## Abstract

We have measured the first and second moments of the hadronic mass-squared distribution in B→X_{c}lv, for P_{lepton}>1.5 GeV/c. We find(M_{X}^{2}−M_{D}^{−2})= 0.251 ± 0.66 GeV^{2},((M_{X}^{2}−M_{X}^{2})^{2})=0.576 ± 0.170 GeV^{4}, where M^{¯}_{D}is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b→s γ, we find the heavy quark effective theory parameter λ_{1}(in the modified minimal subtraction renormalization scheme, to order 1/M_{B}^{3}and γ_{0}α_{s}^{2}) to be −0.24±0.11GeV^{2}. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain|V_{cb}|=0.0404±0.0013.

Original language | English (US) |
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Journal | Physical review letters |

Volume | 87 |

Issue number | 25 |

DOIs | |

State | Published - Dec 3 2001 |

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