Improved Light-Cone Sum Rules for the Electromagnetic Form Factors of the Nucleon

Abstract

We calculate the electromagnetic form factors of the nucleon within the light-cone sum rule approach. In comparison to previous work (hep-ph/0112085) we suggest to use a pure isospin-1/2 interpolating field for the nucleon, since the Chernyak-Zhitnitsky current leads to numerically large, unphysical, isospin violating contributions. The leading-order sum rules are derived for the form factors and the results are confronted with the experimental data. Our approach tends to favor the nucleon distribution amplitudes that are not far from the asymptotic shape.

10 pages, 5 figures

References in corpus (5)

• The Uses of Conformal Symmetry in QCD
• Perturbative QCD Analysis of the Nucleon's Pauli Form Factor F_2(Q^2)
• How well do we know the electromagnetic form factors of the proton?
• Nucleon electromagnetic form factors on the lattice and in chiral effective field theory
• Shapes of the Proton

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