2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200302Ladder diagrams are relevant for the study of bound states. The condition upon the coupling strength for the existence of a bound state has been deduced in a scalar field theory for the case of low mass exchanges. We apply this approach to the case of very high mass exchanges.14 pages, 3 figuresHigh Energy Physics - Theorytext