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A Weizs\"acker-Williams method is derived which handles the elastic and inelastic target from factors properly. The method is applied to calculate energy-angle distributions of photoproduced lepton pairs: electrons, muons, and heavy leptons, using target form factors appropriate to each case. The agreement with the exact result is found to be excellent. Simple formulas for pair production of spin-0 and spin-1 particles are also given.
Kim et al. (1973) studied this question.
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