Nuclear Effects in the Deuteron and Constraints on the d/u Ratio

Understand

We present a detailed study of nuclear corrections in the deuteron (D) by performing an analysis of data from deep inelastic scattering off proton and D, dilepton pair production in $pp$ and pD interactions, and W^+- and Z boson production in pp and p pbar collisions.

• In particular, we discuss the determination of the off-shell function describing the modification of the parton distribution functions in bound nucleons in the context of global QCD fits.
• Our results are consistent with the ones obtained independently from the study of deep inelastic scattering data off heavy nuclei with $A\geq4$, further confirming the universality of the off-shell function.
• We also study the sensitivity to the modeling of the deuteron wave function.