Semileptonic B and Lambda_b Decays and Local Duality in QCD

Abstract

The inclusive and exclusive semileptonic decay distributions for b -> c decay are computed in the Shifman-Voloshin limit. The inclusive decay distributions (computed using an operator product expansion) depend on quark masses, and the exclusive decay distributions depend on hadron masses. Nevertheless, we show explicitly how the first two terms in the 1/m expansion match between the inclusive and exclusive decays. Agreement between the inclusive and exclusive decay rates requires a minimum smearing region of size Lambda_QCD before local duality holds in QCD. The alpha_s corrections to the inclusive and exclusive decay rates are also shown to agree to order (log m)/m^2. The alpha_s/m^2 corrections are used to obtain the alpha_s correction to Bjorken's inequality on the slope of the Isgur-Wise function.

22 pages, 3 eps figures, uses revtex (Revision: a discussion of radiative corrections to the bound K>0 of Section 7.B has been added; some typos, including labels in fig 2)

References in corpus (4)

• Inclusive Semileptonic B and Polarized Lambda_b Decays from QCD
• Sum Rules for Heavy Flavor Transitions in the SV Limit
• Measurement of the B -> D^* l nu Branching Fractions and |Vcb|
• Hadron Spectra for Semileptonic Heavy Quark Decay

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