NP number selection and Incompatibility of "Model HEL_UFO" with "Model SM" in terms of Feynman Diagrams
Dear Olivier Mattelaer,
Dear Valentin Hirschi,
My questions are below:
1- I use the Model HEL_UFO in my accounts. For example, when I select HEL_UFO as an import model for "e- e+ > h z" process, I obtain 6 Feynman diagrams (this also means NP = 0, because it gives the same result when I write "e- e+ > h z NP=0"). 3 of these 6 diagrams are fundamentally different from each other, but why are 1 to 2, 3 to 4 and 5 to 6 are exactly the same? When I select sm as the import model (or when I choose nothing) for same process, I get a single diagram that is the same as the first of the six diagrams above. Is there any discrepancy between model sm and model HEL_UFO in this case?
2- I want to take into account only the NP = 1 (only signal) for both "e- e+ > h z" process and decay of h and z. The process I wrote for this and the error I get is as follows:
MG5_aMC>generate e- e+ > h z WEIGHTED==5
INFO: Trying process: e- e+ > h z NP<=1 WEIGHTED==5 @1
INFO: Process has 16 diagrams
1 processes with 16 diagrams generated in 0.030 s
Total: 1 processes with 16 diagrams
...it is ok. But below:
MG5_aMC>generate e- e+ > h z WEIGHTED==5, h > j j, z > mu- mu+
Error detected in "generate e- e+ > h z WEIGHTED==5, h > j j, z > mu- mu+"
write debug file MG5_debug
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MadGraph5Error : Decay processes cannot specify squared orders constraints.
(At the same time, "new physics vertice" must come in the decays of h and z).
I will be glad if you answer.
Best regards,
Volkan Çetinkaya.
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