Name: Vladyslav Shtabovenko (email_not_shown)
Date: 07/02/16-12:55:07 PM Z


Could it be that you are using Mathematica 10.1? That very version
had a weird bug with FeynArts+FeynCalc almost always knocking out the
kernel for unknown reason, see my comment here:

<https://mathematica.stackexchange.com/questions/115660/quits-kernel-during-evaluation-of-createtopologies>

All the previous and posteriors versions are unaffected, so at the end
I didn't bother to find out the reason.

On Mathematica 10.3, 9 and even 8 your model works perfectly fine (see
attachments)

Cheers,
Vladyslav

Am 02.07.2016 um 11:03 schrieb Francesco:
> Ok, I installed the new version. Thank you very much!
>
> Anyway, I think it should be easier splitting the vertices using a heavy vector.
>
> So I followed your suggestion and I created a model in FeynRules with a auxiliary particles
> V[5] == {
> ClassName -> AUX,
> SelfConjugate -> True,
> Mass -> {MAUX, Internal},
> Width -> 0,
> PropagatorLabel -> "aux",
> PropagatorType -> D,
> PropagatorArrow -> None,
> ParticleName -> "Auxiliary"
> },
>
> and the vertex
>
> Lff := Block[{mu},
> ExpandIndices[(
> QLbar.Ga[mu].QL AUX[mu]),
> FlavorExpand->{SU2W,SU2D}]/.{CKM[a_,b_] Conjugate[CKM[a_,c_]]->IndexDelta[b,c], CKM[b_,a_] Conjugate[CKM[c_,a_]]->IndexDelta[b,c]}];
>
> Here you find the FeynArts output https://www.dropbox.com/sh/hm77oyedcb3p055/AABzBlEPZvcPjAstjoclCR3ya?dl=0 (the model name is model1)
>
> When I try to create the feynman amplitude, the kernel always crashes and I don't understand why (see here https://s31.postimg.org/f8p6xy53v/Screen_Shot_2016_07_02_at_11_00_51_AM.png )
>
> what do you think? Thank you very much for your work!
>






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