2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45125An helicity formalism for perturbative calculations is presented. It is based on the formal insertion in spinor lines of a complete set of states built up with unphysical spinors. It is particularly convenient when massive spinors are present. Its application to $e^+\,e^-\,\rightarrow b\,\bar b\,W^+W^-$ is briefly discussed.To appear in Proceedings Nonlinear Phenomena in Complex Systems. Polatsk Belarus. February 94 - 8 pages, 2 figs. using feynman.texHigh Energy Physics - Phenomenologytext