2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44337We investigate the structure of some first terms of Watson series representing the amplitude of lepton-pair production in the ion collisions. It is shown that infrared instabilities of individual terms trend to cancel each other providing the infrared stability of whole amplitude.LaTex, 6 pages, no figuresHigh Energy Physics - Phenomenologytext