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Extraction of the. pi. NN form factor from charged pion photoproduction

Journal Article · · Phys. Rev., C; (United States)
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The ..pi..NN form factor F/sub piN/N (t), at small values of the momentum transfer, 0 pi../sup +/n for incident photon energies in the range 3.4 --18 GeV. A total of 104 unpolarized differential cross sections and 22 asymmetries have been fitted with a Reggeized one-pion-exchange model. The best fits give for a monopole vertex function a range ..lambda..approx. =1000 MeV and for a dual model type of form factor, an asymptotic rate parameter ..beta..approx. =2.3--2.5. These results are consistent with those of a recent analysis of NN charge exchange scattering data at high energy and the same range of momentum transfers. The contribution of non-one-pion exchanges to the photoproduction amplitudes has been found to be negligible and does not affect the chi/sup 2/, thus leading to an essentially model-independent extraction of F/sub piN/N (t). The implications of these results for the construction of one-pion-exchange potentials in nuclear physics is briefly discussed.
Research Organization:
Department of Physics, Texas AandM University, College Station, Texas 77843
OSTI ID:
5459086
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645206 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. = 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ASYMMETRY
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
BOSON-EXCHANGE MODELS
BOSONS
CHARGE-EXCHANGE INTERACTIONS
CHIRAL SYMMETRY
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORM FACTORS
FUNCTIONS
GEV RANGE
GEV RANGE 01-10
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NEUTRON SPECTRA
NEUTRONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
OBE MODEL
OPE MODEL
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PERIPHERAL MODELS
PHASE SHIFT
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PION-NUCLEON INTERACTIONS
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
SCATTERING AMPLITUDES
SPECTRA
STRONG INTERACTIONS
SYMMETRY
SYMMETRY BREAKING
THREE-BODY PROBLEM
VERTEX FUNCTIONS