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

Related Subjects

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