2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207793We consider the resonant production of fermions from an oscillating axial background. The classical evolution of the axial field is given by that of a massive pseudovector field, as suggested by the renormalizability of the theory. We look upon both the massive and the massless fermion production from a perturbative point of view. We obtain the corresponding spectrum and angular distributions for the different spins or helicities in the particular case of a spatial-like axial field. We also extend our study to the non-perturbative regime in the massless case and compare the results with the perturbative ones.16 pages, LaTeX, 12 figures; new comments and references added, version to appear in Phys. Rev. DHigh Energy Physics - PhenomenologyGeneral Relativity and Quantum Cosmologytext