Summary
A discrepancy is apparent between the higher-order QED calculations and a recent experiment on the decay rate of the orthopositronium. It is conjectured here that this can be due to a possible pseudoscalar interaction of the electron-positron field.
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Cleymans, J., Ray, P.S. An exotic decay of orthopositronium?. Lett. Nuovo Cimento 37, 569–572 (1983). https://doi.org/10.1007/BF02751867
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DOI: https://doi.org/10.1007/BF02751867