MadGraph5_aMC@NLO

I have two LHE files, which one to choose ?

Asked by Abdellah Tnourji

Dear expert,

I have a very naive question:

1. When I run MadGraph@NLO, After showering my process (at NLO) I have two .lhe files both called events.lhe :

           1. First at : run_01/events.lhe.gz (size: 65M)
           2. Second at : run_01_decayed_1/events.lhe.gz (size : 250M)

First, In my analysis, I am interested in parton-level events and I have doubts about which LHE file to chose?

Second, I don't know how to use HEPMC file, is there a way to transform it into a root file?

Thanks, lots for your help.

A.Tnourji.

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

Hi,

It seeems that you ask madgraph to run MadSpin to add the decay of some of your final state.
1. First at : run_01/events.lhe.gz (size: 65M)
This is the output of the NLO computation and the input for MadSpin (so no decay in this file)
2. Second at : run_01_decayed_1/events.lhe.gz (size : 250M)
This is the output of MadSpin (so you have the decay that you request in this file).

> Second, I don't know how to use HEPMC file, is there a way to transform it into a root file?

I'm a theorist so I do not use root very often but if you search online, you should be able to find such converter.
(now you have a C++ module to read HEPMC file directly in C++ so you do not really need a converter to another format in principle)

Revision history for this message
Abdellah Tnourji (atnourji) said : 		#2

Thanks Olivier Mattelaer, that solved my question.