2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223016The non-relativistic scattering of a spin-1/2 particle off a self-dual monopole reduces, for large distances, to the dyon problem, studied previously by D'Hoker and Vinet. The S matrix (calculated by Zwanziger's algebraic method based on the o(3,1)\oplus o(3) dynamical symmetry, discovered by D'Hoker and Vinet) is shown to factorize into the product of the spinless S-matrix, S_0, with a spin-dependent factor. The total cross-section is identical to the one found in the spinless case.8 pages, no figures. Electronic version of a previously published paper. Neither the original text nor the list of references have been updatedHigh Energy Physics - Theorytext