B decays in the upsilon expansion

Details B decays in the upsilon expansion B decays in the upsilon expansion

1998-11-04

arxiv.org/abs/hep-ph/9811239v1

Phys.Rev. D59 (1999) 074017

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages

Scientific paper

10.1103/PhysRevD.59.074017

Theoretical predictions for B decay rates are rewritten in terms of the Upsilon(1S) meson mass instead of the b quark mass, using a modified perturbation expansion. The theoretical consistency of this expansion is shown both at low and high orders. Our method improves the behavior of the perturbation series for semileptonic and nonleptonic inclusive decay modes, as well as for exclusive decay form factors. The results are applied to the determination of the semileptonic B branching ratio, charm counting, the ratio of B -> X tau nu and B -> X e nu decay rates, and form factor ratios in B -> D* e nu decay. We also comment on why it is not possible to separate perturbative and nonperturbative effects in QCD.

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