Comparison of the Electromagnetic Response Functions RL and RT for C-12, Ca-40 and Fe-56 to Nuclear Theory and Neutrino MC Generators

We report on global extractions of the C-12, Ca-40 and Fe-56 longitudinal RL and transverse RT nuclear electromagnetic response functions from an analysis of all available electron scattering and photoprodution data on these nuclei. The response functions are extracted for energy transfer ν spanning the nuclear excitation, quasielastic (QE) scattering with one nucleon (1p1h) and two nucleon (2p2h) final states, and the resonance and inelastic continuum. We extract RL and RT as functions of ν for both fixed values of the square of the four-momentum transfer Q² and also for fixed values of 3-momentum transfer q. Given the nuclear physics common to both electron and neutrino scattering from nuclei, extracted response functions from electron scattering spanning a large range of Q² and ν also provide a powerful tool for validation and tuning of neutrino Monte Carlo (MC) generators. In this paper we present comparisons of these new extractions to nuclear response functions to the predictions of nuclear theories and electron/neutrino MC generators.