2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40840The present Standard Model prediction for muon g-2 is reviewed. Emphasis is put in discussing the main hadronic uncertainties at present.Invited talk at Kaon 2001, June 2001, Pisa (Italy), 8 pages. Revised version correcting the sign mistake in the hadronic light-by-light contributions and adding new references. The present discrepancy between the SM and experiment is (23.1 +- 16.9) 10^{-10}High Energy Physics - Phenomenologytext