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

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4. Algoritmo Particle Flow en la zona hacia delante

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4.a.i. Importancia del Analisis Particle Flow

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As you know, The majority of the interesting physics processes at the Linear Collider involves multi-jet final states. One of the goals of the Linear Collider detector performance is to be able to separate W and Z boson in their hadronic decay modes.
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As you know, The majority of the interesting physics processes at the Linear Collider involves multi-jet final states. One of the goals of the Linear Collider detector performance is to be able to separate W and Z boson in their hadronic decay modes.

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In order to achieve this goal, the jet energy resolution of detectors (E/E) is required to be as good as 30%/E(GeV?) . This is a factor two better than the best energy resolution achieved at LEP.
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In order to achieve this goal, the jet energy resolution of detectors (sigma E/E) is required to be as good as: ILC_goal_energy_resoltuion.jpg

This is a factor two better than the best energy resolution achieved at LEP.
Energy_resolution_P_Flow.jpg


To this end, ILD and SiD? detector will be have a finely segmented calorimeter optimized for particle flow analysis (PFA).

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This high energy resolution has direct impact in physics senstitivity: If the Higgs mechanism is not responsible for the Electroweak Symmetry Breaking (EWSB) then the Quantum Gaussian Channel (QGC) process important, and as you can see in the picture, this energy resolution will allow to separate W and Z jets
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This high energy resolution has direct impact in physics senstitivity: If the Higgs mechanism is not responsible for the Electroweak Symmetry Breaking (EWSB) then the Quantum Gaussian Channel (QGC) process important,
physics_sensitivity.jpg

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and as you can see in the picture, this energy resolution will allow to separate W and Z jets
separate_W_Z_jets.jpg

4.a.ii.Porque es interesante la zona hacia delante?

An application of the capability to distinguish between W and Z jets are the gauge boson pair production (e+e- WW, e+e-  ZZ). The gauge boson are typically very low angle emited (see Marcelís talk).

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The events for the ZZ production process are generated as: The W pair production is generated as:
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The events for the ZZ production process are generated as: ZZproduction.jpg

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The W pair production is generated as: WWproduction.jpg


  • Feynman_Diagram_Gauge_boson_decay.jpg

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  • ETD: Endcap Tracker Disks
  • ECAL Endcap
  • HCAL Endcap
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Area_analisis_forward_ILD.jpg
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Area_analisis_forward_ILD_angle.jpg

Some problem that we can find in the forward region are:

  • Noise occupancy due to pair production which affect track reconstrucion,
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-- Main.iglesias - 22 Dec 2008

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META FILEATTACHMENT Area_analisis_forward_ILD.jpg attr="" comment="" date="1229948937" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Area_analisis_forward_ILD.jpg" size="64244" user="iglesias" version="1.1"
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META FILEATTACHMENT Reconstruction_Framework.png attr="" comment="" date="1229949082" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Reconstruction_Framework.png" size="96922" user="iglesias" version="1.1"
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META FILEATTACHMENT ZZproduction.jpg attr="" comment="" date="1229957014" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\ZZproduction.jpg" size="879" user="iglesias" version="1.1"
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META FILEATTACHMENT Polar_angle_distribution_leptonic_decays.jpg attr="" comment="" date="1229957158" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Polar_angle_distribution_leptonic_decays.jpg" size="24689" user="iglesias" version="1.1"
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META FILEATTACHMENT ILC_goal_energy_resoltuion.jpg attr="" comment="" date="1229958171" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\ILC_goal_energy_resoltuion.jpg" size="3685" user="iglesias" version="1.1"
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META FILEATTACHMENT physics_sensitivity.jpg attr="" comment="" date="1229958203" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\physics_sensitivity.jpg" size="15753" user="iglesias" version="1.1"
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Revision r1.2 - 22 Dec 2008 - 12:10 - Main.iglesias
Revision r1.3 - 22 Dec 2008 - 15:02 - Main.iglesias