  Using realistic nuclear many-body wave functions in the collinear
factorization framework, we evaluate nuclear Deep Inelastic Scattering at large
Bjorken xB, where correlations are needed to exceed the kinematic limits of a
single free nucleon. We find that recent experimental data on cross-section
ratios from the CLAS collaboration exhibit features that are not reproduced by
modern 2- and 3-nucleon correlations in the nuclear wave function. New physical
mechanisms are needed to explain data in the 2<xB<3 range.
