2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185544We construct the first three family N=1 supersymmetric string model with Standard Model gauge group SU(3)_C x SU(2)_L x U(1)_Y from an orientifold of type IIA theory on T^6/(Z_2 x Z_2) and D6-branes intersecting at angles. In addition to the minimal supersymmetric Standard Model particles, the model contains right-handed neutrinos, a chiral (but anomaly-free) set of exotic multiplets, and extra vector-like multiplets. We discuss some phenomenological features of this model.4 pages, minor typos correctedHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext