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.
| Original language | English (US) |
|---|---|
| Article number | 045211 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 82 |
| Issue number | 4 |
| DOIs | |
| State | Published - 2010 |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Role of mesons in the electromagnetic form factors of the nucleon. / Crawford, C.; Akdogan, T.; Alarcon, Ricardo; Bertozzi, W.; Booth, E.; Botto, T.; Calarco, J. R.; Clasie, B.; de Grush, A.; Donnelly, T. W.; Dow, K.; Farkhondeh, M.; Fatemi, R.; Filoti, O.; Franklin, W.; Gao, H.; Geis, E.; Gilad, S.; Hasell, D.; Karpius, P.; Kohl, M.; Kolster, H.; Lee, T.; Lomon, E.; Maschinot, A.; Matthews, J.; McIlhany, K.; Meitanis, N.; Milner, R.; Rapaport, J.; Redwine, R.; Seely, J.; Shinozaki, A.; Sindile, A.; Širca, S.; Six, E.; Smith, T.; Tonguc, B.; Tschalaer, C.; Tsentalovich, E.; Turchinetz, W.; Xiao, Y.; Xu, W.; Zhang, C.; Zhou, Z.; Ziskin, V.; Zwart, T.
In: Physical Review C - Nuclear Physics, Vol. 82, No. 4, 045211, 2010.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Role of mesons in the electromagnetic form factors of the nucleon
AU - Crawford, C.
AU - Akdogan, T.
AU - Alarcon, Ricardo
AU - Bertozzi, W.
AU - Booth, E.
AU - Botto, T.
AU - Calarco, J. R.
AU - Clasie, B.
AU - de Grush, A.
AU - Donnelly, T. W.
AU - Dow, K.
AU - Farkhondeh, M.
AU - Fatemi, R.
AU - Filoti, O.
AU - Franklin, W.
AU - Gao, H.
AU - Geis, E.
AU - Gilad, S.
AU - Hasell, D.
AU - Karpius, P.
AU - Kohl, M.
AU - Kolster, H.
AU - Lee, T.
AU - Lomon, E.
AU - Maschinot, A.
AU - Matthews, J.
AU - McIlhany, K.
AU - Meitanis, N.
AU - Milner, R.
AU - Rapaport, J.
AU - Redwine, R.
AU - Seely, J.
AU - Shinozaki, A.
AU - Sindile, A.
AU - Širca, S.
AU - Six, E.
AU - Smith, T.
AU - Tonguc, B.
AU - Tschalaer, C.
AU - Tsentalovich, E.
AU - Turchinetz, W.
AU - Xiao, Y.
AU - Xu, W.
AU - Zhang, C.
AU - Zhou, Z.
AU - Ziskin, V.
AU - Zwart, T.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=78649345931&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevC.82.045211
DO - 10.1103/PhysRevC.82.045211
M3 - Article
AN - SCOPUS:78649345931
VL - 82
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 4
M1 - 045211
ER -