2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177810Ultraperipheral collisions at heavy ion colliders use the strong Coulomb fields surrounding the ions to study photon-photon and photon-hadron processes at high energy. A number of processes of interest are discussed here.12 pages, Talk presented at "Physics at LHC", Vienna, Austria, July 13-17, 2004. To be published in Czechoslovak Journal of PhysicsHigh Energy Physics - Phenomenologytext