MadGraph5_aMC@NLO

Apply cuts in run_cards

Asked by Rouzbeh

Hello All experts,

I am using MG5_aMC_v3_4_2 and trying to apply some cuts in my process:
generate p p > ~V ~V z , z > l+ l- (~V is mine vector dark matter).
For applying cuts in pt or eta can I use syntax like ptl, ptlmax, etal, etalmin or should I use pdg code for applying cuts in particles?
Another question I have two charged leptons in decaying the z boson how can I apply different pts for electron and muon? by pdg codes?

Thank you so much for your consideration.

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

> For applying cuts in pt or eta can I use syntax like ptl, ptlmax, etal, etalmin or should I use pdg code for applying cuts in particles?

At LO, you can technically use both, but for simplicity I would advise to use the non pdg version.

> Another question I have two charged leptons in decaying the z boson how can I apply different pts for electron and muon? by pdg codes?

If you want to have different cut for electron and muon, you need to deactivate some optimization related to electron/muon which are consider as identical in the code (and therefore subject to the same cut).
The best way is to have the electron mass set to zero but have non zero muon mass.

If that's problematic, then you can use the command "set group_subprocesses False" but this command deactivate a lot of other optimization as well (like the identification of the quark,...)

Cheers,

Olivier

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Rouzbeh (rouzbehi) said : 		#2

Thanks Olivier Mattelaer, that solved my question.