MadGraph5_aMC@NLO

Generating multiple events from the same txt file

Asked by HB

Hello,

I am pretty new to mad graph and thanks for the great tool.

I want to be able to generate various events from the same .txt file and then save the info from each run.

The script that I have so far is this:

generate p p > t t~ j
    output MYDIRECTORY
    launch MYDIRECTORY
       set mt 170 # changing the top mass
   launch
       set mt 180 # changing the top mass

launch MYDIRECTORY -i
   print_results --path=./cross_section_top.txt --format=short

generate ta- > e- ve~ vt
 output MYDIRECTORY2
 launch

launch MYDIRECTORY2 -i
   print_results --path=./cross_section_top2.txt --format=short

But it isn't able to generate the second cross_section_top2.txt file and exits with the following error:

Command "import /Users/hengameh/Downloads/MG5_aMC_v3_5_3/tst.txt" interrupted in sub-command:
"launch MYDIRECTORY2 -i" with error:
InvalidCmd : Too many argument for survey command

Is there a way to do what I have in mind?

Best,
HB

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

a simple change to your script is the following:
generate p p > t t~ j
    output MYDIRECTORY
    launch MYDIRECTORY
       set mt 170 # changing the top mass
   launch
       set mt 180 # changing the top mass

launch MYDIRECTORY -i
   print_results --path=./cross_section_top.txt --format=short
   quit # quit interactive/advance interface mode for the MYDIRECTORY

generate ta- > e- ve~ vt
 output MYDIRECTORY2
 launch

launch MYDIRECTORY2 -i
   print_results --path=./cross_section_top2.txt --format=short

now the above command can also be simplified like this:

generate p p > t t~ j
    output MYDIRECTORY
    launch MYDIRECTORY
       set mt scan:[170,180] # changing the top mass
generate ta- > e- ve~ vt
 output MYDIRECTORY2
 launch
launch MYDIRECTORY2 -i
   print_results --path=./cross_section_top2.txt --format=short

In the first case, you are in a real scan mode, so a summary script will be created with name:
MYDIRECTORY/Events/scan_run_0[1-2].txt
with content (which is slightly more useful than the print_cross format --I guess--):
#run_name mass#6 cross
run_01 1.700000e+02 5.488480e+02
run_02 1.800000e+02 4.187730e+02

For the second process, you can also "fake" the scan mode by doing
set mt scan:[175]
but the automatic created file will then also contains the mass of the top, which does not make much sense here.

Can you help with this problem?

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