Theoretical Uncertainties in the Extraction of $|V_{cb}|$ from $\bar B\to D^*\ell\,\barν$ Decays near Zero Recoil

Details Theoretical Uncertainties in the Extraction of $|V_{cb}|$ from $\bar B\to D^*\ell\,\barν$ Decays near Zero Recoil Theoretical Uncertainties in the Extraction of $|V_{cb}|$ from $\bar B\to D^*\ell\,\barν$ Decays near Zero Recoil

1994-09-14

arxiv.org/abs/hep-ph/9409306v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

invited talk presented at the 27th International Conference on High Energy Physics, Glasgow, Scotland, July 1994, 9 pages LaTe

Scientific paper

I discuss the theoretical uncertainties in the extraction of $|\,V_{cb}|$ from a measurement of the $\bar B\to D^*\ell\,\bar\nu$ decay rate close to zero recoil. In particular, I combine previous estimates of the $1/m_Q^2$ 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 uncertainty. I also give a prediction for the slope of the form factor $\widehat\xi(w)$ at zero recoil: $\widehat\varrho^2=0.7\pm 0.2$. Using the most recent experimental results, I obtain the model-independent value $|\,V_{cb}|=0.0395\pm 0.0030$.

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