Speaker
Description
After decades of study of the nucleon spin structure, the deep-valence quark (high x) region remains difficult to access experimentally. On the other hand, the deep valence quark region is is a clean testing ground of various predictions for the ratio of polarized and unpolarized structure functions, and quark polarization inside the proton. These predictions include relativistic constituent-quark model, perturbative QCD, light-cone holographic QCD, and Schwinger-Dyson equations. We report on a 12 GeV Jefferson Lab experiment (E12-06-110) that measured the virtual photon asymmetry of the neutron, A1n. The experiment used a longitudinally polarized beam of 10.4 GeV energy and a polarized 3He target in Hall C. It pushed the highest x value from x=0.61 of the 6 GeV era to x=0.75. Preliminary results and the current status of the analysis will be presented.
(the author is giving this talk on behalf of the E12-06-110 Collaboration)
– This work is supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract number DE–SC0014434.
