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

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dc.creatorBrodsky, S. J.
dc.creatorGardner, S.
dc.date2006-08-19
dc.date2006-10-20
dc.date.accessioned2026-07-07T11:05:31Z
dc.date.available2026-07-07T11:05:31Z
dc.descriptionThe 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.
dc.description13 pages, clarifications and refs. added, version to appear in PLB
dc.identifierhttps://arxiv.org/abs/hep-ph/0608219
dc.identifierhttp://arxiv.org/abs/hep-ph/0608219
dc.identifierPhys.Lett.B643:22-28,2006
dc.identifierdoi:10.1016/j.physletb.2006.10.024
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189231
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleEvidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon
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