A fresh look at the determination of |Vcb| from B → D⁎lν

We use recent Belle results on B¯0→D⁎+l−ν¯l decays to extract the CKM element |Vcb| with two different but well-founded parameterizations of the form factors. We show that the CLN and BGL parameterizations lead to quite different results for |Vcb| and provide a simple explanation of this unexpected behaviour. A long lasting discrepancy between the inclusive and exclusive determinations of |Vcb| may have to be thoroughly reconsidered.