Role of mesons in the electromagnetic form factors of the nucleon
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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.
Published Version (Please cite this version)10.1103/PhysRevC.82.045211
Publication InfoCrawford, 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.
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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