Femtoscopy studies using the EPOS and UrQMD models

Femtoscopy is a method used to investigate particle correlations by using the experimentally accessible two-particle momentum correlation function. This function can be mathematically obtained by integrating the product of the source function and the two-particle wave function. Currently there is a lot of focus on investigating hyperon-nucleon interactions using experimental data collected by ALICE at LHC and by HADES at GSI. The EPOS and UrQMD transport models can be used to describe the emission source at high and low collision energies respectively. Those models can be tested by comparing their predicted correlation function to the experimentally obtained one for a known interaction, e.g. pp. If the determination of the source is proven robust one could rely on the model and investigate the interaction potential for particle pairs which do not have well determined scattering parameters, e.g. pΛ. Furthermore having the source fixed at both high and low energies will allow for a direct comparison of the interaction at different energies. However the EPOS model predicts very small source-radii which may break-down the standardly used asymptotic approximation. This motivated the development of a framework working with a numerical evaluation of the wave-function.