Nucleon correlations and higher twist effects in nuclear structure functions

The overlap of the nucleons in nuclei plays an important role in understanding the nuclear dependence of deep inelastic scattering data. It is shown that the nuclear modification of the higher twist scale can be essentially determined by the overlapping volume per nucleon and this effect gives a large contribution to nuclear shadowing for small x and low Q2. In this kinematical region there is also a moderate enhancement of the longitudinal structure function in nuclei.