2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161059We present selected new results on leptonic B meson decays from the BaBar experiment: searches for the decays B0->l+l-, B+->l+nu and B0->l+tau-, and B->Knunubar, where l=e or mu. The decay modes imply also their charge conjugations. We observe no evidence for these decays and set upper limits on their branching fractions.6 pages, 14 figures, proceedings for Moriond EW 2008High Energy Physics - Experimenttext