Quantum Monte Carlo calculations of electron scattering from A=3 and 4 nuclei

In this talk, I will present ab initio Quantum Monte Carlo calculations for the scattering of electrons off $A=3,4$ nuclei, in the quasielastic regime. Adopting the Argonne $v_{18}$ realistic two-nucleon interaction, we use a propagation in imaginary-time to evaluate the short-time response of nuclei. This approach consistently accounts for two-body physics, both in the nucleon-nucleon interaction and the electromagnetic currents. It is also used to study scattering channels involving nucleons in back-to-back kinematics, for nn, pp and np pairs, currently tested at, e.g., JLab. I will present results for both longitudinal and transverse response functions as well as response densities.