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Abstract
Pair production cross sections near threshold have been calculated numerically in partial waves for a screened central potential, permitting a comparison of theory with recent experiments. Exchange effects are found to remain small. The level of agreement with experiment is variable and does not suggest any systematic trends. A more approximate theory of screening, energy-shift screening theory (EST), identifying screened cross sections with Coulomb cross sections of shifted spectrum energy ${V}_{0}$, is in agreement with the full calculation if the proper choice is made for the energy shift ${V}_{0}$; however, the procedure becomes more delicate as threshold is approached. A previous attempt to apply EST to threshold experiments made an incorrect choice for ${V}_{0}$.
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