MadGraph5_aMC@NLO

MSSM Pair Production and Matching

Asked by Matthew Low

Hi,

I'm wondering about the correct matching procedure for p p > n1 n1 where I want to match 0,1,2 jets. For the 1-jet processes there is a process with a s-channel quark that cannot be reproduced from a 0-jet process with a radiated jet (likewise for the 2-jet process there is a process that isn't from a 1-jet process+radiation). This sounds like it is the same as the single top matching example where by default Pythia won't treat it correctly.

Do I need to use MAXJETS to do this correctly? If I understand the MadGraph matching writeups does that mean I need to match 0,1,2,3 jets and then use MAXJETS=2 to do 2 jets correctly? Is there a way to do it correctly without having to compute pair production + 3 jets?

Thanks,
- Matthew

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Matthew,

I think that in that case you just have to forbid the s-channel quark:
As indicated here:
https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/IntroMatching#MatchinginBSMprocesses

This can also be done by generating the one jet multiplicity with the $ syntax.

Cheers,

Olivier
On Dec 7, 2013, at 12:16 AM, Matthew Low <email address hidden> wrote:

> New question #240417 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/240417
>
> Hi,
>
> I'm wondering about the correct matching procedure for p p > n1 n1 where I want to match 0,1,2 jets. For the 1-jet processes there is a process with a s-channel quark that cannot be reproduced from a 0-jet process with a radiated jet (likewise for the 2-jet process there is a process that isn't from a 1-jet process+radiation). This sounds like it is the same as the single top matching example where by default Pythia won't treat it correctly.
>
> Do I need to use MAXJETS to do this correctly? If I understand the MadGraph matching writeups does that mean I need to match 0,1,2,3 jets and then use MAXJETS=2 to do 2 jets correctly? Is there a way to do it correctly without having to compute pair production + 3 jets?
>
> Thanks,
> - Matthew
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Revision history for this message
Matthew Low (mattlow) said : 		#2

Thanks Olivier Mattelaer, that solved my question.