MadGraph5_aMC@NLO

Problem with Pythia in proton - photon collision

Asked by Leandro Da Rold

Dear experts of MG5

I am studying proton - photon collision going to two jets: p a > j j, with MG5_3_4_1. I get events at parton level (an lhe file), but the HEPMC file after Pythia8 is empty. No error messages are printed in the terminal screen.

Is it possible to pass events form this processes through Pythia8? What kind of configuration is required?

Many thanks,
Leandro

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

It depends of what kind of photon this is .
If the photon is related to a PDF of lhapdf, then it should not be problematic if not yes pythia might not like it.

Cheers,

Olivier

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Leandro Da Rold (elleodarold) said (last edit ): 		#2

Thanks for your answer Olivier.
The photon is originated by a lepton. As far as I know the only PDF set containing the lepton PDF is LePDF
https://github.com/DavidMarzocca/LePDF
Is it possible to use them with MG5+Pythia?

Best,
Leandro

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

Then I do not know if this is possible or not.
Certainly not possible automatically out of MG5aMC, but likely possible if you know (and I do not) how to configure pythia8 for that particular case (and /or by creating a userhook for that case)

Cheers,

Olivier

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