Nucleon Spin Content from Elastic Form Factor Data

Details Nucleon Spin Content from Elastic Form Factor Data Nucleon Spin Content from Elastic Form Factor Data

1999-11-01

arxiv.org/abs/hep-ph/9910565v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 3 eps-figures, uses sprocl.sty. Invited talk at the INT/JLab Workshop `Exclusive and Semiexclusive Processes at High

Scientific paper

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 $G_{Mp}(Q^2)$ and recent JLab data for the ratio of the proton form factors $G_{Ep}/G_{Mp}$ at $Q^2\leq 3.5$ GeV$^2$. 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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