Sprecher
Beschreibung
The main goal of the Compressed Baryonic Matter (CBM) Experiment at FAIR is to
probe the QCD phase diagram at high net-baryon densities and moderate temperatures with
nucleus-nucleus collisions, in order to locate the possible first order phase transition from
hadronic to partonic matter and its critical end point (CEP). The higher moments (cumulants)
of conserved quantities, such as baryon number, strangeness and electrical charge, are
suggested to be sensitive to the proximity of the CEP. In order to assess the behavior of
these cumulants, it is crucial to determine the reaction volume. Indeed, different procedures
for centrality selection, based on participant multiplicity with the STS detector or on
spectator multiplicity with the new FSD detector, allow us to study reaction volume
fluctuations and their impact on net-baryon cumulants. In this work, we explore these
different procedures using the hadronic transport models SMASH and PHQMD.
