MadGraph5_aMC@NLO

Starting up with madweight

Asked by Kirtimaan

Dear All,
I was trying to run the example that has been described on the madweight wiki.
What I did was to :
1. ./bin/mg5 : generate p p > W- , W-> e- vl~
2. output madweight MY_DIR
3. exit mg5 : cd MY_DIR
4. used the lhco file available on the wiki and put it in the Events folder
5. changed Cards/Madweight_card.dat to match the madweight card in the wiki
5. Changed the run name in the run_card to 'fermi'
6. ./bin/madweight.py
7. choose 'gauss_on_lepton'

Everything seems to run. However
1. The weights that are calculated look very different
2. The likelihood is flat

I am probably doing something wrong.

Please advise

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

1) With MW4, the weight were automatically normalized by the cross-section, this is not the case anymore with MW5.
2) the transfer function for the wiki example is done with all_delta transfer function.

Cheers,

Olivier

PS: Note that Pierre and I will both be in holiday next week (in my case from tomorrow up to the 18). So we will not be able to help you more on this before that date.

On Jul 4, 2013, at 8:41 AM, Kirtimaan <email address hidden> wrote:

> New question #231879 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/231879
>
> Dear All,
> I was trying to run the example that has been described on the madweight wiki.
> What I did was to :
> 1. ./bin/mg5 : generate p p > W- , W-> e- vl~
> 2. output madweight MY_DIR
> 3. exit mg5 : cd MY_DIR
> 4. used the lhco file available on the wiki and put it in the Events folder
> 5. changed Cards/Madweight_card.dat to match the madweight card in the wiki
> 5. Changed the run name in the run_card to 'fermi'
> 6. ./bin/madweight.py
> 7. choose 'gauss_on_lepton'
>
> Everything seems to run. However
> 1. The weights that are calculated look very different
> 2. The likelihood is flat
>
> I am probably doing something wrong.
>
> Please advise
>
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

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