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reconstruction particles [message #1502] Thu, 12 June 2008 04:37
rwaliczek
Messages: 6
Registered: April 2008
Location: Institute of Nuclear Phys...
Hello everybody,
I am a student at Institute of Nuclear Physics in Cracow and I am trying to get some information from my collections. I simulated e+e-->ttbar beam at 500GeV in CMS (pythia generator + mokka).Now I`m studying Marlin and I need some help about this software. I used a "example_steering_file_LDC01_05Sc.xml" from $ILCSoft/PandoraPFA folder. I obtain "output_file.slcio" which has a lot of collections.
My questions are the following:

1. I need information about momentum reconstructed particles. I know that this info include "MCParticle" collection(getMomentum()), but there is info about simulated particles, which caused hit. Where can I obtain info about momentum reconstructed particles in order to histogramming and compare with simulated?

2. I understand that all "Sim.." collections are simulated from Mokka and using to other processors as primary input collections to further reconstruction. There is info about position (getPostion())- Does this function return "x,y,z" or "r,phi,z" in polar coordinate system?

3. Can I get info about momentum particles from "TrackerHit" and "Track" collections? Do exist any method to compute it from this collection?

4. In "ReconstructedParticle" collection I find a getMomentum() function, but there is only few low energy particles(pi+,pi-,neutrons,photons) - Is it correct?? Does collection "ReconstructedParticle" is the only, which contain reconstructed particles from name? i.e. Does Pandora is such intelligent that can reconstructed W+W- bosons from ttbar and tell me: there are W bosons Smile??

5. How can I obtain total energy distribution reconstructed particles? Which collections include such information?

The last most lamers question: What kind of information I can get from reconstructed collection (what is the most ineteresting in this type of simulations: e+e- -> ttbar)?

Thanks in advance

[Updated on: Thu, 12 June 2008 04:42]

 
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