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Parton Orbital Angular Momentum and Final State Interactions
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Definitions of orbital angular momentum based on Wigner distributions are used as a framework to discuss the connection between the Ji definition of the quark orbital angular momentum and that of Jaffe and Manohar.We find that the difference between these two definitions can be interpreted as the change in the quark orbital angular momentum as it leaves the target in a DIS experiment. The mechanism responsible for that change is similar to the mechanism that causes transverse single-spin asymmetries in semi-inclusive deep-inelastic scattering.
Forward citations
Cited by 2 Pith papers
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Gluon contribution to the angular momentum distribution of a dressed quark state
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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Spin Structure of the Nucleon: Overview
A pedagogical review consolidates the proton spin decomposition into quark/gluon spin and orbital angular momentum, emphasizing gauge-invariant OAM definitions, small-x cancellations, and EIC observables.
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