Multiple runs with different centre of mass energies

Asked by H O Lim on 2017-02-17

Dear Madgraph team,

Hi, I am currently doing a project that requires varying the centre of mass energy of a scattering process and getting the cross section. I am just wondering is there a way to just edit the ebeam1 and ebeam2 and do multiple run on the madgraph without generating the whole process again which will result in outputting a new folder?

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Solved by:
Olivier Mattelaer
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Did you look at the following link?
you can also do the same without the first two line of the examples if that directory already exists.
(in that case you can run such script from ./bin/madevent PATH if you do not specify the directory for the first "launch" command.)

For modifying the energy beam, you can use
set ebeam1 XXX
set ebeam2 XXX
set ebeam XXX #modify both to XXX
set LHC 14. # 14 TeV LHC
set lep 200. # 200GeV lep

Olivier Mattelaer suggests this article as an answer to your question:
FAQ #2186: “How to script MG5 run?”.

H O Lim (accel6076) said : #2

Thanks Olivier Mattelaer, that solved my question.