Contribution invited talk
Novel Features of Nuclear Parton Distributions
One of the most interesting aspects of neutrino-nucleus DIS measurements is the apparent absence of antishadowing of the nuclear parton distributions, in direct contradiction to electron-nucleus and muon-nucleus measurements. This has several implications: (1) anti-shadowing may be flavor specific. This can be tested in semi-inclusive deep inelastic lepton scattering. (2) antishadowing cannot compensate for shadowing in the momentum sum rule (3) the momentum sum rule may in fact be inapplicable for the nuclear pdf, and (4) the standard operator product analysis can fail for nuclei because of shadowing and antishadowing. I will discuss the implications of these issues for nuclear pdfs in QCD based on Glauber-Gribov theory and its important connections to leading-twist diffractive DIS.