2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204712An account is given of an interesting but unknown theory by Majorana regarding scalar quantum electrodynamics, elaborated several years before the known Pauli-Weisskopf theory. Theoretical calculations and their interpretation are given in detail, together with a general historical discussion of the main steps towards the building of a quantum field theory for electrodynamics. A possible peculiar application to nuclear constitution, as conceived around 1930, considered by Majorana is as well discussed.Latex, amsart, 20 pages, 2 figures; to be published in Annalen der PhysikHistory and Philosophy of PhysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext