2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49368The supersymmetric flavor problem is elegantly solved by the decoupling scenario, where the first-two generation sfermions are much heavier than the third generation ones. However, such a mass spectrum is not stable against renormalization group evolution and causes extreme fine-tuning of the electroweak symmetry breaking. We present a mechanism which stabilizes the mass spectrum with such a large splitting, by introducing extra vector-like chiral multiplets of masses comparable to the first-two generation sfermions. The explicit models are constructed in a framework of the anomalous U(1) SUSY-breaking model.12 pages, Latex, Talk given at International Symposium on Supersymmetry, Supergravity, and Superstring (SSS99), Seoul, Korea, June 1999High Energy Physics - Phenomenologytext