Hunting for the Remaining Spin in the Nucleon

Details Hunting for the Remaining Spin in the Nucleon Hunting for the Remaining Spin in the Nucleon

1996-10-15

arxiv.org/abs/hep-ph/9610369v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, latex, no figures, talk presented at the 12th International Symposium on High-Energy Spin Physics, Amsterdam, Sept.,

Scientific paper

This talk consists of four parts. In part one, I give an elementary discussion on constructing a Lorentz-invariant spin sum rule for the nucleon. In part two, I discuss a gauge-dependent spin sum rule, explore its relation with the polarized gluon distribution, and introduce the complete evolution equation for the spin structure. In part three, I consider a gauge-invariant spin sum rule and the related evolution equation. The solution of the equation motivates the possibility that half of the nucleon spin may be carried by gluons at low energy scales. In the final part, I discuss deeply-virtual Compton scattering as a possible way to measure the canonical orbital angular momentum of quarks in the nucleon.

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