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

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.

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

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• The Nucleon Distribution Amplitudes and their application to nucleon form factors and the $N\to \Delta$ transition at intermediate values of $Q^2$
• Two-loop renormalization of three-quark operators in QCD
• The nucleon wave function at the origin
• Higher twist nucleon distribution amplitudes in Wandzura-Wilczek approximation
• Probing the anomalous electromagnetic dipole moments of the top quark in $\gamma p$ collision at the LHC, the HL-LHC and the HE-LHC
• Baryon octet distribution amplitudes in Wandzura-Wilczek approximation
• Light-cone sum rule approach for Baryon form factors