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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