Speaker
Description
We perform a global extraction of the ${\rm ^{12}C}$, ${\rm ^{40}Ca}$ and ${\rm ^{56}Fe}$ longitudinal (${\cal R}_L$) and transverse (${\cal R}_T$) nuclear electromagnetic response functions from an analysis of all available electron scattering data on carbon. The response functions are extracted for energy transfer $\nu$, spanning the nuclear excitation, quasielastic (QE), resonance and inelastic continuum over a large range of the square of the four-momentum transfer, $Q^2.$ In addition, we perform a universal fit to all electron scattering data on these nuclear targets which also provides parmeterizations of ${\cal R}_L$ and ${\cal R}_T$ over a larger kinematic range. Given the nuclear physics common to both electron and neutrino scattering from nuclei, extracted response functions from electron scattering spanning a large range of $Q^2$ and $\nu$ also provide a powerful tool for validation and tuning of neutrino Monte Carlo (MC) generators. In particular, the predictions of the SuSAv2 formalism (which is implemented in the GENIE electron and neutrino scattering generator) are in disagreement with the electron scattering data. We extract $Q^2$ dependent correction factors to the SuSAv2-QE and SuSAv2-MEC-2p2h predictions for ${\cal R}_T$ and ${\cal R}_T$ to the theory for better agreement with electron scattering data.