Two-nucleon knockout contributions to the $^{12}$C$(e,e'p)$ reaction in   the dip and {$\Delta$}(1232) regions
  The contributions from $^{12}$C$(e,e'pn)$ and $^{12}$C$(e,e'pp)$ to the semi-exclusive $^{12}$C$(e,e'p)$ cross section have been calculated in an unfactorized model for two-nucleon emission. We assume direct two-nucleon knockout after virtual photon coupling with the two-body pion-exchange currents in the target nucleus. Results are presented at several kinematical conditions in the dip and $\Delta$(1232) regions. The calculated two-nucleon knockout strength is observed to account for a large fraction of the measured $(e,e'p)$ strength above the two-nucleon emission threshold. 
J. Ryckebusch, V. Van der Sluys, M. Waroquier, L.J.H.M. Kester, W.H.A.   Hesselink, E. Jans and A. Zondervan