<<O>>  Difference Topic AlgoritmoParticleFlow (r1.3 - 22 Dec 2008 - Main.iglesias)

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4. Algoritmo Particle Flow en la zona hacia delante

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Traditional calorimetric approach:

  • Measure all components of jet energy in ECAL/HCAL !
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  • ~70 % of energy measured in HCAL:
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  • ~70 % of energy measured in HCAL: HCAL_energy_resolution.jpg

  • Intrinsically “poor”HCAL resolution limits jet energy resolution


Line: 49 to 49

The idea is, for a detector ideal in separating the different particles:

  • The charged tracks will be measured from the tracker
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  • The photons from the Ecal:
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  • The photons from the Ecal: ECAL_energy_resolution.jpg

  • And only the neutral hadrons will be measured in the Hcal (and possibly in Ecal)
So, only 10 % of jet energy from HCAL  much improved resolution
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4.a.v. La calorimetria con Particle Flow

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In practice, particle flow performance depends on the ability to associated energy deposits without double counting or merging energy deposits. This places stringent requirements on the granularity of ECAL and HCAL and, consequently, Particle Flow performance is one of the main factors driving the overall detector design.

The jet energy resolution obtained is the combination of the detector and PFA software performance.


4.a.vi.Como funciona el Particle Flow?

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The crucial step of the particle flow algorithm is the correct assignment of calorimeter hits to the charged particles and the efficient discrimination of close-by showers produced by charged and neutral particles.

The main steps in the Particle Flow algorithm are:

  • Track Reconstruction
  • Extrapolate track to calorimeters
  • Assign MIP to stubs to tracks
  • Clustering in calorimeters
  • Particle ID for Charged particle
  • Removed charged particle hits in calorimeter
  • Clustering of neutral hits
  • Particle ID for neutral


howPFworks.jpg


-- Main.iglesias - 22 Dec 2008

Line: 88 to 111

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Revision r1.2 - 22 Dec 2008 - 12:09 - Main.iglesias
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