Electromagnetic form factors of hadrons

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1976

DOI:https://doi.org/10.2172/4083035· OSTI ID:4083035

Zidell, Vaughn Stephen ^[1]

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1. Iowa State Univ., Ames, IA (United States)

A vector meson dominance model of the electromagnetic form factors of hadrons is developed which is based on the use of unstable particle propagators. Least-square fits are made to the proton, neutron, pion and kaon form factor data in both the space and time-like regions. A good fit to the low-energy nucleon form factor data is obtained using only ρ, ω, and phi dominance, and leads to a determination of the vector meson resonance parameters in good agreement with experiment. The nucleon-vector meson coupling constants obey simple sum rules indicating that there exists no hard core contribution to the form factors within theoretical uncertainties. The prediction for the electromagnetic radii of the proton is in reasonable agreement with recent experiments. The pion and kaon charge form factors as deduced from the nucleon form factors assuming vector meson universality are compared to the data. The pion form factor agrees with the data in both the space and time-like regions. The pion charge radius is in agreement with the recent Dubna result, but the isovector P-wave pion-pion phase shift calculated from the theory disagrees with experiment. A possible contribution to the form factors from a heavy rho meson is also evaluated.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: US Energy Research and Development Administration (ERDA)
• DOE Contract Number: W-7405-ENG-82
• NSA Number: NSA-33-021367
• OSTI ID: 4083035
• Report Number(s): IS-T--706
• Country of Publication: United States
• Language: English

Related Subjects

*HADRONS-- ELECTROMAGNETIC FORM FACTORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING CONSTANTS
KAONS
MATHEMATICAL SPACE
NEUTRONS
OMEGA-784 RESONANCES
P WAVES
PARTICLE RADII
PHASE SHIFT
PHI-1019 RESONANCES
PIONS
PROPAGATOR
PROTONS
RHO-765 RESONANCES
SUM RULES
TIME DEPENDENCE
VECTOR DOMINANCE MODEL
VECTOR MESONS