Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon

Details Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon

2006-08-19

arxiv.org/abs/hep-ph/0608219v2

Phys.Lett.B643:22-28,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, clarifications and refs. added, version to appear in PLB

Scientific paper

10.1016/j.physletb.2006.10.024

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.

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