  We present the reweighting of two sets of nuclear PDFs, nCTEQ15 and EPPS16,
using a selection of experimental data on heavy-flavor meson [D0, J/psi, J/psi
from B and Upsilon(1S)] production in proton-lead collisions at the LHC which
were not used in the original determination of these nuclear PDFs. The
reweighted PDFs exhibit significantly smaller uncertainties thanks to these new
heavy-flavor constraints. We present a comparison with another selection of
data from the LHC and RHIC which were not included in our reweighting
procedure. The comparison is overall very good and serves as a validation of
these reweighted nuclear PDF sets, which we dub nCTEQ15_rwHF & EPPS16_rwHF.
This indicates that the LHC and forward RHIC heavy-flavor data can be described
within the standard collinear factorization framework with the same (universal)
small-x gluon distribution. We discuss how we believe such reweighted PDFs
should be used as well as the limitations of our procedure.
