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Pion-kaon correlation functions are constructed from central Au+Au STAR data taken at sqrt[s(NN)]=130 GeV by the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The results suggest that pions and kaons are not emitted at the same average space-time point. Space-momentum correlations, i.e., transverse flow, lead to a space-time emission asymmetry of pions and kaons that is consistent with the data. This result provides new independent evidence that the system created at RHIC undergoes a collective transverse expansion.

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We present the first measurement of midrapidity vector meson production in AuϩAu collisions at RHIC (ͱs NN ϭ130 GeV) from the STAR detector. For the 11% highest multiplicity collisions, the slope parameter from an exponential fit to the transverse mass distribution is Tϭ379Ϯ50(stat)Ϯ45(syst) MeV, the yield dN/dyϭ5.73Ϯ0.37(stat)Ϯ0.69(syst) per event, and the ratio N /N h Ϫ is found to be 0.021Ϯ0.001(stat) Ϯ0.004(syst). The measured ratio N /N h Ϫ and T for the meson at midrapidity do not change for the selected multiplicity bins.

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