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Particle physics

Where is the nucleon spin?

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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Figure 1: A new measurement of the gluon spin contribution to the total spin of a nucleon has been made by the COMPASS collaboration, from the scattering of muons from protons.

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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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