Abstract
A controversy has arisen as to how to define quark and gluon angular momentum, important in understanding the internal structure of the nucleon. For a review of the controversy, see [1]. I survey some of the ideas put forward and try to assess their physical implications.
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References
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Leader, E. The angular momentum controversy: What’s it all about and does it matter?. Phys. Part. Nuclei 44, 926–929 (2013). https://doi.org/10.1134/S1063779613060142
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DOI: https://doi.org/10.1134/S1063779613060142