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arXiv · 0805.1758

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

K. Passek-Kumericki·G. Peters
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Abstract

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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K. Passek-Kumericki, G. Peters. 2009-02-18. Nucleon Form Factors to Next-to-Leading Order with Light-Cone Sum Rules. https://doi.org/10.1103/physrevd.78.033009

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