Core-corona separation in the UrQMD hybrid model

Understand

We employ the UrQMD transport + hydrodynamics hybrid model to estimate the effects of a separation of the hot equilibrated core and the dilute corona created in high energy heavy ion collisions.

• It is shown that the fraction of the system which can be regarded as an equilibrated fireball changes over a wide range of energies.
• This has an impact especially on strange particle abundancies.
• We show that such a core corona separation allows to improve the description of strange particle ratios and flow as a function of beam energy as well as strange particle yields as a function of centrality.