2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37637The determination of the Vub element of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix plays a central role in testing the Standard Model (SM) interpretation of CP violation. Measurements at B-Factories are contributing with results that rely on different theoretical assumptions. Recent inclusive and exclusive results from CLEO, BaBar and BELLE are reviewed.6 pages, 4 figures, Talk given at IFAE 2003, Lecce, 23-26 april 2003High Energy Physics - Experimenttext