Neutron Structure at Large X
An impressive amount of high quality nucleon structure function data exists from hydrogen, deuterium, and heavier targets. However, the lack of a neutron target has made direct comparisons between the proton and neutron structure nearly impossible at large x, where nuclear effects become large. The behavior of the d quark as x approaches 1 is particularly sensitive to deuterium nuclear corrections.
The impact on the parton distribution functions (PDFs) from these effects have been evaluated within a global PDF analysis. The results will be discussed, as well as compared to results from the Barely Off-Shell Nucleon Structure (BONUS) Experiment. The BONUS experiment employed a radial time projection chamber in the CEBAF Large Acceptance Spectrometer in Hall B at Jefferson Lab. The novel detector observes spectator protons resulting from electron-deuteron interactions in coincidence with electrons.