Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.152005
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Funding
- U.S. Department of Energy [DE-FG02-93ER-40762, DE-AC02-05CH11231]
- Office of Science and Technology in Shanghai Municipal Government [11DZ2260700]
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We present a systematic study of the proton spin structure in terms of measurable parton distributions. For a transversely polarized proton, we derive a polarization sum rule from the leading generalized parton distributions appearing in hard exclusive processes. For a longitudinally polarized proton, we obtain a helicity decomposition from well-known quark and gluon helicity distributions and orbital angular-momentum contributions. The latter are shown to be related to measurable subleading generalized parton distributions and quantum-phase space Wigner distributions.
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