MadGraph5_aMC@NLO

Query about reproducing MG5 simulations from a paper

Asked by Prasham Jain

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
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:
Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#1

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

Can you help with this problem?

Provide an answer of your own, or ask Prasham Jain for more information if necessary.

To post a message you must log in.