2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52136The Born--Infeld theory of a D3-brane intersecting with(p,q) strings is reconsidered. From the assumption that the electromagnetic fields are those of a dyon, and using the kappa invariance of the action, the explicit scalar field and its charge are derived. Considering perturbations orthogonal to both branes, the SL(2,Z)-invariant S-matrix is obtained. Owing to the selfduality of the brane the latter can be evaluated explicitly in both high and low energy regions.LaTex, 14 pages, no figuresHigh Energy Physics - Theorytext