Chew, Geoffrey F. and Karplus, Robert and Gasiorowicz, Stephen and Zachariasen, Fredrik (1958) Electromagnetic structure of the nucleon in local-field theory. Physical Review, 110 (1). pp. 265-276. ISSN 0031-899X http://resolver.caltech.edu/CaltechAUTHORS:CHEpr58
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In analogy to the dispersion-relation method for scattering, the description of nucleon electromagnetic structure by local-field theory is discussed in terms of mass-spectral representations for the form factors. The existence of such representations is made plausible although not proved, and it is shown that the spectral distribution functions are related to scattering amplitudes on the mass shell but sometimes in a nonphysical region. It is argued that the main contributor to the magnetic moment structure in the spectral distribution must be the two-pion state, and an attempt is made to evaluate this contribution in terms of the known behavior of pion-nucleon scattering. A semiquantitative calculation yields results in reasonable agreement with experiment. It is emphasized that the large observed charge radius of the proton does not imply the dominance of the two-pion state in the charge structure. Thus it is not impossible that higher mass configurations supply the isotopic scalar charge needed to explain the small neutron-electron interaction.
|Additional Information:||©1958 The American Physical Society. Received 25 November 1957. We should like to thank M. L. Goldberger for advance communication of the results obtained by his group.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||10 Oct 2006|
|Last Modified:||26 Dec 2012 09:05|
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