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At one-loop level the decay f1 --> f2 gamma, where f1 and f2 are two spin-1/2particles with the same electric charge, is mediated by a boson B and aspin-1/2 fermion F. The boson B may have either spin 0 - interacting with thefermions through Dirac matrices 1 and gamma5 - or spin 1 - with V+A and V-Acouplings to the fermions. I give general formulae for the one-loop electroweakamplitude of f1 --> f2 gamma in all these cases.Comment: 11 pages LATE

General formulae for $f_1 \to f_2 \gamma$