B Decays, an Introductory Survey
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
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.
9 pages, talk at the XXIXth Rencontre de Moriond, ``QCD and High Energy Hadronic Interactions'', march 1994, Méribel France
9 pages, talk at the XXIXth Rencontre de Moriond, ``QCD and High Energy Hadronic Interactions'', march 1994, Méribel France