MadGraph5_aMC@NLO

Pythia no longer outputting LHE file?

Asked by TMartin

So I have the latest MG5_aMC@NLO installed and working. Except that I noticed that my tag_pythia_events.lhe.gz files are mostly empty. The .hep files are ~800 MB, as they should be (50k events), and all other files seem to have the right events in them. But the LHE file only has 20 events in it, and I get a message in the madevent interface saying:

Info: Creating Pythia LHE ROOT File
** Calculating number of events to process. Please wait...
** Input file contains 0 events
** Exiting...

Thanks for any insight you can provide. These .lhe files may be important for a future part of my study.

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Not sure about this...

Could you run the following:
cp Events/run_01/tag1_pythia_beforeveto.tree.gz Events/beforeveto.tree.gz
gunzip Events/beforeveto.tree.gz
cd Events
../bin/internal/run_hep2lhe ../../pythia-pgs

and see what the log returns.

Cheers,

Olivier

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TMartin (tmartin-4) said : 		#2

I get this in the log file:

../bin/internal/run_hep2lhe: line 23: ../../pythia-pgs/hep2lhe: No such file or directory

Which is correct. There is no hep2lhe in the pythia-pgs folder. There is a hep2lhe in the src directory within pythia-pgs, though.

Does that help?

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

Yes it does.

The fix will be part of the next release.

Cheers,

Olivier

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