MadGraph5_aMC@NLO

MadGraph to generate weighted events

Asked by Keping Xie

In older version of MadGraph, it can generate weighted events. How can we get the same option in the latest version of MadGraph, without directly going to the unweighted events?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

We do not have such output anymore.
Actually in the old version of the code, the "weighted" files was not really a weighted sample but a collection of un-weighted sample. (all the events from the same channel had the same weight). So for a sample with a single channel, that file was also un-weighted.

The only option is to hack the code (should be madgraph/various/lhe_parser.py) to change the final unweighting stage in order to get the same output of the previous version of the code.

Cheers,

Olivier

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