Semileptonic decays [ital D][r arrow][pi]([rho])[ital e][nu] and [ital B][r arrow][pi]([rho])[ital e][nu] from QCD sum rules

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.3190· OSTI ID:6244100

Ball, P ^[1]

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1. Physik-Department, TU Muenchen, D-8046 Garching (Germany)

We investigate the semileptonic decays of [ital B] and [ital D] mesons into [pi] and [rho] mesons, respectively, by means of QCD sum rules. We find that for the vector form factors involved the pole dominance hypothesis is valid to good accuracy with pole masses in the expected range. Pole dominance, however, does not apply to the axial form factors which results in specific predictions for the predominant polarization of the [rho] meson and the shape of the lepton spectrum. For the total decay rates we find [Gamma]([ital [bar B]] [sup 0][r arrow][pi][sup +][ital e[minus]] [bar [nu]])=(5.1[plus minus]1.1)[vert bar][ital V][sub [ital u][ital b]][vert bar][sup 2][times]10[sup 12] s[sup [minus]1], [Gamma]([ital D][sup 0][r arrow][pi][sup [minus]][ital e+][nu])=(8.0[plus minus]1.7)[vert bar][ital V][sub [ital c][ital d]][vert bar][sup 2][times]10[sup 10] s[sup [minus]1], [Gamma]([ital [bar B]] [sup 0][r arrow][rho][sup +][ital e[minus]] [bar [nu]])=(1.2[plus minus]0.4)[vert bar][ital V][sub [ital u][ital b]][vert bar][sup 2][times]10[sup 13] s[sup [minus]1], and [Gamma]([ital D][sup 0][r arrow][rho][sup [minus]][ital e+][nu])=(2.4[plus minus]0.7)[vert bar][ital V][sub [ital c][ital d]][vert bar][sup 2][times]10[sup 9] s[sup [minus]1].

• OSTI ID: 6244100
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 48:7; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
SEMILEPTONIC DECAY
D MESONS
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
PIONS
POLARIZATION
QUANTUM CHROMODYNAMICS
STANDARD MODEL
SUM RULES
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED MESONS
DECAY
ELEMENTARY PARTICLES
EQUATIONS
FIELD THEORIES
HADRONS
MATHEMATICAL MODELS
MATRICES
MESONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
WEAK PARTICLE DECAY
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662230 - Quantum Chromodynamics- (1992-)
662240 - Models for Strong Interactions- (1992-)