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

The radius of interaction between the struck proton and spectator nucl eons is close to the radius of short-distance two-nucleon correlations in nuclear matter, which makes final state interaction (FSI) an impor tant background to production of protons with large missing momentum. We present a simple classification of the dominant FSI effects in incl usive He-4(e, e'p) scattering and identify parts of the phase space do minated by FSI. At large missing momentum, final state interaction lea ds to a striking angular anisotropy of the missing momentum distributi on, which has a prominent peak in transverse kinematics and smaller, f orward-backward asymmetric, peaks in parallel kinematics.