MadGraph5_aMC@NLO

not storing events

Asked by John Doe

Hi all, how do I prevent MG5 from storing parton level events? I often am interested only in the cross section, so there's no need to generate and store bulky lhe.gz files.

(I suspect this a trivial FAQ, but I've not found it. If so, a pointer to the right FAQ would be all I need.)

Thanks a lot.

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

The computation of the cross-section and the generation of the events are done in the same time.
So in any case you will create events and therefore you will need to run the clean script.

So the easiest way is to do:
./bin/madevent
then enter the command:
generate_events new_run
remove new_run

if you want to speed up a bit you can enter more precise command
./bin/madevent

survey new_run
refine 10000
refine 10000
remove new_run

(and you can play with the options of survey/refine. [type help survey or help refine for having the list of those options])

Cheers,

Olivier

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John Doe (kwcpsn) said : 		#2

Thanks Olivier!