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Measurement of the form factors for B-bar0-->D*+

Using a sample of 2.6×10 6 ϒ(4S)→ B events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have measured the form factors for B 0 →D* + l - v . 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 andR2 = 0.71±0.22±0.07, and the form-factor slope ρ A1 2 = 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.