Pion Rescattering in Nuclei
  Nuclear corrections are presented for neutrino and electron induced reactions in a pedagogical manner. The formalism is demonstrated with numerical studies and is shown to produce substantial corrections in channels where the pions have the same charge with the exchanged current. Two comparisons with available data show consistency of the model. Further studies along these lines will improve the accuracy of the results and enhance the discovery potential of experiments. 
E.A. Paschos, I. Schienbein and J.Y. Yu