2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95200The most general spin structures of the spin-1/2 baryon and spinless meson production operator for both photon and nucleon induced reactions are derived from the partial-wave expansions of these reaction amplitudes. The present method provides the coefficients multiplying each spin operator in terms of the partial-wave matrix elements. The result should be useful in studies of these reactions based on partial-wave analyses, especially, when spin observables are considered.RevTex 34 pages, revised versionNuclear Theorytext