Electromagnetic leptonic decays and structure of light mesons
Journal Article
·
· Sov. Phys. - Usp. (Engl. Transl.); (United States)
Recent experimental and theoretical data on the rare electromagnetic conversion decays of light mesons (A..-->..B..gamma../sub V/..-->..Bl/sup +/l/sup -/) are reviewed. In these decays, the photon is a virtual photon (..gamma../sub V/) and converts into a lepton pair l/sup +/l/sup -/. Study of the effective-mass spectrum of the lepton pairs reveals the dynamic transition form factor F/sub AB/ (q/sup 2/ = m/sup 2//sub l//sup +/l/sup -/), which characterizes the electromagnetic structure of the A..-->..B transition vertex. Such studies have been undertaken for the decays ..pi../sup 0/..-->..e/sup +/e/sup -/..gamma.., eta..--> mu../sup +/..mu../sup -/..gamma.., eta'..--> mu../sup +/..mu../sup -/..gamma.., ..omega --> pi../sup 0/..mu../sup +/..mu../sup -/, and several similar processes. Analysis of the results reveals that the general behavior of the transition form factors of the neutral mesons agrees with vector dominance and with various versions of the quark model. There are, on the other hand, some quantitative deviations from vector dominance in the decays ..pi../sup 0/..-->..e/sup +/e/sup -/..gamma.. and ..omega --> pi../sup 0/..mu../sup +/..mu../sup -/. Data on the electromagnetic leptonic processes of higher orders, such as the decays eta..--> mu../sup +/..mu../sup -/ and ..pi../sup 0/..-->..e/sup +/e/sup -/, and their relationship with the structure of mesons are discussed. Various experimental searches are also discussed. The future outlook for such research is assessed.
- Research Organization:
- Institute of High-Energy Physics, Serpukhov
- OSTI ID:
- 6160867
- Journal Information:
- Sov. Phys. - Usp. (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Usp. (Engl. Transl.); (United States) Vol. 28:6; ISSN SOPUA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
DECAY
DOCUMENT TYPES
ELECTRON PAIRS
ELEMENTARY PARTICLES
FORM FACTORS
HADRONS
INTERACTIONS
LEPTONIC DECAY
MATHEMATICAL MODELS
MESONS
MUON PAIRS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUARK MODEL
RADIATIVE DECAY
REVIEWS
VECTOR DOMINANCE MODEL
WEAK INTERACTIONS
WEAK PARTICLE DECAY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
DECAY
DOCUMENT TYPES
ELECTRON PAIRS
ELEMENTARY PARTICLES
FORM FACTORS
HADRONS
INTERACTIONS
LEPTONIC DECAY
MATHEMATICAL MODELS
MESONS
MUON PAIRS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUARK MODEL
RADIATIVE DECAY
REVIEWS
VECTOR DOMINANCE MODEL
WEAK INTERACTIONS
WEAK PARTICLE DECAY