Coherent photoproduction of J/Psi and high-mass e+e- pairs in   ultra-peripheral Au+Au collisions at sqrt(s_NN) = 200 GeV
  High energy ultra-peripheral collisions (UPC) of heavy-ions generate strong electromagnetic fields which open the possibility to study gamma-gamma and gamma-nucleus processes in a kinematic regime so far unexplored. We report on preliminary PHENIX results of J/Psi and high-mass e+e- photoproduction at mid-rapidity in coherent electromagnetic Au+Au interactions at sqrt(s_NN) = 200 GeV tagged with forward neutron emission from the Au* dissociation. 
David d'Enterria (for the PHENIX Collaboration)