On Nucleon Electromagnetic Form Factors: A Pre'cis
Nuclear Theory
2008-11-26 v1 High Energy Physics - Lattice
High Energy Physics - Phenomenology
Nuclear Experiment
Abstract
Electron scattering at large Q^2 probes a nucleon's quark core. This core's contribution to electromagnetic form factors may be calculated using Poincare' covariant Faddeev amplitudes combined with a nucleon-photon vertex that automatically fulfills a Ward-Takahashi identity for on-shell nucleons. The calculated behaviour of G_E^p(Q^2)/G_M^p(Q^2) on 2<Q^2(GeV^2)<6 agrees with that inferred from polarisation transfer data, and exhibits a zero at Q^2\approx 6.5 GeV^2. There is some evidence that F_2(Q^2)/F_1(Q^2) \propto [\ln(Q^2/\Lambda^2)]^2/Q^2 for Q^2>6 GeV^2.
Keywords
Cite
@article{arxiv.nucl-th/0501033,
title = {On Nucleon Electromagnetic Form Factors: A Pre'cis},
author = {A Hoell and R. Alkofer and M. Kloker and A. Krassnigg and C. D. Roberts and S. V. Wright},
journal= {arXiv preprint arXiv:nucl-th/0501033},
year = {2008}
}
Comments
Contribution to the proceedings of "Baryons 04," the 10th International Conference on the Structure of Baryons, 25-29/Oct./04, Ecole Polytechnique, Palaiseau; 5 pages, 3 figures