jet matching in the process p p > go go(+j) , go > j j n1

Additionally,
Note that you do not remove the gluino-squark contribution from the 1 jet sample.
Is this on purpose?

Cheers,

Olivier
> On 31 Jan 2017, at 17:03, Dong Xu <email address hidden> wrote:
>
> New question #449157 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/449157
>
> Hi,
> I am trying to do the matching proton+proton>gluino+gluino+(+j), gluino>jet+jet+neutralino.
> generate p p > go go , go > j j n1
> add process p p > go go j , go > j j n1
>
> Among, the j definition is j = g u u~ d d~ s s~ c c~
> but in the "launch" step, some errors appear, as follow
>
>
> Using random number seed offset = 21
> INFO: Running Survey
> Creating Jobs
> Working on SubProcesses
> INFO: P2_gg_gogog_go_qqn1_go_qqn1
> INFO: P2_gq_gogoq_go_qqn1_go_qqn1
> Error detected in "generate_events run_01"
> write debug file /home/xudong/LHC/MadGraph/MG5_aMC_v2_5_2/MYPROC/run_01_tag_1_debug.log
> If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
> MadGraph5Error : A compilation Error occurs when trying to compile /home/xudong/LHC/MadGraph/MG5_aMC_v2_5_2/MYPROC/SubProcesses/P2_gq_gogoq_go_qqn1_go_qqn1.
> The compilation fails with the following output message:
> gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -w -c symmetry.f -I../../Source/
> gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -w -c idenparts.f -I../../Source/
> gfortran: internal compiler error: Killed (program f951)
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://bugs.opensuse.org/> for instructions.
> makefile:60: recipe for target 'symmetry.o' failed
> make: *** [symmetry.o] Error 4
>
> Please try to fix this compilations issue and retry.
> Help might be found at https://answers.launchpad.net/mg5amcnlo.
> If you think that this is a bug, you can report this at https://bugs.launchpad.net/mg5amcnlo
>
>
> However, when I change the definition of jet, to include only two flavors of quarks, that is j = g u u~ d d~, there is no error in the "launch" step.
>
> Can you tell me something about this?
>
>
> Thanks so much for your help!
>
> Best,
> Dong Xu
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi, Olivier,
What do you mean by "you do not remove the gluino-squark contribution from the 1 jet sample."?

Thanks,
Dong Xu

Hi,

I mean that you have the contribution
p p > sq go, sq > go j
In general the onshell contribution of this diagram is not include in a matched generation.
(Because 1 the matching scale for such process might be different and second, since this will double count squark gluing production)

Cheers,

Olivier

> On 31 Jan 2017, at 19:07, Dong Xu <email address hidden> wrote:
>
> Question #449157 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/449157
>
> Status: Answered => Open
>
> Dong Xu is still having a problem:
> Hi, Olivier,
> What do you mean by "you do not remove the gluino-squark contribution from the 1 jet sample."?
>
> Thanks,
> Dong Xu
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

hi, Olivier,
In my process below,
generate p p > go go , go > j j n1
add process p p > go go j , go > j j n1

I think there is no contribution from p p > sq go , sq > go j, right?

Thanks!
Dong Xu

I think that you do but this might depend of the model that you use and how the model builder implement the model.
The only way to be sure is to look at the Feynam diagram.

For this kind of process, the advise syntax is to use the “$” which forbids the sub-sequent particle to be on shell.
Define sq= ul ul~ ur ur~
add process p p > go go j $ sq , go > j j n1
(If you do not know such syntax look at the following tutorial: https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/Shanghai2015/Tutorial_shangai_basic_mg5.pdf

Cheers,

Olivier

On 31 Jan 2017, at 20:58, Dong Xu <<email address hidden><mailto:<email address hidden>>> wrote:

Question #449157 on MadGraph5_aMC@NLO changed:
https://answers.launchpad.net/mg5amcnlo/+question/449157

   Status: Answered => Open

Dong Xu is still having a problem:
hi, Olivier,
In my process below,
generate p p > go go , go > j j n1
add process p p > go go j , go > j j n1

I think there is no contribution from p p > sq go , sq > go j, right?

Thanks!
Dong Xu

--
You received this question notification because you are an answer
contact for MadGraph5_aMC@NLO.

Hi, Olivier,
Actually, I have already set the mass of other particles in mssm to be like 5 * 10^3 Gev, which will forbid sq to be on shell. Sorry for forgetting to mention. Anyway, thanks so much for your answer!

Best,
Dong Xu

Thanks Olivier Mattelaer, that solved my question.