QCD-based interpretation of the lepton spectrum in inclusive [ital [bar B]][r arrow][ital X][sub [ital u]l][bar [nu]] decays
- Theory Division, CERN, CH-1211 Geneva 23 (Switzerland)
We present a QCD-based approach to the end-point region of the lepton spectrum in [ital [bar B]][r arrow][ital X][sub [ital u]l][bar [nu]] decays. A genuinely nonperturbative form factor, the shape function, which describes the falloff of the spectrum close to the end point. The moments of this function are related to forward scattering matrix elements of local, higher-dimension operators. We find that nonperturbative effects are dominant over a finite region in the lepton energy spectrum, the width of which is related to the kinetic energy of the [ital b] quark inside the [ital B] meson. Applications of our method to the extraction of fundamental standard model parameters, among them [ital V][sub [ital u][ital b]], are discussed.
- OSTI ID:
- 5018817
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Vol. 49:7; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTI-B NEUTRAL MESONS
SEMILEPTONIC DECAY
ENERGY SPECTRA
QUANTUM CHROMODYNAMICS
LEPTONS
FORM FACTORS
INCLUSIVE INTERACTIONS
KINETIC ENERGY
MATRIX ELEMENTS
SCATTERING AMPLITUDES
STANDARD MODEL
AMPLITUDES
B MESONS
B NEUTRAL MESONS
BEAUTY PARTICLES
BOSONS
DECAY
ELEMENTARY PARTICLES
ENERGY
FERMIONS
FIELD THEORIES
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
SPECTRA
UNIFIED GAUGE MODELS
WEAK PARTICLE DECAY
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