Effective Spectral Function for Quasielastic Scattering on Nuclei

Spectral functions do not fully describe quasielastic electron and neutrino scattering from nuclei because they only model the initial state. Final state interactions distort the shape of the differential cross section at the peak and increase the cross section at the tails of the distribution. We show that the kinematic distributions predicted by the psi' super scaling formalism can be well described with a modified effective spectral function (ESF). By construction, models using ESF in combination with the transverse enhancement contribution correctly predict electron QE scattering data. Our values for the binding energy parameter Delta are smaller than (epsilon) over bar extracted within the Fermi gas model from pre 1971 data by Moniz[8], probably because these early cross sections were not corrected for coulomb effects.