MadGraph5_aMC@NLO

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

Asked by matteo maltoni

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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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Can you provide the model/restriction?

Cheers,

Olivier

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matteo maltoni (matteo-maltoni) said : 		#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