Non-identical particle correlations offer new methods of probing the dynamics of the heavy-ion collision. In STAR we have performed a correlation analysis of pion-kaon and pion-proton pairs for 130 AGeV AuAu collisions. The results show that average emission space-time points of these particle species are not the same. These asymmetries are interpreted as a consequence of space-momentum correlations produced by rapid transverse radial expansion of the system. The effects of emission time differences, coming from the decay of resonances, are also investigated with the help of rescattering models, and explain only part of the asymmetry. Therefore our measurements represent an independent confirmation of the existence of transverse radial flow.

PACS numbers: 25.75.Gz, 25.75.Ld