Query about reproducing MG5 simulations from a paper

Asked by Prasham Jain on 2020-05-10

Hello,

I am having some trouble reproducing the MG5 simulations done in a CMS paper.
Could you kindly help me with the required steps/syntax to do the following (taken from the CMS 1803.08856 paper section 2):

"In addition, MADGRAPH5 aMC@NLO [29] (v2.2.2) (MG5 aMC@NLO) is used to produce a simulation of tt events with additional partons. All processes with up to two additional partons are calculated at NLO and combined with the PYTHIA8 PS simulation using the FxFx [30] algorithm."

In particular, I want to reproduce Fig. 15 of 1803.08856.

Thank you in advance,
Prasham

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:
2020-05-10
Last reply:
2020-05-10

Hi,

This is not enough information in order to reproduce that curve.

But with that information you need to do something like this
generate p p > t t~ [QCD]
add process p p > t t~ j [QCD]
add process p p > t t~ j j [QCD]
output
launch
shower=PY8 #this syntax might not be supported in 2.2.2
set ickkw 3

What is missing is the setup of the matching scale:
you will get more information here:
See http://amcatnlo.cern.ch/FxFx_merging.htm

Cheers,

Olivier

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