Theoretical Uncertainties in the Extraction of $|V_{cb}|$ from $\bar B\to D^*\ell\,\barν$ Decays near Zero Recoil
| dc.creator | Neubert, Matthias | |
| dc.date | 1994-09-14 | |
| dc.date | 1994-09-16 | |
| dc.date.accessioned | 2026-07-07T09:00:05Z | |
| dc.date.available | 2026-07-07T09:00:05Z | |
| dc.description | I discuss the theoretical uncertainties in the extraction of $|\,V_{cb}|$ from a measurement of the $\bar B\to D^*\ell\,\barν$ 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 $\widehatξ(w)$ at zero recoil: $\widehat\varrho^2=0.7\pm 0.2$. Using the most recent experimental results, I obtain the model-independent value $|\,V_{cb}|=0.0395\pm 0.0030$. | |
| dc.description | invited talk presented at the 27th International Conference on High Energy Physics, Glasgow, Scotland, July 1994, 9 pages LaTeX, 1 figure appended after \end{document}, CERN-TH.7396/94 | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9409306 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9409306 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/147932 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Theoretical Uncertainties in the Extraction of $|V_{cb}|$ from $\bar B\to D^*\ell\,\barν$ Decays near Zero Recoil | |
| dc.type | text |