MadGraph5_aMC@NLO

Difference between unweighted_events.lhe.gz and events.lhe.gz

Asked by Ramkrishna

Hello,

When we run the madgraph package then in the Event directory two lhe files formed named events.lhe.gz and unweighted_events.lhe.gz.

So, Please let me know, the difference between the two and which one we should use or prefer in which cases?

with regards,
Ram

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi ram,

events.lhe.gz has weighted events (actually we already apply some pre-unweighting)
and unweighted_events.lhe.gz contains unweighted events. This file is generated from the previous input.

You can use both files in a fully equivalent way (as you long as you keep track of the weight of each events).
Most of the people prefer to use the unweighted_events.lhe.gz
since it has less events for the same statistical uncertainty.

Cheers,

Olivier

On 19 Jun 2015, at 12:51, Ramkrishna <email address hidden> wrote:

> New question #268332 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/268332
>
> Hello,
>
> When we run the madgraph package then in the Event directory two lhe files formed named events.lhe.gz and unweighted_events.lhe.gz.
>
> So, Please let me know, the difference between the two and which one we should use or prefer in which cases?
>
> with regards,
> Ram
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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