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B Decays, an Introductory Survey

A. Le Yaouanc·L Oliver·O. Pène·J. -C. Raynal
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Abstract

To start the $b$-decay session we briefly introduce and comment some important theoretical tools which are currently used in $b$ physics. Heavy Quark Symmetry and its consequences for heavy to heavy and heavy to light semi-leptonic decays, as well as for leptonic decays, are briefly summarised. It is stressed that symmetry must be completed with dynamical calculations. A critical discussion of the nearest pole dominance (VMD) assumption is performed. Parton model and its higher twist corrections are discussed on the example of lifetimes. Finally non-leptonic decays are considered via the example of the exclusive calculation of $ΔΓ$ in the $B_s-\overline B_s$ system. The popular factorization assumption is discussed and seems to be rather good.

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A. Le Yaouanc, L Oliver, O. Pène, J. -C. Raynal. 1994-06-21. B Decays, an Introductory Survey. https://arxiv.org/abs/hep-ph/9406341

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