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Physics of Gluon Helicity Contribution to Proton Spin

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arxiv 1304.6708 v1 pith:TPOZKDLV submitted 2013-04-24 hep-ph

Xiangdong Ji , Jian-Hui Zhang , Yong Zhao This is my paper · ORCID
classification hep-ph
keywords gluonhelicityprotonspincalculationcontributiondoorexpressions
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abstract

The total gluon helicity in a polarized proton, measurable in high-energy scattering, is shown to be the large momentum limit of a gauge-invariant but non-local, frame-dependent gluon spin $\vec{E}\times \vec{A}_\perp$ in QCD. This opens a door for a non-perturbative calculation of this quantity in lattice QCD, and also justifies using free-field expressions in the light-cone gauge as physical observables.

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  1. Gluon contribution to the angular momentum distribution of a dressed quark state

    hep-ph 2024-11 accept novelty 6.0 of 10

    Gluon angular momentum densities in a dressed quark model are computed for canonical, kinetic, and Belinfante decompositions, and the spin sum rule is verified.

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