Generating Amplitude for Mu to e Gamma Process with FeynArts | Tips & Tricks"

[Safinaz]

Hi all,

Does anybody 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.

 

[huangyaoshi]

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