MadGraph5_aMC@NLO

Wrong event number

Asked by Li

Hi,

    Generating pp -> zzjj and ptj>400 GeV. I use multirun, and for each run 100k event.

    The problem is that the first sub run the result is 70274, the second is 628, the third is 280 event, in the parton level.

    I asked you about this problem and you said it may be the limitation of the process. But I don't understand why the second and third sub run event number is so small compare to the first sub run.

    Is there any way to avoid this problem?

Best,
Li

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

This should be related to the seed and related to the intrinsic randomness of the
code.

> Is there any way to avoid this problem?

Except using the latest version of the code where we recently improved such type of computation.
Another solution would be to hack the code to increase the maximal number of iteration for each computation.
But we do not have any clean way of doing this (I have added a note on this on my list of idea for future improvement)

Cheers,

Olivier

> On Jun 10, 2018, at 07:18, Li <email address hidden> wrote:
>
> Question #670097 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/670097
>
> Description changed to:
> Hi,
>
> Generating pp -> zzjj and ptj>400 GeV. I use multirun, and for each
> run 100k event.
>
> The problem is that the first sub run the result is 70274, the
> second is 628, the third is 280 event, in the parton level.
>
> I asked you about this problem and you said it may be the limitation
> of the process. But I don't understand why the second and third sub run
> event number is so small compare to the first sub run.
>
> Is there any way to avoid this problem?
>
> Best,
> Li
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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