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This also follows from the fact that 6 is proportional to the imaginary part of the matrix element. Thus, since the first order Born approximation matrix element is real, only higher order Born approximations contribute tob. For a more detailed discussion seeH. Kolbenstvedt andHaakon Olsen:Nuovo Cimento,22, 610 (1961); note Sect.2 and Appendix A.
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Work partially supported by the Office of Naval Research.
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Olsen, H., Maximon, L.C. Pair production as an analyser of circular polarization of υ rays from neutral particle decays. Nuovo Cim 24, 186–189 (1962). https://doi.org/10.1007/BF02785772
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DOI: https://doi.org/10.1007/BF02785772