## Abstract

Using a sample of 2.6 × 10^{6}ϒ(4S) → BB¯ events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have measured the form factors for B¯^{0} → D*+l^{−}ν¯. We perform a three-parameter fit with the joint distribution of four kinematic variables to obtain the form-factor ratios R_{1} = 1.18 ± 0.30 ± 0.12 and R_{2} = 0.71 ± 0.22 ± 0.07, and the form-factor slope ρ^{2} _{A1 } = 0.91 ± 0.15 ± 0.06, which is closely related to the slope of the Isgur-Wise function. The form-factor ratios are consistent with predicted corrections to the heavy-quark symmetry limit R_{1} = R_{2} = 1.

Original language | English (US) |
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Pages (from-to) | 3898-3902 |

Number of pages | 5 |

Journal | Physical review letters |

Volume | 76 |

Issue number | 21 |

DOIs | |

State | Published - May 20 1996 |