MadAnalysis 5

Distinguish leptonic jets from hadronic jets

Asked by JamesB

Hello,

I have created parton level events with Madgraph and showered them with Pythia8. Next I have performed jet clustering and detector effects using Delphes through Madanalysis.

My question is based on the output after Delphes:
How can I distinguish leptonic jets from hadronic jets (my events have both)? In the ROOT file I am using I can't see any way to distinguish them. Perhaps some condition on delta(R) between lepton and jet, but I have no idea how to set this condition (either through Delphes, Madanalysis or altering the card I am using (delphes_ATLAS).

Thank you for your help,
James

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Benjamin Fuks
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Revision history for this message
Benjamin Fuks (fuks) said : 		#1

Hi James,

You can indeed select/reject electrons that are well separated from a jet. This is the way to go. But this has to be done offline, at the level of the analysis.

Cheers,

Benjamin

> On 31 Jan 2018, at 18:52 , JamesB <email address hidden> wrote:
>
> New question #663919 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/663919
>
> Hello,
>
> I have created parton level events with Madgraph and showered them with Pythia8. Next I have performed jet clustering and detector effects using Delphes through Madanalysis.
>
> My question is based on the output after Delphes:
> How can I distinguish leptonic jets from hadronic jets (my events have both)? In the ROOT file I am using I can't see any way to distinguish them. Perhaps some condition on delta(R) between lepton and jet, but I have no idea how to set this condition (either through Delphes, Madanalysis or altering the card I am using (delphes_ATLAS).
>
> Thank you for your help,
> James
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Revision history for this message
JamesB (jamesb8) said : 		#2

Hello Benjamin,

>> But this has to be done offline, at the level of the analysis.

Does this mean this should be set in the Delphes card that I use?

Revision history for this message
Best Benjamin Fuks (fuks) said : 		#3

Hi James,

No. This has to be implemented at the level of your analysis. Not at the level of the reconstruction.

Regards,

Benjamin

> On 31 Jan 2018, at 21:22 , JamesB <email address hidden> wrote:
>
> Question #663919 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/663919
>
> Status: Answered => Open
>
> JamesB is still having a problem:
> Hello Benjamin,
>
>>> But this has to be done offline, at the level of the analysis.
>
> Does this mean this should be set in the Delphes card that I use?
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Revision history for this message
JamesB (jamesb8) said : 		#4

Thanks Benjamin Fuks, that solved my question.