Impact parameter dependencies in Pb(160 AGeV)+Pb reactions -- hydrodynamical vs. cascade calculations

Abstract

We investigate the impact parameter dependence of the specific entropy S/A in relativistic heavy ion collisions. Especially the anti-Lambda/anti-proton ratio is found to be a useful tool to distinguish between chemical equilibrium assumptions assumed in hydrodynamics (here: the 3-fluid model) and the chemical non-equilibrium scenario like in microscopic models as the UrQMD model.

Comments: 3 pages, 2 figures; Contribution to the GSI annual scientific report 1998