SIMPLE CLASSIFICATION OF FINAL-STATE INTERACTION EFFECTS IN HE-4(E,E'P) SCATTERING

The radius of interaction between the struck proton and spectator nucleons is close to the radius of short-distance two-nucleon correlations in nuclear matter, which makes final state interaction (FSI) an important background to production of protons with large missing momentum. We present a simple classification of the dominant FSI effects in inclusive He-4(e, e'p) scattering and identify parts of the phase space dominated by FSI. At large missing momentum, final state interaction leads to a striking angular anisotropy of the missing momentum distribution, which has a prominent peak in transverse kinematics and smaller, forward-backward asymmetric, peaks in parallel kinematics.