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Neutron valence structure from nuclear deep inelastic scattering

Author(s)
Segarra, Efrain Patrick; Schmidt, Axel; Kutz, Tyler; Higinbotham, D. W.; Piasetzky, E.; Strikman, M.; Weinstein, L. B.; Hen, O.; ... Show more Show less
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Abstract
Mechanisms of spin-flavor SU(6) symmetry breaking in quantum chromodynamics (QCD) are studied via an extraction of the free neutron structure function from a global analysis of deep inelastic scattering (DIS) data on the proton and on nuclei from A=2 (deuterium) to 208 (lead). Modification of the structure function of nucleons bound in atomic nuclei (known as the EMC effect) are consistently accounted for within the framework of a universal modification of nucleons in short-range correlated (SRC) pairs. Our extracted neutron-to-proton structure function ratio F[subscript 2 under superscript n]/F[subscript 2 under superscript p] becomes constant for x[subscript B]≥0.6, equaling 0.47±0.04 as x[subscript B]→1, in agreement with theoretical predictions of perturbative QCD and the Dyson-Schwinger equation, and in disagreement with predictions of the scalar diquark dominance model. We also predict [mathematical figure; see resource], recently measured, as yet unpublished, by the MARATHON Collaboration, the nuclear correction function that is needed to extract F[subscript 2 under superscript n]/F[subscript 2 under superscript p] from [mathematical figure; see resource], and the theoretical uncertainty associated with this extraction. ©2020
Date issued
2020-03-06
URI
https://hdl.handle.net/1721.1/124844
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical review letters
Publisher
American Physical Society
Citation
Segarra, E.P., et al., "Neutron valence structure from nuclear deep inelastic scattering." Physical review letters 124 (Mar. 2020): no. 092002 doi 10.1103/PhysRevLett.124.092002 ©2020 Author(s)
Version: Final published version
ISSN
1079-7114
0031-9007

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