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Hi,

sorry for the late reply. I'm not sure that I understand your question.

You can write down any standard model amplitude using the basic
FeynCalc objects like four vectors, metric tensors, propagators and
Dirac or color matrices and then evaluate it. You also can generate the
diagrams using FeynArts and then convert it to FeynCalc and evaluate
that. For the external W-boson you of course need to insert the correct
polarization sum, but it is trivial to write a replacement rule for
that. There are examples for doing these kind of things:

https://github.com/FeynCalc/feyncalc/tree/master/FeynCalc/fcexamples

Cheers,
Vladyslav

Am 31.08.2014 um 14:02 schrieb Medamin:
> Hi,
> Can FeynCalc evaluate amplitudes of weak interaction examples?
> For example the decay of W->ev (W boson to electron and netrino-electron) can we calculte the amplitude of that diagram with FeynCalc?
> thanks in advance
>

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