One-loop flavor changing electromagnetic transitions

Details One-loop flavor changing electromagnetic transitions One-loop flavor changing electromagnetic transitions

1999-06-03

arxiv.org/abs/hep-ph/9906235v2

Phys.Rev. D61 (2000) 013008

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX 16 pages + 4 postscript figures. Misprints corrected, some Comments added

Scientific paper

10.1103/PhysRevD.61.013008

We discuss the effect of the external fermion masses in the flavor-changing radiative transitions of a heavy fermion (quark or lepton) to a lighter fermion at the one-loop level, and point out an often overlooked crucial difference in the sign of a charge factor between transitions of the down type $s\to d\gamma$ and the up type $c\to u\gamma$. We give formulas for the $F\to f\gamma$ effective vertex in various approximations and the exact formula for $t\to c\gamma$ and $\tau \to \mu \gamma$.

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