TL;DR
This paper explores the relationship between two definitions of quark orbital angular momentum in nucleons, showing how final state interactions account for their differences within a Wigner distribution framework.
Contribution
It clarifies the connection between Ji and Jaffe-Manohar definitions of orbital angular momentum using Wigner distributions and interprets their difference as effects of final state interactions.
Findings
The difference between the two definitions is due to final state interactions.
Wigner distributions provide a unified framework for orbital angular momentum.
Final state interactions modify the quark orbital angular momentum during DIS.
Abstract
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 due to final state interactions as it leaves the target in a DIS experiment.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Nuclear physics research studies · Particle physics theoretical and experimental studies