Ultra-peripheral collisions of relativistic heavy ions
Abstract
We report the first observation of exclusive production in ultra-peripheral collisions at RHIC. The are produced electromagnetically at large impact parameters where no hadronic interactions occur. The produced have a small perpendicular momentum, consistent with production that is coherent on both the photon emitting and scattering nuclei. We observe both exclusive production, and 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.
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