Measurement and interpretation of moments in inclusive semileptonic decays B̄→Xc -ν̄

We present results for the moments of observed spectra in inclusive semileptonic B-meson decays to charm hadrons B →X_cl^-ν . Moments of the hadronic-mass and the combined mass-and-energy spectra for different minimum electron or muon momenta between 0.8 and 1.9  GeV/c are obtained from a sample of 232×10^6 Υ(4S)→BB events, collected with the BABAR detector at the PEP-II asymmetric-energy B-meson factory at SLAC. We also present a reevaluation of the moments of electron-energy spectra and partial decay fractions B(B →X_ce^-ν ) for minimum electron momenta between 0.6 and 1.5  GeV/c based on a sample of 51×10^6 Υ(4S)→BB events. The measurements are used for the extraction of the total decay fraction, the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V_(cb)|, the quark masses m_b and m_c, and four heavy-quark QCD parameters in the framework of a Heavy-Quark Expansion (HQE). We find B(B →X_cl^-ν )=(10.64±0.17±0.06)% and |V_(cb)|=(42.05±0.45±0.70)×10^(-3).