MadGraph5_aMC@NLO

madweight transfer function

Asked by Lucia Perrini

Hi,
I am using madweight to generate the process zz -> 4leptons. I would use, for the beginning, the all_delta trasfer function.
However, when I type ./bin/madweight.py
I see the output

./Source/MadWeight/Python/create_run.py:4: DeprecationWarning: The popen2 module is deprecated. Use the subprocess module.
  import string,os,sys,re,popen2,time,stat,filecmp
starting the creation of the param_card
define new mapping file
define new mapping file
we have created 2 param_card's
create file ./Source/madweight_card.inc
create file ./Source/MadWeight/transfer_function/transfer_card.inc
treating P0_qq_llll directory
[5, 6, 4, 3]
too tiny transfer function on all particle

the same message I got using the TF dbl_gauss_pt_jet. So maybe is not really a TF problem, but I would know where I have to look for solving the problem.

Thanks.
Cheers,
Lucia

Question information

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MadGraph5_aMC@NLO Edit question
Assignee:
Pierre Artoisenet Edit question
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Lucia,

First, let the dbl_gauss_pt_jet transfer function is a non delta transfer function only for the jet.
Since you have four leptons in the final state, this transfer function is in fact equivalent to all_delta.

The problem is that MW is foreseen to make an integration but in this case they are simply no integration at all.
Since the dimension of the Phase-Space is -2
(2 for the pdf, 4*3 for the final states particles, -4*3 constraint due to the delta function, -4 due to Energy-momentum conservation)

So in principle, you can simply use MG standalone for such scenario.
In fact I would like to allow this support in MW in the future. Maybe for the beginning of December.
(Except if Pierre has time before for this)

Cheers,

Olivier

Revision history for this message
Lucia Perrini (lucia-perrini) said : 		#2

Hi Olivier,
sorry for the late reply.
I try to explain much better which is my goal.

Basically me and Pavel (in cc) have to learn how MadWeight works, since we
want to introduce this in the Z(ee/mm)H(tautau) analysis as a parallel
study to the usual cut&count.
As first step we want to make a comparison between the signal (ZH) and
background hypothesis (ZZ) on a signal sample produced with MadGraph. Since
the input of MadWeight is an LHCO file, what we should do is:

 - generate Z(ee/mm)H(tautau) with MadGraph --> this will produce an LHE
file
 - use a script to convert LHE file to LHCO file
 - start to use MadWeight to estimate weights for the 2 different
hypothesis.

Are all these steps correct?
And then, since we have just started to go through this stuff, we would use
a delta transfer function. Given these (few) details of our work project,
do you think is this delta function usable for our first tests?

Thanks.

Cheers,
Lucia

On 16 November 2012 17:06, Olivier Mattelaer <
<email address hidden>> wrote:

> pdf

--
Lucia Perrini

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#3

Hi Lucia,

Yes it makes sense, but MW cannot deal (for the moment at least) with process without any integration.
For this case what you can do, is to use MG standalone or wait a couple of weeks, we might support such type of process very soon.

Cheers,

Olivier

Revision history for this message
Lucia Perrini (lucia-perrini) said : 		#4

Thank you very much Olivier.

Cheers,
Lucia

On 23 November 2012 21:15, Olivier Mattelaer <
<email address hidden>> wrote:

> Your question #214363 on MadGraph5 changed:
> https://answers.launchpad.net/madgraph5/+question/214363
>
> Status: Open => Answered
>
> Olivier Mattelaer proposed the following answer:
> Hi Lucia,
>
> Yes it makes sense, but MW cannot deal (for the moment at least) with
> process without any integration.
> For this case what you can do, is to use MG standalone or wait a couple of
> weeks, we might support such type of process very soon.
>
> Cheers,
>
> Olivier
>
> --
> If this answers your question, please go to the following page to let us
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>
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>
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>
> You received this question notification because you asked the question.
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Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#5

Can you help with this problem?

Provide an answer of your own, or ask Lucia Perrini for more information if necessary.

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