4He(e,e'p)3H reaction with full final-state interactions

An ab initio calculation of the 4He(e,e'p)3H longitudinal response is presented. The full four-body final-state interaction is taken into account by using an integral transform approach with a Lorentzian kernel. The semirealistic nucleon-nucleon potential MTI-III, including the Coulomb force, is the only ingredient of the calculation. The reliability of the direct knock-out hypothesis is discussed in both parallel and nonparallel kinematics. In the former case, lower missing momenta and higher momentum transfers are found to minimize effects beyond the plane-wave impulse approximation. For nonparallel kinematics, the role of antisymmetrization and the final-state interaction become more and more important as the missing momentum increases, raising doubts about the possibility of extracting momentum distributions and spectroscopic factors. The comparison with experimental data is discussed for parallel kinematics, in which a Rosenbluth separation is possible