problem with feynarts/formcalc interface

[ahmadhep]

Hello,
I am doing 1-loop calculations,I have written a model and loaded it in FeynArts and painted the amplitudes and constructed feynarts amplitude with no problem but when I use FormCalc's command CalcFeynAmp[...........,PaVeReduce->True] it does not do it's job and merely prints sum of integrals over propagators.something like this:(I have included a part of it as it is too big)

Amp[{{S[1], k[1], ms, {X}}} -> {{S[1], k[2], ms, {X}}}][-1/(
16 \[Pi]^4)
I (g^2 ("g"[Lor1, Lor2]^2 FAPropagatorDenominator[q1, 0] +
q1[Lor2] ((-q1)[Lor1] + q1[Lor1] (
SequenceForm["xi",
Subscript[
FeynArts`V[Gen3]]])) "g"[Lor1, Lor2] FAPropagatorDenominator[q1,
0]^2 + FAPropagatorDenominator[q1, ms Sqrt[SequenceForm["xi",
Subscript[
FeynArts`S[Gen3]]]]]))]

but when I use for example SM model which is built in to FeynArts everything is fine and I get a fine output like this:(again a part of it as it is big)

-(1/(MW2 \[Pi] SW2))
Alfa (1/4 (A0[Mf2[2, Gen3]] +
ms^2 B0i[bb1, ms^2, Mf2[2, Gen3], Mf2[2, Gen3]]) Mf2[2,
Gen3] + 1/
2 B0i[bb0, ms^2, Mf2[2, Gen3], Mf2[2, Gen3]] Mf2[2, Gen3]^2 +
3/4 ((A0[Mf2[3, Gen3]] +
ms^2 B0i[bb1, ms^2, Mf2[3, Gen3], Mf2[3, Gen3]]) Mf2[3,
Gen3] + (A0[Mf2[4, Gen3]] +
ms^2 B0i[bb1, ms^2, Mf2[4, Gen3], Mf2[4, Gen3]]) Mf2[4,
Gen3]) +
3/2 (B0i[bb0, ms^2, Mf2[3, Gen3], Mf2[3, Gen3]] Mf2[3, Gen3]^2 +
B0i[bb0, ms^2, Mf2[4, Gen3], Mf2[4, Gen3]] Mf2[4,
Gen3]^2)) SumOver[Gen3, 3]

I will be thankful if you help me with what might have gone wrong.Thank you in advance.

Regards.

[FStaub]

Hi,

that looks strange. If other SARAH generated models work with your setup of FeynArts/FormCalc, I would guess that this is a naming conflict: names of fields or parameters used in your model are identical to variables in FA or FC.

Cheers,
Florian