Name: Francsco Date: 08/19/16-02:02:40 AM Z
Hi everyone!
The model I am using is the following
.mod file http://pastebin.com/JiTtUxRV
.gen file http://pastebin.com/4zTsR70j
where there is a spin-1 and spin-2 fields which couple to d-type quark.
The theory is SU(3) flavor-invariant and I have operators with the
expression of the generators.
I tried to define them in feynrules and then export the model. Any way,
I replaced them with FASUNT and it seems to work well.
When i ask to compare the amplitude for the process dq dq -> dq dq
with
InsertFields[top, {F[4, {}], F[4, {}]} -> {F[4,
{}], F[4, {}]},
InsertionLevel -> {Classes}, Model -> “spin2”,
GenericModel -> “spin2”,
ExcludeParticles -> {S[2], V[1], V[2],
S[1], V[3], S[3]}];
I get the result without problem.
Instead, when I try to compute the amplitude for a specific generation of quarks, like d d -> d d I get the a strange result
http://pasteboard.co/aj7FW2nJZ.png
http://pasteboard.co/aj84atIQL.png
It seems that the sum over the adjoint-generation indices (the index labeling the generators) does not work… any suggestion??
Thank you,
Francesco
