Constraints on the large-x d/u ratio from electron-nucleus scattering at x>1
High Energy Physics - Phenomenology
2015-05-30 v1 High Energy Physics - Experiment
Nuclear Experiment
Nuclear Theory
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.
Keywords
Cite
@article{arxiv.1110.2419,
title = {Constraints on the large-x d/u ratio from electron-nucleus scattering at x>1},
author = {O. Hen and A. Accardi and W. Melnitchouk and E. Piasetzky},
journal= {arXiv preprint arXiv:1110.2419},
year = {2015}
}
Comments
4 pages, 3 figures