MadGraph5_aMC@NLO

how to compile and run pythia8 by hand

Asked by yuanfang

Hi,
    I am using MadGraph V3.5.1. I want to modify part of pythia8 code and compile and so that I can use it as before, i.e type launch then madgraph will generate LHE eventns and call pythia8 for parton shower for me. But if I just type "install pythia8", then madgraph will download a new pythia8 and compile automatically ,which is not what I want.
    Is it possible to compile my modified pythia8 and compile it by hand?
    Thank you!

Best,
Yuanfang

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

Hi,

Yes you can install a version of Pythia8 on your system which is compiled by hand.
You will then need to indicate to MG5aMC where the code is by editting the file input/mg5_configuration.txt

Note that for LO run (this is not the case for NLO), we need a dedicated pythia8 main file (which implement pythia8 hook as well).
this is the package called mg5amc_py8_interface
that you can either install standalone (via install mg5amc_py8_interface) or also outside of MG5 and then specify his path within the same file.

Cheers,

Olivier

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yuanfang (yuanfang405) said : 		#2

Hi Olivier,
     Thank you very much. That solved my problem.

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yuanfang (yuanfang405) said : 		#3

Thanks Olivier Mattelaer, that solved my question.