2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179871I discuss the results for $|V_{ub}|f_+(0)$ and $|V_{ub}|$ obtained from the spectrum of $B\toπe ν$ and the form factor $f_+(q^2)$ from QCD sum rules on the light-cone and unquenched lattice calculations; the shape of $f_+(q^2)$ is fixed from experimental data.Proceedings of FPCP07, Bled, SloveniaHigh Energy Physics - Phenomenology|V_{ub}| from the Spectrum of B->pi e nutext