MadGraph5_aMC@NLO

Weights for multiple PDFs in 2.6.5

Asked by Chris Hays

Hi,

  Can you tell me how to write out weights for multiple PDFs in 2.6.5? The following worked in 2.6.3:

     lhapdf = pdlabel ! PDF set
     11000, 11100, 13100, 260000, 303400, 307000, 25100 = lhaid ! if pdlabel=lhapdf, this is the lhapdf number

Thanks
Chris

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

This is still a valid method in 2.6.5
However such syntax is only supported when you generate NLO output.
This is not valid for LO output (i.e. madevent)

In case of LO processes, you need to set the following lines:
True = use_syst
systematics = systematics_program
["--pdf=11100@0, 13100@0, 260000@0, 303400@0, 307000@0, 25100@0"] = systematics_arguments ! see: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Systematics#Systematicspythonmodule

You have the link which contains the full syntax, if you also need/want scale uncertainty, full PDF set range,...

Cheers,

Olivier

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