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We present results on the centrality and system size dependence of(multi-strange)hyperons in Pb+Pb collisions at 40$A$ and 158$A$ GeV from theUltra-relativistic Quantum Molecular Dynamics (UrQMD-v2.3) model and a coupledBoltzmann+hydrodynamics calculation. The second approach is realized in ahybrid fashion based on UrQMD with an intermediate hydrodynamical evolution forthe hot and dense stage of the collision. This implementation allows acomparison of microscopic transport calculations with hydrodynamic simulationsto explore the transition from a system that is not fully equilibrated such asC+C or Si+Si collisions, to a supposedly fully equilibrated system, such asthat created in Pb+Pb reactions. The results of our calculation are compared tomeasurements of the (anti-)hyperon yields at midrapidity ($\mid$y$\mid$ $\leq$0.5) and total multiplicities performed by the NA49 and NA57 Collaborations at40$A$ and 158$A$ GeV. Furthermore, we compared our predictions to thecentrality dependence of $\Lambda$, $\bar{\Lambda}$ and $\Xi^{-}$ rapidityspectra and total multiplicities at 40$A$ and 158$A$ GeV, where possible.

physical review. c. nuclear physics/physical review. c, nuclear physics

Centrality and system size dependence of (multi-strange) hyperons at  40$A$ and 158$A$ GeV: A comparison between a binary collision and a Boltzmann  + hydrodynamic hybrid model