1) AFAIK FeynRules usually adds a gauge parameter to the propgators of
all bosonic particles. Even if it is just a scalar, it will get some
"xi" multiplying the mass. I don't see why it is a problem for you to
set it to 1?
2) Please don't use OneLoop:
https://github.com/FeynCalc/feyncalc/wiki/FAQ#oneloop
Am 28.02.19 um 15:53 schrieb john:
> The problem is there must be one gauge parameter when I have got one gauge boson but there are a couple of different parameters and OneLoop[] does not work because of them ,I suspect (as I have checked the rest of the code). For example self energy bubble of a scalar I have in my model appears like this:
> (2^(1-D) \[Pi]^(-D/2) g^2)/(q^2-ms^2 Subscript[\[Xi], S(Gen3)])
>
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