# NP diagrams not shown when computing interference between SM and NP operator

Dear MG5 experts,

I'm generating some LO events for the interference among the SM and a dim6 operator (c_qq1) with the following syntax:

generate p p > l+ vl j j QCD=2 NP^2==1

The diagrams with NP=1 are not drawn among the SM ones, though; still the cross-section is negative, so I guess that they have been considered in the computations...

Also, if I display the diagrams for just one subprocess, like

generate p p > e+ ve u d QCD=2 NP^2==1

the NP=1 diagrams are actually drawn. I tried with a few SMEFT models, but they all behave in the same way.

Do you know if this is a bug, and if the results can be trusted?

Cheers,

Matteo

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matteo maltoni
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 Revision history for this message Olivier Mattelaer (olivier-mattelaer) said on 2023-02-01: #1

Can you provide the model/restriction?

Cheers,

Olivier

 Revision history for this message matteo maltoni (matteo-maltoni) said on 2023-02-01: #2

The html page is actually showing only the first 12 diagrams for each line in Process Information, but in the SubProcesses folder all the diagrams are there