Multipole expansion in quantum chromodynamics and the radiative decays J /. psi. r arrow. gamma. +. eta. and J /. psi. r arrow. gamma. +. pi. sup 0

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.2300· OSTI ID:6313241

Kuang, Yuping ^[1]; Yi, Yuping; Fu, Bing ^[2]

---

1. Stanford Linear Accelerator Center, Stanford University, Stanford, CA (USA) Chinese Center of Advanced Science and Technology (World Laboratory), Beijing (People's Republic of China) Department of Physics, Tsinghua University, Beijing (People's Republic of China) Institute of Theoretical Physics, Academia Sinica, Beijing (People's Republic of China)
2. Department of Physics, Tsinghua University, Beijing (People's Republic of China)

A generalized formalism of QCD multipole expansion including constituent-quark-field quantization is proposed. It can be applied to study soft-gluon emission processes of heavy-quark--antiquark systems with quark-flavor changing or quark pair annihilation. As an application, the radiative decays {ital J}/{psi}{r arrow}{gamma}+{eta} and {ital J}/{psi}{r arrow}{gamma}+{pi}{sup 0} are studied in this framework. It is shown that {ital J}/{psi}{r arrow}{gamma}+{eta} is dominated by a vector-meson-dominance mechanism in which the vector mesons are {ital n} {sup 3}{ital S}{sub 1} states of {ital c{bar c}} and the calculated rate is in agreement with the experiment. The decay {ital J}/{psi}{r arrow}{gamma}+{pi}{sup 0} is dominated by a different vector-meson-dominance mechanism in which the vector meson is {rho}{sup 0}.

• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6313241
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:7; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645202 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BOSONS
CHARMONIUM
COMPOSITE MODELS
COUPLING CONSTANTS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FLAVOR MODEL
FUNCTIONS
GAUGE INVARIANCE
GLUONS
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
J PSI-3097 MESONS
LAGRANGIAN FUNCTION
MATHEMATICAL MODELS
MATRICES
MESONS
PARTICLE MODELS
PARTICLE PRODUCTION
PIONS
PIONS NEUTRAL
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTIZATION
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
QUARKS
RADIATIVE DECAY
S MATRIX
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
VECTOR DOMINANCE MODEL
VECTOR MESONS
WEINBERG-SALAM GAUGE MODEL