MadGraph5_aMC@NLO

how to use a PDF set not yet included in LHAPDF

Asked by mattcryo

Hi everybody,
is there a way to let MG5amc@nlo use a PDF set in the right LHAPDF format but not yet included in the "official" sets?
Thank you,
Matteo

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mattcryo
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Matteo,

I would ask this question to LHAPDF. I guess that they should have a way for that.

Cheers,

Olivier

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mattcryo (mattcryo) said : 		#2

Hi, I solved the problem by the following trick:

I've modified the pdfset.index file ([LHAPDF_PATH]]/share/LHAPDF) by adding a line in the format

PDFIDNUMBER PDFFULLNAME DATAVERSIONNUMBER

the first entry was chosen such a way not to be in conflict with others, the second is self-explanatory, while the third was just copied from the previous PDF set I wished to employ. Then I've just extracted the new PDFs in the same folder containig pdfset.index file and set the PDFIDNUMBER in the run card.