On Nucleon Electromagnetic Form Factors: A Pre'cis
A Hoell, R. Alkofer, M. Kloker, A. Krassnigg, C. D. Roberts, S. V. Wright
Abstract
Electron scattering at large Q2 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 GEp(Q2)/GMp(Q2) on 2<Q2(GeV2)<6 agrees with that inferred from polarisation transfer data, and exhibits a zero at Q2≈ 6.5 GeV2. There is some evidence that F2(Q2)/F1(Q2) [(Q2/Λ2)]2/Q2 for Q2>6 GeV2.
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