Constraints on the large-x d/u ratio from electron-nucleus scattering at x>1

Abstract

Recently the ratio of neutron to proton structure functions F_2n/F_2p was extracted from a phenomenological correlation between the strength of the nuclear EMC effect and inclusive electron-nucleus cross section ratios at x>1. Within conventional models of nuclear smearing, this "in-medium correction" (IMC) extraction constrains the size of nuclear effects in the deuteron structure functions, from which the neutron structure function F_2n is usually extracted. The IMC data determine the resulting proton d/u quark distribution ratio, extrapolated to x=1, to be 0.23 +- 0.09 with a 90% confidence level. This is well below the SU(6) symmetry limit of 1/2 and significantly above the scalar diquark dominance limit of 0.

4 pages, 3 figures

References in corpus (4)

• Short Range Correlations and the EMC Effect
• Distribution Functions of the Nucleon and Pion in the Valence Region
• Covariant spectator theory of np scattering: Phase shifts obtained from precision fits to data below 350 MeV
• Neutron Structure Functions

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• The center of mass motion of short-range correlated nucleon pairs studied via the A(e,e'pp) reaction
• Neutron valence structure from nuclear deep inelastic scattering
• Extracing the number of short-range corerlated nucleon pairs from inclusive electron scattering data
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• Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q^2
• Direct observation of quark-hadron duality in the free neutron F_2 structure function
• Quasielastic electron-deuteron scattering in the weak binding approximation
• Hadron physics and dynamical chiral symmetry breaking