B Decays, an Introductory Survey

Details B Decays, an Introductory Survey B Decays, an Introductory Survey

1994-06-20

arxiv.org/abs/hep-ph/9406341v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, talk at the XXIXth Rencontre de Moriond, ``QCD and High Energy Hadronic Interactions'', march 1994, M\'eribel France

Scientific paper

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 $\Delta \Gamma$ in the $B_s-\overline B_s$ system. The popular factorization assumption is discussed and seems to be rather good.

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