## Abstract

We present a measurement of the branching fraction for the semileptonic B decay B ^{o} → D^{+}ℓ^{-}v, where ℓ^{-}can be either an electron or a muon. We find Γ( ^{o} → D^{+}ℓ^{-}v) = (13.79 ± 0.76 ± 2.51) ns^{-1}, and the resulting branching fraction B( ^{0}→ D^{+}ℓ^{-}v) = (2.13 ± 0.12 ± 0.39)%, where the first error is statistical and the second systematic. We also investigate the B^{o} → D^{+}ℓ^{-}v form factor and the implications of the result for |V_{Cb}|. From a fit to the differential decay distribution we obtain the rate normalization |V _{Cb}| F_{D}(1) = (4.11 ± 0.44 ± 0.52) x 10 ^{-2}. Using a theoretical calculation of F_{D}(1), the Cabibbo-Kobayashi-Maskawa matrix element | V_{cb}| = (4.19 ± 0.45 ± 0.53 ± 0.30) x 10^{-2} is obtained, where the last error comes from the theoretical uncertainty of F_{D}(1). The results are based on a data sample of 10.2 fb^{-1} recorded at the γ(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider.

Original language | English |
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Pages (from-to) | 258-268 |

Number of pages | 11 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 526 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - 2002 |

Externally published | Yes |

## Keywords

- B decay
- CKM matrix
- Semileptonic

## ASJC Scopus subject areas

- Nuclear and High Energy Physics

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