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4. Algoritmo Particle Flow en la zona hacia delante

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4.a.i. Introduccion

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El algoritmo Particle Flow empezo a desarrollarse en la era LEP, y tambien ha sido utilizado en Tevatron y en el LHC, tanto en CMS como en ATLAS (ver mi web de ATLAS: http://ific.uv.es/~iglesias), y para el futuro acelerador lineal ILC, los detectores ILD y SiD? adoptaran un diseño basado en el Particle Flow, porque este concepto promete alcanzar la resolucion en energia de los jets que se quiere conseguir.
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El algoritmo Particle Flow empezo a desarrollarse en la era LEP, y tambien ha sido utilizado en Tevatron y en el LHC, tanto en CMS como en ATLAS (ver mi web de ATLAS: http://ific.uv.es/~iglesias), y para el futuro acelerador lineal ILC, los detectores ILD y SiD adoptaran un diseño basado en el Particle Flow, porque este concepto promete alcanzar la resolucion en energia de los jets que se quiere conseguir.

Pero para este fin, Particle Flow requerie que se desarrolle una nueva tecnologia de detectores ademas de unos nuevos algoritmos de reconstruccion mas sofisticados.

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4.a.ii.Concepto de Particle Flow

As you know, in a typical jet, we have:
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  • 64% of jet energy in charged hadrons (mainly pion ±)
  • 25 % in photons (mainly from 0 decays)
  • 11 % in neutral hadrons (: mainly KL and neutrons)
About 2/3 of the jet energy are carried by charged particles (p,K...). However jet algorithm makes no use of tracking information
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  • 64% of jet energy in charged hadrons (mainly π±)
  • 25 % in photons (mainly from π→γγ decays)
  • 11 % in neutral hadrons (mainly KL and neutrons)
About 2/3 of the jet energy are carried by charged particles (protons, kaons...). However jet algorithm makes no use of tracking information

Particle Flow algorithm make an optimal use of the detector information combining the measurement of the energy deposition in calorimeter cells with the reconstructed track in the inner detector to improve jet energy resolution and ETMiss.

For ILC energies, the tracker is more precise than the calorimeters. As you can see in this picture, tracking is better than:

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  • ECAL for Epart < 120 GeV?
  • EHAD for Epart < 370 GeV?
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  • ECAL for Epart < 120 GeV
  • EHAD for Epart < 370 GeV

So for charged particles, their energy resolution will be sustituted by the track momentum resolution in order to have a better resolution in jet ET.
Energy_resolution_ILC.jpg
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Revision r1.3 - 22 Dec 2008 - 15:05 - Main.iglesias
Revision r1.4 - 23 Dec 2008 - 11:50 - Main.iglesias