MadGraph5_aMC@NLO

MG5_aMC cut specifications

Asked by Han

Hi MG5_aMC team,

I was trying to generate SM background e.g.
> generate p p > b b~ j j [QCD]
up to the order of NLO using MG5_aMC_v2.1.0. I wanted to apply pre-cuts for b that minimum transverse momentum should be larger than 30GeV. However, when I launched the process and reached to a stage to edit param, run, shower cards, I couldn't find cut specifications for what I intended to do as described above.

Recalling MG5, I remember that there was cut specifications for b quark independent of ordinary jets, and I am wondering whether the same thing goes to MG5_aMC_v2.1.0.

All The Best !

Jeong-han Kim

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Rikkert Frederix Edit question
Last query:
Last reply:
Revision history for this message
Rikkert Frederix (frederix) said : 		#1

Dear Jeong-han Kim,

As written in the run_card

#***********************************************************************
# Cuts on the jets *
# Jet clustering is performed by FastJet.
# When matching to a parton shower, these generation cuts should be *
# considerably softer than the analysis cuts. *
# (more specific cuts can be specified in SubProcesses/cuts.f) *
#***********************************************************************

you have to edit the SubProcesses/cuts.f file if you want to have cuts that cannot be specified in the run_card.dat.

Note that you have to be very careful when applying cuts at NLO. In particular, you have to make sure that all your cuts are infra-red (and collinear) safe.

Kind regards,
Rikkert

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