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.
Keywords
Cite
@article{arxiv.0805.1758,
title = {Nucleon Form Factors to Next-to-Leading Order with Light-Cone Sum Rules},
author = {K. Passek-Kumericki and G. Peters},
journal= {arXiv preprint arXiv:0805.1758},
year = {2009}
}
Comments
68 pages, 9 figures; minor typos in the text corrected in accordance with the published version