MadGraph5_aMC@NLO

missing Merging options in run_card.dat

Asked by Andre Sznajder

Hi,
I have generated a VBF Z+2J process p p > Z j j , Z > l+ l- with mg5_aMC using a docker container and the run_card.dat that was created for this process is missing the options for MLM and CKKW merging.
All I could find in the run_card.dat about it is the following comment:
# To see MLM/CKKW merging options: type "update MLM" or "update CKKW"
Is there a way to create the process with a run_card.dat already containing the options for merging ?
When I try to run "update MLM" within my container I get an isntalletion error ...
Cheers,
Andre

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

The line "update MLM" should be typed when the code is asking you to edit the cards:

Do you want to edit a card (press enter to bypass editing)?
/------------------------------------------------------------\
| 1. param : param_card.dat |
| 2. run : run_card.dat |
| 3. madanalysis5_parton : madanalysis5_parton_card.dat |
 \------------------------------------------------------------/
 you can also
   - enter the path to a valid card or banner.
   - use the 'set' command to modify a parameter directly.
     The set option works only for param_card and run_card.
     Type 'help set' for more information on this command.
   - call an external program (ASperGE/MadWidth/...).
     Type 'help' for the list of available command
 [0, done, 1, param, 2, run, 3, madanalysis5_parton, enter path][90s to answer]

Now you do not need such command per say,
you can just add the block by hand (if you know it):

 #*********************************************************************
 # Matching parameter (MLM only)
 #*********************************************************************
  0 = ickkw ! 0 no matching, 1 MLM
  1.0 = alpsfact ! scale factor for QCD emission vx
  False = chcluster ! cluster only according to channel diag
  5 = asrwgtflavor ! highest quark flavor for a_s reweight
  True = auto_ptj_mjj ! Automatic setting of ptj and mjj if xqcut >0
                                    ! (turn off for VBF and single top processes)
  0.0 = xqcut ! minimum kt jet measure between partons

Cheers,

Olivier

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Andre Sznajder (andre-sznajder) said : 		#2

Thanks Olivier Mattelaer, that solved my question.