Inclusive semileptonic B decays at BABAR

AbstractWe report updates on two analyses of inclusive semileptonic B decays based on a dataset of 89 million \(B\kern 0.18em\overline{\kern -0.18em B}\) events recorded with the BABAR detector at the Υ(4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other \({\ensuremath{\overline B}}\) meson. In the first analysis, the measurement of the first and second moment of the hadronic mass distribution in Cabibbo-favored \({\kern 0.18em\overline{\kern -0.18em B} \to X_c \ell \bar{\nu}}\) decays allows for the determination of the nonperturbative parameters \({\kern 0.2em\overline{\kern -0.2em\Lambda\kern 0.05em}\kern-0.05em}\) and λ1 of Heavy Quark Effective Theory (HQET) and |Vcb|. In the second analysis, the hadronic mass distribution is used to measure the inclusive charmless semileptonic branching fraction and to determine |Vub|.PACS: 13.20.He Decays of beauty mesons – 12.39.Hg Heavy quark effective theory