can be reproduced correctly by current transport models. Therefore a pion-gas having a volume-limited cross section for kaon production and annihilation is simulated within two different transport prescriptions for realizing the inelastic collisions. It is found that both models can indeed dynamically account for the canonical suppression in the yields of rare strange particles. 
O. Fochler, S.Vogel, M. Bleicher, C. Greiner, P. Koch-Steinheimer, Z.   Xu