Constraints on the largex d/u ratio from electronnucleus scattering at x>1
Abstract
Recently the ratio of neutron to proton structure functions F_{2}^{n}/F_{2}^{p} was extracted from a phenomenological correlation between the strength of the nuclear EMC effect and inclusive electronnucleus cross section ratios at x>1. Within conventional models of nuclear smearing, this “inmedium correction” (IMC) extraction constrains the size of nuclear effects in the deuteron structure functions, from which the neutron structure function F_{2}^{n} 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.
 Publication:

Physical Review D
 Pub Date:
 December 2011
 DOI:
 10.1103/PhysRevD.84.117501
 arXiv:
 arXiv:1110.2419
 Bibcode:
 2011PhRvD..84k7501H
 Keywords:

 12.38.t;
 13.60.r;
 24.85.+p;
 Quantum chromodynamics;
 Photon and chargedlepton interactions with hadrons;
 Quarks gluons and QCD in nuclei and nuclear processes;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment;
 Nuclear Experiment;
 Nuclear Theory
 EPrint:
 4 pages, 3 figures