Nucleon-Antinucleon Scattering and Vacuum Polarization

The cross section for nucleon-antinucleon scattering is calculated by using the covariant form of the two-body equation in a simple approximation. The meson Green's function used is corrected for the first order radiative effects. The resulting $S$ matrix is shown to be unitary. The cross section is nearly independent of the coupling constant. A graph is included.