It's a twenty-year-old question: how much do the constituent quarks and gluons contribute to the spin of a nucleon? New results from the COMPASS experiment add to the picture.
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Gabathuler, E. Where is the nucleon spin?. Nature Phys 2, 303–304 (2006). https://doi.org/10.1038/nphys302
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DOI: https://doi.org/10.1038/nphys302