Substructure variables from fast jet to delphes

[Francesco Spanò]

Hello,
I would like to know if it is possible to have some substructure variable that are obtainable through Fastjet(like Nsubjettines, d12 splitting scale) in the Delphes root output and if there are examples on how to do this. I see an initial example in the delphes tutorial ​http://indico.cern.ch/event/315979/#preview:834933. However I am not sure how I can interact with fast jet in delphes, maybe I have not read enough material. Any pointer/help on this would be really helpful.
Best,
Francesco Spanò

[Michele Selvaggi]

for a set of predefined substructure variables you can have a look here:
https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/Modules#FastJetFinder

these are already implemented in the FastJetFinder module.
If you want more, you have two options:

• either you add what you need in the module (you also have to add the new variables to Jet/Candidate classes and in the TreeWriter module). This should be explained in the tutorial you are following.
• either you run with your own fastjet installation. This will leave you more flexibility. you can have a look on how to do that here:

https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/ExternalFastJet

Michele