Measurements of a transversely polarized target were used to probe the spin structure of the proton in the low-energy region where the interactions between the quarks cannot be ignored. These results provide a benchmark for testing our understanding of the strong force.
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References
Alarcon, J. M., Hagelstein, F., Lensky, V. & Pascalutsa, V. Forward doubly-virtual compton scattering off the nucleon in chiral perturbation theory. II. Spin polarizabilities and moments of polarized structure functions. Phys. Rev. D 102, 114026 (2020). A theoretical calculation of the strong force, which reports structure function moments that are in good agreement with our data.
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Sulkosky, V. et al. Measurement of the generalized spin polarizabilities of the neutron in the low-Q2 region. Nat. Phys. 17, 687–692 (2021). This article presents calculations of spin structure function moments for the neutron that are in tension with the theoretical calculations at low momentum transfer.
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This is a summary of: Ruth, D. et al. Proton spin structure and generalized polarizabilities in the strong quantum chromodynamics regime. Nat. Phys. https://doi.org/10.1038/s41567-022-01781-y (2022).
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Testing the theory of the strong force by measuring proton spin polarizabilities. Nat. Phys. 18, 1406–1407 (2022). https://doi.org/10.1038/s41567-022-01783-w
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DOI: https://doi.org/10.1038/s41567-022-01783-w
