2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54796In the framework of the worldline path integral approach to QFTH we discuss spin and relativistic couplings, in particular Yukawa and axial couplings to spin 1/2, and the case of spin 1 in the loop.8 pages, standard Latex, no figures, talk given by M.G. Schmidt at the International Seminar and Conference on Path Integrals, Dubna, Russia, 27 - 31 May 1996High Energy Physics - Theorytext