2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171659The calculation of partial decay rates in B --> X_u l nu decays at next-to-next-to-leading order (NNLO) in alpha_s and to leading order in 1/m_b is described. New results for the hard function are combined with known results for the jet function and shape-function moments in a numerical analysis which explores the impact of the NNLO corrections on partial decay rates and the determination of |V_{ub}|.Talk given at the 34th International Conference on High Energy Physics, Philadelphia, July 2008High Energy Physics - Phenomenologytext