## Abstract

This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}| from the decay B0→D⊃* ^{-}ℓ^{+}ν_{ℓ} using 711fb^{-1} of Belle data collected near the Υ(4S) resonance. We simultaneously measure the product of the form factor normalization F(1) and the matrix element |V _{cb}| as well as the three parameters ρ2, R_{1}(1) and R_{2}(1), which determine the form factors of this decay in the framework of the heavy quark effective theory. The results, based on about 120000 reconstructed B0→D⊃* ^{-}ℓ^{+}ν_{ℓ} decays, are ρ2=1.214±0.034±0.009, R_{1}(1)=1.401±0. 034±0.018, R_{2}(1)=0.864±0.024±0.008 and F(1)|V_{cb}|=(34.6±0.2±1.0)×10^{-3}. The branching fraction of B0→D⊃* ^{-}ℓ^{+}ν_{ℓ} is measured at the same time; we obtain a value of B(B0→D⊃* ^{-}ℓ^{+}ν_{ℓ})=(4.58±0.03±0. 26)%. The errors correspond to the statistical and systematic uncertainties. These results give the most precise determination of the form factor parameters and F(1)|V_{cb}| to date. In addition, a direct, model-independent determination of the form factor shapes has been carried out.

Original language | English |
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Article number | 112007 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 82 |

Issue number | 11 |

DOIs | |

Publication status | Published - 2010 Dec 30 |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)

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