Determination of the Ckm Matrix Element |VCB| from Semileptonic B Decays

We report studies of semileptonic decays, B → X_cℓν, based on a sample of 88 million Bbar {B} events recorded with the BABAR detector. We have measured four moments of the electron energy distribution and four moments of the hadronic mass distribution, each as a function of the minimum electron energy. From these moments we determine the inclusive branching fraction, the CKM matrix element |V_cb|, and other heavy quark parameters, using Heavy Quark Expansions (HQE) to order 1/m_b³ in the kinetic mass scheme. In addition, we have studied a large sample of exclusive B⁰ → D*^-ℓ⁺ν decays. This sample is used to extract the vector and axial form factors, the normalization and slope of the HQET form factor to determine |V_cb|.