MadGraph5_aMC@NLO

Impose cut on invariant mass of two different particles

Asked by Michele Tarquini

Hi,
I would like to impose a cut on the invariant mass of two particles with different pdg codes. Is there a way to do it?

It seems that the only options on the run card are to impose a cut on mjj or on the invariant mass of two particles with the same pdg code (up to a sign).

Thank you,
Michele

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Yes indeed this is not possible via the run_card.dat.

One way is to create such cut via the dedicated method (needs to know Fortran) but this would typically work only for "soft" cut.
For invariant mass cut, it might be better to hack directly the setcuts.f file, to add it to the list of invariant mass between two particles directly (which is likely more efficient and simpler than coding your own function -- but you still need to know fortran--).

Cheers,

Olivier
FAQ #3323: “How to implement new cuts”.

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