General formulae for f1 --> f2 gamma

Details General formulae for f1 --> f2 gamma General formulae for f1 --> f2 gamma

2003-02-25

arxiv.org/abs/hep-ph/0302221v1

Eur.Phys.J.C29:191-195,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages LATEX

Scientific paper

10.1140/epjc/s2003-01212-7

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

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