Using Externally installed libraries (Pythia+Vincia+Dire)

Asked by Vince on 2019-09-06

HI All, I've been building up an analysis chain using Pythia8 with some additional plugins going through Delphes.

I'm familiar with using MG5 to install pythia8 and Delphes internally however eventually I'd need to compile Pythia with non-standard libraries (Vincia and Dire for PS and Hadronisation studies) and hoped that I could simply add MG5_aMC@NLO to the analysis chain and just point it at my custom Pythia8 installation.

However I run into issues with mg5amc_py8_interface_path not set.

Is there a way to link MG5 against an external version of Pythia8 or would I have to install it internally and try to make my modifications insitu?

Question information

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MadGraph5_aMC@NLO Edit question
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Last query:
2019-09-06
Last reply:
2019-09-06

Hi,

It is possible.
You have to edit the file input/mg5_configuration.txt to specify the path to PY8.
and then you can type within MG5aMC the following lines:
install mg5amc_py8_interface

Cheers,

Olivier

> On 6 Sep 2019, at 12:33, Vince <email address hidden> wrote:
>
> New question #683694 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/683694
>
> HI All, I've been building up an analysis chain using Pythia8 with some additional plugins going through Delphes.
>
> I'm familiar with using MG5 to install pythia8 and Delphes internally however eventually I'd need to compile Pythia with non-standard libraries (Vincia and Dire for PS and Hadronisation studies) and hoped that I could simply add MG5_aMC@NLO to the analysis chain and just point it at my custom Pythia8 installation.
>
> However I run into issues with mg5amc_py8_interface_path not set.
>
> Is there a way to link MG5 against an external version of Pythia8 or would I have to install it internally and try to make my modifications insitu?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Vince (vincecr0ft) said : #2

Hi yes, tried this install mg5amc_py8_interface didn't work with an external pythia8 build unless HEPMC2 was installed and linked (with libraries) against the Pythia installation. It seems to be running now.

Can you help with this problem?

Provide an answer of your own, or ask Vince for more information if necessary.

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