Theoretical Aspects of Heavy Flavour Physics

Details Theoretical Aspects of Heavy Flavour Physics Theoretical Aspects of Heavy Flavour Physics

1997-11-19

arxiv.org/abs/hep-ph/9711386v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Plenary lecture presented at the XVIII International Symposium on Lepton-Photon Interactions, Hamburg, July 28th - August 1st

Scientific paper

I review the status of theoretical aspects of B-decays. The principal difficulty in interpreting the wealth of experimental data is the control of non-perturbative QCD effects, and the talk is focused on attempts to control these effects. Lattice results for the decay constants, B-$\bar B$ mixing and semileptonic form-factors are summarized. The discrepancy of the theoretical predictions and experimental measurements for the ratio of lifetimes $\tau(\Lambda_b)/\tau(B_0)$ is discussed, as well as the status of the semileptonic branching ratio of the B-meson. The difficulties in making quantitative predictions for exclusive nonleptonic decays are stressed, and some recent approaches to this problem are outlined.

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