QCD Calculations of Decays of Heavy Flavor Hadrons

Details QCD Calculations of Decays of Heavy Flavor Hadrons QCD Calculations of Decays of Heavy Flavor Hadrons

2008-01-04

arxiv.org/abs/0801.0675v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited plenary talk delivered at the 23rd International Symposium on Lepton and Photon Interactions at High Energy (Daegu, Ko

Scientific paper

Precision tests of the Standard Model and searches for New Physics in the quark flavor sector depend on accurate theoretical calculations of decay rates and spectra for rare, flavor-changing processes. The theoretical status and recent developments of techniques allowing such calculations are reviewed. Special attention is paid to the calculation of the B->Xs+gamma branching ratio, the extraction of the b-quark mass from a fit to B->Xc+l+nu moments, and the determination of |V(ub)| from spectra in the inclusive decay B->Xu+l+nu. From a reanalysis of different inclusive distributions the updated average value |V(ub)|=(3.98+-0.15+-0.30)*10^{-3} is derived. Using only the theoretically cleanest channels, we obtain |V(ub)|=(3.70+-0.15+-0.28)*10^{-3}.

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