Opened 5 years ago
Last modified 5 years ago
#1412 new How to
Branches in Delphes Root File and Distinguishing Among Particles.
| Reported by: | usernew | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | Delphes code | Version: | Delphes 3 |
| Keywords: | mother, daughter, branch, root | Cc: |
Description
Hello, I am just learning a few things with Delphes and I have a basic question if you do not mind. I am working with a p p collision in MadGraph. I am looking at the Delphes root file that is outputted after the events have been generated in MadGraph. Why is it when looking at the Branches in Delphes I only see Particles, Muons, Electrons, and Photons. But if I am running a simple example like p p > z > mu+ mu- , why can I not see a z boson branch, for example. What if I had a process that decay to quarks, as another example. How can I look at those quarks? I am asking this to hopefully know how to work with more complicated process where I would have more than one z boson particle I need to look at. If a process contains for example two particles that decayed to 3 identical particles (that are neither muons, electrons, or photons) how can I distinguish among those 3 particles? Does mother or daughter particles give any further info?
Thank you
Change History (2)
comment:2 by , 5 years ago
One of many possible approaches is kinematic fitting:
http://cms.cern.ch/iCMS/jsp/openfile.jsp?type=NOTE&year=2006&files=NOTE2006_023.pdf
https://arxiv.org/abs/1312.5595
https://github.com/KLFitter/KLFitter
Delphes only parametrizes the response of the detector and of the event reconstruction algorithm. What you ask for is normally done by the analysis algorithm that is the next step after the reconstruction.