2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37570A preliminary measurement of the second moments of the hadron mass in B --> X l nu decays by the BABAR Collaboration is reported. These measurements are performed as a function of the lepton momentum above a given threshold.Invited Talk at rhe Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052)High Energy Physics - Experimenttext