Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-08-15
Phys.Lett.B338:84-91,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages LaTeX, 2 figures. Revision - minor typographic changes made
Scientific paper
10.1016/0370-2693(94)91348-X
In view of new precise measurements of the $\bar B\to D^*\ell \bar\nu$ decay rate near zero recoil, we reconsider the theoretical uncertainties in the extraction of $| V_{cb}|$ using heavy quark symmetry. In particular, we combine our previous estimate of $1/m_Q^2$ corrections to the normalization of the hadronic form factor at zero recoil with sum rules derived by Shifman {\it et al}. to obtain a new prediction with less theoretical uncertainty. We also summarize the status of the calculation of short-distance corrections, and of the slope of the form factor at zero recoil. We find ${\cal F}(1)=\eta_A \hat\xi(1)=0.93\pm 0.03$ and $\hat\varrho^2=0.7\pm 0.2$. Combining this with the most recent experimental results, we obtain the model-independent value $| V_{cb}|=0.040\pm 0.003$.
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