Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-30
Phys. Rev. D 56 (1997) 2928
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, Latex, 3 eps figures included, published version (discussion extended, references updated, the main result unchanged
Scientific paper
10.1103/PhysRevD.56.2928
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.
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