Photoproduction at Relativistic Heavy Ion Collider with STAR

Relativistic heavy ions carry strong transverse electromagnetic fields which can be treated as sources of quasi-real virtual photons. The ions interact through photon-Pomeron and photon-photon collisions at impact parameter more than twice the nuclear radius, so hadronic interactions are suppressed. We present recent results of the STAR experiment at RHIC on $\rho^{0}(770)$ production in AuAu collisions at various energies. Also we present a new measurement of $J/\psi$ photoproduction in 200 (GeV) AuAu collisions at RHIC. The $p_{T}$ distribution of the $J/\psi$ mesons peaks at very low $p_{T}$, consistent with expectations for coherent photoproduction. Both the photoproduction cross section and the $J/\psi$ rapidity distribution are expected to show the effects of gluon shadowing. A measurement of the ratio of $J/\psi$ to $\rho^{0}$ meson cross sections in 200 (GeV) AuAu collisions, as well as a distribution of rapidity within $\mid y \mid < 1$ for the $J/\psi$ mesons are presented.