2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41184Due to coherence, there are strong electromagnetic fields of short duration in very peripheral heavy ion collisions. They give rise to photon-photon and photon-nucleus collisions with high flux. Photon-photon and photon-hadron physics at various invariant mass scales are discussed.9 pages, 4 figures Proceedings of the Workshop on Electromagnetic Probes of Fundamental Physics, Oct. 16-21,2001, Erice, ItalyHigh Energy Physics - Phenomenologytext