Evidence for the absence of gluon orbital angular momentum in the nucleon

Stanley J. Brodsky; Susan Gardner

doi:10.1016/j.physletb.2006.10.024

Evidence for the absence of gluon orbital angular momentum in the nucleon

Stanley J. Brodsky, Susan Gardner

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	22-28
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	643
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2006.10.024
State	Published - Nov 30 2006

Bibliographical note

Funding Information:
Work supported in part by the US Department of Energy under contracts DE-AC02-76SF00515 and DE-FG02-96ER40989.

Funding

Work supported in part by the US Department of Energy under contracts DE-AC02-76SF00515 and DE-FG02-96ER40989.

Funders	Funder number
U.S. Department of Energy EPSCoR	DE-FG02-96ER40989, DE-AC02-76SF00515

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2006.10.024

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abstract = "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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AU - Gardner, Susan

N1 - Funding Information: Work supported in part by the US Department of Energy under contracts DE-AC02-76SF00515 and DE-FG02-96ER40989.

PY - 2006/11/30

Y1 - 2006/11/30

N2 - 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.

AB - 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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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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Evidence for the absence of gluon orbital angular momentum in the nucleon

Abstract

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