2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109956Strictly working in the framework of the nonrelativistic quantum mechanics of a spin 1/2 particle coupled to an external electromagnetic field, we show, by explicit construction, the existence of a charge conjugation operator matrix which defines the corresponding antiparticle wave function and leads to the galilean and gauge invariant Schroedinger-Pauli equation satisfied by it.5 pagesHigh Energy Physics - Theorytext