Vector resonances and electromagnetic nucleon structure
- Continuous Electron Beam Accelerator Facility, Newport News, Virginia 23606 (United States)
Motivated by new, precise magnetic proton form factor data in the timelike reigon, a hybrid vector meson dominance (hVMD) formalism is employed to investigate the significance of excited vector meson rsonances on electromagnetic nucleon structure. We find that the [rho](1700), [omega](1600), and two previously unobserved states are required to reproduce the local structure seen in the new LEAR data just above the [ital p[bar p]] threshold. We also investigate sensitivity to the [phi] meson. The model dependence of our result is tested by introducing an alternative model which couples the isoscalar vector meson states to a hypothetical vector glueball resonance. We obtain nearly identical results from both models, except for [ital G][sub [ital E]][sup [ital n]]([ital q][sup 2]) in the spacelike region which is very sensitive to the glueball mass and the effective [phi][ital NN] coupling.
- OSTI ID:
- 6603730
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Vol. 51:2; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NUCLEONS
ELECTROMAGNETIC FORM FACTORS
VECTOR MESONS
RESONANCE
MOMENTUM TRANSFER
QUANTUM CHROMODYNAMICS
SENSITIVITY
VECTOR DOMINANCE MODEL
BARYONS
BOSONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FORM FACTORS
HADRONS
MATHEMATICAL MODELS
MESONS
PARTICLE MODELS
PARTICLE PROPERTIES
QUANTUM FIELD THEORY
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