Improved light-cone sum rules for the electromagnetic form factors of the nucleon

Lenz, Alexander; Wittmann, Markus; Stein, Eckart

Abstract

We calculate the electromagnetic form factors of the nucleon within the light-cone sum rule approach. In comparison to previous work [Phys. Rev. D 65 (2002) 074011] 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.

Citation

Lenz, A., Wittmann, M., & Stein, E. (2004). Improved light-cone sum rules for the electromagnetic form factors of the nucleon. Physics Letters B, 581(3-4), 199-206. https://doi.org/10.1016/j.physletb.2003.12.009

• Journal Article Type: Article
• Acceptance Date: Dec 7, 2015
• Publication Date: Feb 1, 2004
• Deposit Date: Dec 7, 2015
• Publicly Available Date: Feb 24, 2016
• Journal: Physics Letters B
• Print ISSN: 0370-2693
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 581
• Issue: 3-4
• Pages: 199-206
• DOI: https://doi.org/10.1016/j.physletb.2003.12.009