Testing nucleon distribution amplitudes: Relations between neutron andN-Δform factors

The proton and neutron magnetic form factors, the axial-vector form factor, and the leading N-\ensuremath{\Delta} transition form factor are connected by the nucleon distribution amplitude. If the distribution-amplitude moments obey the QCD sum-rule results, a correlation exists between the neutron magnetic form factor ${G}_{\mathrm{Mn}}$ and the leading N-\ensuremath{\Delta} transition form factor. For existing proposed distribution amplitudes, one or the other of them will be small and the other not. We comment on what available data say.