Nucleon Spin Content from Elastic Form Factor Data

1999/10/31 by Andrei Afanasev, Andrei V. Afanasev, Afanasev, Andrei V.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9910565

6 pages, 3 eps-figures, uses sprocl.sty. Invited talk at the INT/JLab Workshop `Exclusive and Semiexclusive Processes at High Momentum Transfer', Newport News, VA, May 20-22, 1999

arxiv created 1999/11/01 · openalex publication_date 1999/11/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

I use the formalism of skewed parton distributions (SPD) to describe elastic form factors of the nucleon. The results are consistent with approximate dipole behavior of G_Mp(Q²) and recent JLab data for the ratio of the proton form factors G_Ep/G_Mp at Q²≤ 3.5 GeV². Using the Angular Momentum Sum Rule, I obtain a numerical estimate for the valence quark contributions to the nucleon spin at the level of 50%, with their orbital angular momentum \it included. When combined with polarized DIS measurements, this result indicated that the orbital angular momentum of quarks contributes about 25% to the nucleon spin.

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