Nonperturbative QCD Contributions to the Semileptonic Decay Width of the B Meson

Abstract

Nonperturbative QCD contributions to the inclusive semileptonic decay of the B meson consist of the dynamic and kinematic components. We calculate the decay width in an approach based on the light-cone expansion and the heavy quark effective theory, which is able to include both components of nonperturbative QCD contributions. The kinematic component results in the phase-space extension and is shown to be quantitatively crucial, which could increase the decay width significantly. We find that the semileptonic decay width is enhanced by long-distance strong interactions by +(9\pm 6)%. This analysis is used to determine the CKM matrix element |V_{cb}| with a controlled theoretical error. Implications of the phase-space effects for the nonleptonic decay widths of b hadrons are briefly discussed. The experimental evidence for the phase-space effects is pointed out.

16 pages, Latex, 3 eps figures included, published version (discussion extended, references updated, the main result unchanged)

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Cited by in corpus (10)

• Nonspectator Effects and B Meson Lifetimes from a Field-theoretic Calculation
• Calculation of the semileptonic decay width of the ${\Lambda }_b$ baryon
• Motion of b-quark inside B meson: the Parton Model vs. the ACCMM Model
• Semi-Inclusive B\to K(K^*) X Decays with Initial Bound State Effects
• Determining |V_{ub}| from the sum rule for semileptonic B decay
• Extracting |V_{ub}| from the inclusive charmless semileptonic branching ratio of b hadrons
• Analysis of hadronic invariant mass spectrum in inclusive charmless semileptonic B decays
• Higher twist corrections to the sum rule for semileptonic B decay
• Semi-inclusive nonleptonic decays B\to D_s^{(*)} X
• |V_{cb}| and |V_{ub}| Determinations from Inclusive Semileptonic B Decays