Abstract
The rare electromagnetic decay of a neutral pseudoscalar meson into a lepton pair is calculated in a bound state quark model. For heavy mesons, the leading QCD diagram is argued to be dominant allowing higher order QCD corrections to be neglected for the branching ratio of this decay to the two-photon decay. The experimentally interesting case of pion decay is treated separately, and the rates for competing processes (weak neutral currents, axions, technicolour ...) are estimated. We conclude that existing data may well allow for such contributions.
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Bergström, L. Rare decay of a pseudoscalar meson into a lepton pair—A way to detect new interactions?. Z. Phys. C - Particles and Fields 14, 129–134 (1982). https://doi.org/10.1007/BF01495033
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DOI: https://doi.org/10.1007/BF01495033