Adding in cuts

Asked by s on 2020-05-15

Hi,

I am attempting to define a few of my own cuts on the lab frame momentas (max/min). I have added them into these files:

* cuts.f - definition of the cuts physically i.e. the boost between com and lab is defined.
* cuts.inc - defined the cuts as REAL*8 and given them names "PLABmin" and "PLABmax"
* banner.py add_param's statements for the two values in "default_setup"
* run_card - manually added in the cuts and gave them values.

Is there somewhere else?

Thanks

Question information

Language:
English Edit question
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Answered
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MadGraph5_aMC@NLO Edit question
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Last query:
2020-05-15
Last reply:
2020-05-15

We advise to not use cuts.f but rather dummy_fct.f in order to define your cuts.
The reason is that dummy_fct is designed to contain functions from plugin/users and can therefore easily be passed from one version of MG5 to the next.

Finally, you need to be aware that implementing cuts can breaks the phase-space integrator. yyou
If your cut is not mild, you might need to change the phase-space integrator (in setcuts.f and in myamp.f for the easy case).
For complex case, you might need to define your own phase-space integrator strategy (see the madweight paper for an example and more explanation).

Cheers,

Olivier

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