Abstract
We present a summary of recent photoproduction results in ultra peripheral relativistic heavy ions collisions with STAR. These collisions have impact parameters larger then twice the nuclear radius; the nuclei do not physically collide, but interact via long-range electromagnetic fields. We observe exclusive rho(0) production as well as AuAu -> Au*Au*rho(0) with accompanying mutual nuclear excitation at root sNN = 200 GeV. We report the rho(0) production cross section for both coherent and incoherent coupling accompanied by mutual nuclear excitation. We have studied the cross section as a function of PT, y rho(0) and M-pi pi and compared it to theoretical models. In addition, we measured the rho(0) helicity matrix elements. They are found to be consistent with s-channel helicity conservation. The ratio of coherent rho(0) and direct pi(+) pi(-) pair photoproduction has been measured and found to be consistent with earlier measurements. The 4-pion final state AuAu -> pi(+) pi(-) pi(+) pi(-) state has also been observed.