Summary
The baryon-number-violating proton decay, p → γ+e+, is calculated by considering the sum of two Feynman diagrams. One transition factor in each diagram consists of a direct pe+ coupling, the strength of which we estimate to beg pe+∼10-30.
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Buchl, R.A., Nigam, B.P. Approximate strength of a direct proton-positron coupling. Lett. Nuovo Cimento 35, 320–322 (1982). https://doi.org/10.1007/BF02754697
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DOI: https://doi.org/10.1007/BF02754697