Global Extraction of the 12C Nuclear Electromagnetic Response Functions (RL and RT ) and Comparisons to Nuclear Theory and Neutrino/Electron Monte Carlo Generators.

We have performed a global extraction of the ¹²C longitudinal (R_L) and transverse (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 ν, spanning the nuclear excitation, quasielastic (QE), resonance and inelastic continuum over a large range of the square of the fourmomentum transfer, Q^2. In addition, we perform a universal fit to all ¹²C electron scattering data which also provides parmeterizations of R_L and 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 Q² and ν also provide a powerful tool for validation and tuning of neutrino Monte Carlo (MC) generators. In this paper we focus on the nuclear excitation, single nucleon (QE-1p1h) and two nucleon (2p2h) final state regions and compare the measurements to theoretical predictions including “Energy Dependent-Relativistic Mean Field” (ED-RMF), “Green’s Function Monte Carlo” (GFMC), “Short Time Approximation Quantum Monte Carlo” (STA-QMC), an improved superscaling model (SuSAv2), “Correlated Fermi Gas” (CFG), as well as the NuWro, and achilles generators.