Comparison of Electron and Positron results for scattering from hydrogen

The elementary first order Born approximation predicts that the cross sections for electrons and positrons should be the same. Any improved theory, however, predicts that these cross sections should be different. Consequently, it is of interest to compare electron and positron results to determine both the extent of the breakdown of the Born approximation and the effects of identical particles. Electron and positron results calculated in the first and second order distorted wave approximation will be presented, discussed, and compared with previous calculations