Summary
Discussed is what is known in a model-independent way about the Mγγ vertex through the processes ll → Mγ and ll → llM. Theexact QED calculation for the cross-section is then done and the lepton-pair distribution is presented in the perpendicular plane.
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Miyazaki, T., Kuniyoshi, K. Role of the production of a pseudoscalar meson with an e+e-pair in e+e- collisions. Lett. Nuovo Cimento 37, 577–582 (1983). https://doi.org/10.1007/BF02818120
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DOI: https://doi.org/10.1007/BF02818120