Opened 10 years ago
Last modified 7 years ago
#548 new How to
External FastJet
Reported by: | iris | Owned by: | |
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Priority: | critical | Milestone: | |
Component: | Delphes code | Version: | Delphes 3 |
Keywords: | Cc: |
Description
Hi, I am completely new to this tool. I am using the MG5+Pythia+Delphes package.
I am trying to reproduce some published results using the MDF(mass drop filter) method. What should I do to change the FastJet code inside Delphes? Where can I find the initial code? Seems I need to run Delphes with external FastJet code?
Thanks in advance!
Change History (9)
comment:1 by , 10 years ago
Priority: | minor → critical |
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comment:2 by , 10 years ago
comment:3 by , 10 years ago
comment:4 by , 10 years ago
comment:5 by , 10 years ago
Thank you! I should state the question more clearly.
When dealing with the branch "Jet" in Delphes, can I undo the clustering?
To be precise, actually I need to undo the clustering and deal with the subjets. I dont know whether I should change the code in FastJet or analyze the resulting jets in Delphes root file (if so, how to undo the clustering to obtain the subjets?) ?
follow-up: 8 comment:6 by , 10 years ago
Hello, I found this on web and it is exactly the code I want:
My question is where I should paste it?
comment:7 by , 10 years ago
Hi,
my suggestion is that you have a separate Delphes and FastJet installation.
You have very detailed instructions for running FastJet using Delphes as an external library here:
https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/ExternalFastJet
After you did everything explained there, you can then simply modify the examples !ExternalFastJetHepMC.cpp or ExternalFastJetBasic.cpp
by plugging in the fast jet code you mentioned above.
Cheers,
Michele
comment:8 by , 7 years ago
Replying to iris:
Hello,
I am doing some event generation using MG5+Pythia+Delphes packages.
Now, I am trying to reproduce higgs invariant mass using mass-dropp tagging method.
How I compile that Fastjet (.cc file) and Delphes root file.
How I reproduce higgs invariant mass plot?
Thanks in advance.
comment:9 by , 7 years ago
Hi,
you'll have to:
- produce an hepmc file with madGraph
- install standalone Delphes version
- follow instructions here:
https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/ExternalFastJet
This allows you to run Delphes with your own fastjet code.
Hi,
I'm not sure if I understand your questions correctly (for instance, what do you mean by "the initial code"?).
Anyway, there are two possibilities to use a different version of FastJet:
https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/ExternalFastJet
You'll most probably need to slightly modify update_fastjet.sh.
Cheers,
Pavel