MadGraph5_aMC@NLO

pp > Z l+ l- +0-3jets LO generation

Asked by Andre Sznajder

We are trying to generate the process bellow:

generate p p > z l+ l- @1
add process p p > z l+ l- j @2
add process p p > z l+ l- j j @3
add process p p > z l+ l- j j j @4

and then decay the Z using Madspin to keep spin correlations.
The process keeps crashing during Madspin decay , probably due to the large multiplicity in the final state.
Is it possible and would it help to split the generation of the 3jet multiplicity from the lower multiplicities ?
If yes, what would be the generation run_card options in order to be able to merge the samples afterwards ?

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Andre Sznajder
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

I do not have that much information here.

> The process keeps crashing during Madspin decay , probably due to the large multiplicity in the final state.
> Is it possible and would it help to split the generation of the 3jet multiplicity from the lower multiplicities ?

I do not see how this could help (but I do not have any clue why it would crash so...)

Cheers,

Olivier

> On 5 Apr 2021, at 10:20, Andre Sznajder <email address hidden> wrote:
>
> New question #696393 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/696393
>
> We are trying to generate the process bellow:
>
> generate p p > z l+ l- @1
> add process p p > z l+ l- j @2
> add process p p > z l+ l- j j @3
> add process p p > z l+ l- j j j @4
>
> and then decay the Z using Madspin to keep spin correlations.
> The process keeps crashing during Madspin decay , probably due to the large multiplicity in the final state.
> Is it possible and would it help to split the generation of the 3jet multiplicity from the lower multiplicities ?
> If yes, what would be the generation run_card options in order to be able to merge the samples afterwards ?
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Andre Sznajder (andre-sznajder) said : 		#2

Hi Olivier,
Sorry for the lack ion information in the first message.
Indeed the problem was solved by splitting the generation of the "process p p > z l+ l- j j j @4" from the other ones.
It seems it was a limitation of condorHT at CERN due to the number of jobs and generation was being aborted.
Thanks anyway
Andre