Role of mesons in the electromagnetic form factors of the nucleon
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 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 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. © 2010 The American Physical Society.
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https://hdl.handle.net/10161/4269Published Version (Please cite this version)
10.1103/PhysRevC.82.045211Publication Info
Crawford, C; Akdogan, T; Alarcon, R; Bertozzi, W; Booth, E; Botto, T; ... Zwart, T (2010). Role of mesons in the electromagnetic form factors of the nucleon. Physical Review C - Nuclear Physics, 82(4). pp. 45211. 10.1103/PhysRevC.82.045211. Retrieved from https://hdl.handle.net/10161/4269.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
Haiyan Gao
Henry W. Newson Distinguished Professor of Physics
Prof. Gao's research focuses on understanding the structure of the nucleon in terms
of quark and gluon degrees of freedom of Quantum Chromodynamics (QCD), search for
QCD exotics, and fundamental symmetry studies at low energy to search for new physics
beyond the Standard Model of electroweak interactions. Most recently, her group's
studies of the structure of the nucleon have been focusing on a precision measurement
of the proton (see

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