Vector-to-vector-plus-pseudoscalar decay modes in perturbative QCD

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

DOI:https://doi.org/10.1103/PhysRevD.42.1577· OSTI ID:6423389

Irwin, B A; Margolis, B; Trottier, H D ^[1]

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1. Physics Department, McGill University, 3600 University Street, Montreal, Quebec (Canada)

We calculate branching ratios for the Okubo-Zweig-Iizuka-rule-suppressed decays of a flavor-neutral vector meson ({Upsilon},{ital J}/{psi}) into a vector meson plus a pseudoscalar meson, in perturbative QCD. The final mesons may be flavored or flavor neutral. The initial and final mesons are assumed to be nonrelativistic quark-antiquark bound states. The calculation is made to lowest order in strong coupling, and in the average relative momentum of the constituent quarks of each of the mesons. The only input parameters for our calculations are the strong coupling and the bound-state wave functions at the origin, which (for flavor-neutral mesons) are all determined from known hadronic and leptonic widths. Our calculations can therefore provide parameter-free tests of QCD, when applied to {Upsilon}-to-charmonium transitions, where the approximations are most reliable. Results for decays of the {ital J}/{psi} are in reasonable accord with the experimental data, taking into account the roughness of the approximations for the light final-state mesons.

• OSTI ID: 6423389
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BOUND STATE
BRANCHING RATIO
CHARMONIUM
COMPOSITE MODELS
DECAY
DIAGRAMS
ELEMENTARY PARTICLES
FEYNMAN DIAGRAM
FIELD THEORIES
FLAVOR MODEL
FUNCTIONS
HADRONS
HELICITY
MATHEMATICAL MODELS
MESONS
PARTIAL WAVES
PARTICLE MODELS
PARTICLE PROPERTIES
PERTURBATION THEORY
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
S WAVES
STRONG-COUPLING MODEL
VECTOR MESONS
WAVE FUNCTIONS