Role of mesons in the electromagnetic form factors of the nucleon
Author(s)
Akdogan, Taylan
Bertozzi, William
Botto, Tancredi
Clasie, Benjamin Michael Patrick
DeGrush, Adam J.
Donnelly, T. William
Dow, Karen A.
Farkhondeh, Manouchehr
Fatemi, Renee
Franklin, Wilbur
Date Issued
October 2010
Journal
Physical review C
Publisher
American Physical Society
Citation
Crawford, C. et al. “Role of mesons in the electromagnetic form factors of the nucleon.” Physical Review C 82.4 (2010): n. pag. © 2010 The American Physical Society
Version
Final published version
Abstract
The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together with the asymptotic Q2 [Q superscript 2] behavior of perturbative QCD. Specifically, the vector dominance model (GKex) developed by E. L. Lomon is employed, as it is known to be very successful in representing the existing high-quality data published to date. An analysis is made of the experimental uncertainties present when the differences between the GKex model and the data are expanded in orthonormal basis functions. A main motivation for the present study is to provide insight into how the various ingredients in this model yield the measured behavior, including discussions of when dipole form factors are to be expected or not, of which mesons are the major contributors, for instance, at low Q2 [Q superscript 2] or large distances, and of what effects are predicted from coupling to the continuum. Such insights are first discussed in momentum space, followed by an analysis of how different and potentially useful information emerges when both the experimental and theoretical electric form factors are Fourier transformed to coordinate space. While these Fourier transforms should not be interpreted as “charge distributions,” nevertheless the roles played by the various mesons, especially those which are dominant at large or small distance scales, can be explored via such experiment–theory comparisons.
MIT Department
Bates Linear Accelerator Center
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevC.82.045211
