  We explore the sensitivity of W and Z boson production in hadronic collisions
to uncertainties in parton distribution functions (PDFs) at large x arising
from uncertainties in nuclear corrections when using deuterium data in global
QCD fits. The W and Z differential cross sections show increasing influence of
nuclear corrections at high boson rapidities, particularly for the d quark,
which is diluted somewhat in the decay lepton rapidity distributions. The
effects of PDF uncertainties on heavy W' and Z' bosons beyond the Standard
Model become progressively more important for larger boson masses or
rapidities, both in p-p collisions at the LHC and in p-pbar scattering at the
Tevatron.
