Nonperturbative QCD contributions to the semileptonic decay width of the B meson

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.2928· OSTI ID:538718

Jin, C ^[1]

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1. Sektion Physik, Universitaet Muenchen, Theresienstrasse 37, D-80333 Muenchen (Germany)

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 light-cone expansion and 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{plus_minus}6){percent}. This analysis is used to determine the CKM (Cabibbo-Kobayashi-Maskawa) matrix element {vert_bar}V{sub cb}{vert_bar} 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538718
• Journal Information: Physical Review, D, Vol. 56, Issue 5; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
QUANTUM CHROMODYNAMICS
SEMILEPTONIC DECAY
B MESONS
WIDTH
INCLUSIVE INTERACTIONS
LIGHT CONE
PHASE SPACE
KOBAYASHI-MASKAWA MATRIX
MATRIX ELEMENTS