Nucleon Form Factors to Next-to-Leading Order with Light-Cone Sum Rules

Details Nucleon Form Factors to Next-to-Leading Order with Light-Cone Sum Rules Nucleon Form Factors to Next-to-Leading Order with Light-Cone Sum Rules

2008-05-12

arxiv.org/abs/0805.1758v2

Phys.Rev.D78:033009,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

68 pages, 9 figures; minor typos in the text corrected in accordance with the published version

Scientific paper

10.1103/PhysRevD.78.033009

We have calculated the leading-twist next-to-leading order (NLO), i.e., O(alpha_s), correction to the light-cone sum-rules prediction for the electromagnetic form factors of the nucleon. We have used the Ioffe nucleon interpolation current and worked in M_N=0 approximation, with M_N being the mass of the nucleon. In this approximation, only the Pauli form factor F_2 receives a correction and the calculated correction is quite sizable (cca 60%). The numerical results for the proton form factors show the improved agreement with the experimental data. We also discuss the problems encountered when going away from M_N=0 approximation at NLO, as well as, gauge invariance of the perturbative results. This work presents the first step towards the NLO accuracy in the light-cone sum rules for baryon form factors.

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