Comparison of the space–time extent of the emission source in d+Au and Au+Au collisions at √(s_NN)=200 GeV

Two-pion interferometry measurements in d+Au and Au+Au collisions at √(s_NN)=200 GeV are used to extract and compare the Gaussian source radii R_out, R_side and R_long, which characterize the space–time extent of the emission sources. The comparisons, which are performed as a function of collision centrality and the mean transverse momentum for pion pairs, indicate strikingly similar patterns for the d+Au and Au+Au systems. They also indicate a linear dependence of R_side on the initial transverse geometric size R^¯, as well as a smaller freeze-out size for the d+Au system. These patterns point to the important role of final-state re-scattering effects in the reaction dynamics of d+Au collisions