MadGraph5_aMC@NLO

maximum invariant mass cut for heavy particle

Asked by Chang Jung

Dear Sir,

I noticed there are mxx_min_pdg in run card to cut on heavy state invariant mass minimum.
I wish to put the invariant mass maximum cuts.

I found there are two file common_run_interface.py and banner.py contained the "mxx_min_pdg".
But I did not found where the cut defined.

May I ask how to add maximum cuts like mxx_max_pdg?

Thanks!

Best,
Justine

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Launchpad Janitor (janitor) said : 		#1

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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Olivier Mattelaer (olivier-mattelaer) said : 		#2

This is a much too advanced topics.

Those cuts are indeed defined in a very complex way due to the possibility of the unknown pdg code.
In top of that, the implementation of those cuts where deeply connected to optimization of the phase-space generator.
Such optimization does not work the same way for min and for max operator. So those are not simple copy-paste (but rather re-think the full phase-space generator.

So I would advise, to implement your cuts in dummy_functions.f
without all the complication that are defined above.
As usual, adding cuts will decrease the efficiency of the phase-space generator (if your cut are strong this can be even worse obviously)

Cheers,

Olivier

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Chang Jung (lovejesus99wwjd) said : 		#3

Dear Olivier,

Thanks a lot for the reply! I got it.

Best,
Justine