Theoretical Uncertainties in the Extraction of |V_cb| from B→ D^*ℓ ν Decays near Zero Recoil

1994/09/14 by Matthias Neubert, Neubert, Matthias
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9409306

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

arxiv created 1994/09/16 · arxiv updated 2009/11/30

Abstract

I discuss the theoretical uncertainties in the extraction of | V_cb| from a measurement of the B→ D^*ℓ ν decay rate close to zero recoil. In particular, I combine previous estimates of the 1/m_Q² 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\varrho²=0.7± 0.2. Using the most recent experimental results, I obtain the model-independent value | V_cb|=0.0395± 0.0030.

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