Ultra-peripheral collisions of relativistic heavy ions

We report the first observation of exclusive p production in ultra-peripheral collisions at RHIC. The p are produced electromagnetically at large impact parameters where no hadronic interactions occur. The produced p have a small perpendicular momentum, consistent with production that is coherent on both the photon emitting and scattering nuclei. We observe both exclusive p production, and p production accompanied by electromagnetic dissociation of both nuclei. We discuss models of vector meson production and the correlation with nuclear breakup. We also observe e(+)e(-) pair production in these ultra-peripheral collisions.