# Mu to e gamma by FeynArts

Hi all,

Does any body work with FeynArts? I try to generate the amplitude of ## \mu \to e \gamma ## process by :

tops = CreateTopologies[1, 1 -> 2]
ins = InsertFields[tops, F[2, {2}] -> {F[2, {1}], V[1]}]

But when I type:
Paint[ins]

it returns

out[] FeynArtsGraphics[{"\\mu"} -> {"e", "\\gamma"}][]

and doesn't generate the amplitude .. what should I add ?

Regards,
S.

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

what model did you use? SM? in the SM, there is no this kind of vertex because of lepton flavor conservation.
If you want to generate it, at first, u should modify the model file in FeynArts