We derive light-cone sum rules for the electromagnetic nucleon form factors
including the next-to-leading-order corrections for the contribution of
twist-three and twist-four operators and a consistent treatment of the nucleon
mass corrections. The essence of this approach is that soft Feynman
contributions are calculated in terms of small transverse distance quantities
using dispersion relations and duality. The form factors are thus expressed in
terms of nucleon wave functions at small transverse separations, called
distribution amplitudes, without any additional parameters. The distribution
amplitudes, therefore, can be extracted from the comparison with the
experimental data on form factors and compared to the results of lattice QCD
simulations. A selfconsistent picture emerges, with the three valence quarks
carrying 40%:30%:30% of the proton momentum.Comment: 27 pages, 7 figures uses revte
