The extracted F2^n/F2^p ratio saturates at 0.47 ± 0.04 as x approaches 1, supporting perturbative QCD and Dyson-Schwinger predictions over scalar diquark models.
Nucleon spin structure at very high-x
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abstract
Dyson-Schwinger equation treatments of the strong interaction show that the presence and importance of nonpointlike diquark correlations within the nucleon are a natural consequence of dynamical chiral symmetry breaking. Using this foundation, we deduce a collection of simple formulae, expressed in terms of diquark appearance and mixing probabilities, from which one may compute ratios of longitudinal-spin-dependent u- and d-quark parton distribution functions on the domain x =1. A comparison with predictions from other approaches plus a consideration of extant and planned experiments shows that the measurement of nucleon longitudinal spin asymmetries on x =1 can add considerably to our capacity for discriminating between contemporary pictures of nucleon structure.
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Neutron valence structure from nuclear deep inelastic scattering
The extracted F2^n/F2^p ratio saturates at 0.47 ± 0.04 as x approaches 1, supporting perturbative QCD and Dyson-Schwinger predictions over scalar diquark models.