Model studies of two-particle correlations in small and large collision systems

The models UrQMD, AMPT and Hijing were used to study the two-particle correlations of identified hadrons in Au+Au collisions over a range of beam energies from 7.7 to 200 GeV at RHIC. The angular correlations of like-sign and unlike-sign mesons (π and K) and baryons (p) were measured allowing the contributions of different physics mechanisms to the observed correlations to be inferred. The model results will also be compared to preliminary experimental results from the STAR Collaboration which exhibit positive short-range correlations in two meson pairs, and a strong anticorrelation in proton pairs. The two particle correlations will also be presented for the small system of p+p at 200 GeV using different versions of the Pythia model. The implications of such model studies for the understanding of the two-particle correlations in both small and large systems will be discussed.