2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52793The problem of construction of low-energy effective action in N=3 SYM theory is considered within the harmonic superspace (HSS) approach. The low-energy effective action is supposed to be a gauge- and scale-invariant functional in N=3 HSS reproducing the term F^4/ϕ^4 in components. This functional is found as a scale-invariant generalization of the F^4-term in N=3 supersymmetric Born-Infeld action.10 pages, talk given at QUARKS-2004, Pushkinskie Gory, Russia, May 24-30, 2004High Energy Physics - Theorytext