Heavy-meson form factors from QCD sum rules

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.2451· OSTI ID:7114071

Neubert, M ^[1]

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1. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)

A consistent framework is developed for studying hadronic form factors of heavy mesons using QCD sum rules in the heavy-quark effective theory, including the next-to-leading-order renormalization-group improvement. Sum rules are derived for the asymptotic value of the meson decay constant {ital f}{sub {ital P}} and for the universal Isgur-Wise form factor. It is shown that renormalization-group effects considerably enhance the prediction for {ital f}{sub {ital P}} and bring its asymptotic value in accordance with recent lattice results. Including finite-mass corrections, the dependence of the physical decay constant on the meson mass is investigated. We obtain {ital f}{sub {ital D}}{congruent}170{plus minus}30 MeV and {ital f}{sub {ital B}}{congruent}190{plus minus}50 MeV. The origin of the breakdown of the heavy-quark expansion for {ital f}{sub {ital D}} is analyzed. In the case of heavy-meson transition form factors, both the QCD and 1/{ital m}{sub {ital Q}} corrections are moderate and under control. A sum rule for the renormalized Isgur-Wise function is derived and evaluated. The theoretical result is compared to experimental data.

• DOE Contract Number: AC03-76SF00515
• OSTI ID: 7114071
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 45:7; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
MESONS
FORM FACTORS
QUANTUM CHROMODYNAMICS
SUM RULES
BOUND STATE
DECAY
FEYNMAN DIAGRAM
GREEN FUNCTION
MASS
PERTURBATION THEORY
PROPAGATOR
PSEUDOSCALAR MESONS
RENORMALIZATION
SPIN
ANGULAR MOMENTUM
BOSONS
DIAGRAMS
ELEMENTARY PARTICLES
EQUATIONS
FIELD THEORIES
FUNCTIONS
HADRONS
PARTICLE PROPERTIES
QUANTUM FIELD THEORY
662230* - Quantum Chromodynamics- (1992-)
662350 - Decays of Mesons- (1992-)
662420 - Properties of Mesons & Meson Resonances- (1992-)