Journal
PHYSICS LETTERS B
Volume 643, Issue 1, Pages 22-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2006.10.024
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The Sivers mechanism for the single-spin asymmetry in unpolarized lepton scattering from a transversely polarized nucleon is driven by the orbital angular momentum carried by its quark and gluon constituents, combined with QCD final-state interactions. Both quark and gluon mechanisms can generate such a single-spin asymmetry, though only the quark mechanism can explain the small single-spin asymmetry measured by the COMPASS Collaboration on the deuteron, suggesting the gluon mechanism is small relative to the quark mechanism. We detail empirical studies through which the gluon and quark orbital angular momentum contributions, quark-flavor by quark-flavor, can be elucidated. (c) 2006 Elsevier B.V. All rights reserved.
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