2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54744We study a theory of particles interacting with strings. Considering such a theory for Type IIA superstring will give some clue about M-theory. As a first step toward such a theory, we construct the particle-particle-string interaction vertex generalizing the D-particle boundary state.9 pages, LaTex fileHigh Energy Physics - Theorytext