<<O>>  Difference Topic AlgoritmoParticleFlowEnLaZonaHaciaDelante (r1.4 - 23 Dec 2008 - Main.iglesias)

META TOPICPARENT WebHome

4. Algoritmo Particle Flow en la zona hacia delante

Line: 9 to 9

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.

Changed:
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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:
>
>
In order to achieve this goal, the jet energy resolution of detectors (σE/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.

Line: 28 to 28

separate_W_Z_jets.jpg

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

Changed:
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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 Marcel’s talk).
>
>
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 Marcel’s talk in 8th SiLC Meeting).

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

The W pair production is generated as: WWproduction.jpg

Line: 40 to 40

If only leptonic decays of W and Z bosons are considered, the polar angle distribution of e- and e+ from both processes is extremely peaked in the forward direction. At Ecm=500 GeV? two thirds of e- are emitted with < 30o or > 150o. At larger energy the tendency for e- to be emitted in the very forward direction becomes even more pronounced. The polar angle distribution of muons and -leptons is more central but still a considerable fraction is to be reconstructed in the forward detector: for the ZZ events, (~60 %).

Added:
>
>

Polar_angle_distribution_leptonic_decays.jpg

Changed:
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<

Therefore, these processes form a very strong physics case for a low-angle reconstruction with great precision. So, where Particle Flow is really usefull for improvement the enegy resolution is in the Forward Region

>
>
Therefore, these processes form a very strong physics case for a low-angle reconstruction with great precision. So, we can say that where Particle Flow is really usefull for improvement the enegy resolution is in the Forward Region.

4.a.iii.Problemas en la zona hacia delante en ILD

Our area of study will be: theta 30-10 degrees, so the jets will pass throught:
Line: 57 to 58

Area_analisis_forward_ILD_angle.jpg

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

Changed:
<
<
  • Noise occupancy due to pair production which affect track reconstrucion,
>
>
  • Noise occupancy due to pair production which affect track reconstrucion: When the two bunches of the ILC collide, the electrons are disturbed by the electromagnetic field of the incoming bunch. Under this influence, the electrons radiate photons (an effect known as beamstrahlung). The produced photons may convert into pairs of an electron and a positron through one of the processes whose diagrams are depicted in the figure below:
    Beamstrahlung_pair_production.jpg

The large majority is soft and/or emitted at low angle and are trapped in the “accumulation zone”.
accumulative_Zone.jpg


  • Less favourable orientation of the magnetic field,
  • the amount of material along the particle trajectory,
Changed:
<
<
  • the degradation of the electromagnetic resolution due to the TPC EndPlate? (Which difficult the identification of e- and photons)…
>
>
  • Abundant low momentum tracks: Tracks below a given pT curl up and “loop” through the detector, leaving through the endcap. For a Bfield of 4 Tesla and a radius of over 1.5 m, pT = 0.3 B R = nearly 2 GeV?. A challenge for reconstruction due to Multiple Scattering
    Low_momentum_tracks.jpg

  • the degradation of the electromagnetic resolution due to the TPC EndPlate (Which difficult the identification of e- and photons)…

For the aplication of the Particle Flow algorithm, we also will have the problem to extrapolate track from TPC to ECAL matching TPC hits with ECAL cluster using information from  the Endcap Tracker Disks (between TPC end-plate and the face of ECAL endcap)as well as take into account the energy loss in TPC endplate

Line: 104 to 113

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Changed:
<
<
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 Energy_resolution_P_Flow.jpg attr="" comment="" date="1229958184" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Energy_resolution_P_Flow.jpg" size="10462" user="iglesias" version="1.1"
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Added:
>
>
META FILEATTACHMENT accumulative_Zone.jpg attr="" comment="" date="1230033681" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\accumulative_Zone.jpg" size="33407" user="iglesias" version="1.1"
META FILEATTACHMENT Beamstrahlung_pair_production.jpg attr="" comment="" date="1230033694" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Beamstrahlung_pair_production.jpg" size="16817" user="iglesias" version="1.1"
META FILEATTACHMENT Low_momentum_tracks.jpg attr="" comment="" date="1230033989" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Low_momentum_tracks.jpg" size="50405" user="iglesias" version="1.1"
 <<O>>  Difference Topic AlgoritmoParticleFlowEnLaZonaHaciaDelante (r1.3 - 22 Dec 2008 - Main.iglesias)

META TOPICPARENT WebHome

4. Algoritmo Particle Flow en la zona hacia delante

Line: 7 to 7

4.a.i. Importancia del Analisis Particle Flow

Changed:
<
<
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.
>
>
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.

Changed:
<
<
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.
>
>
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).

Changed:
<
<
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
>
>
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

Added:
>
>
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 Marcel’s talk).

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

Added:
>
>
The W pair production is generated as: WWproduction.jpg


  • Feynman_Diagram_Gauge_boson_decay.jpg

Line: 40 to 53

  • ETD: Endcap Tracker Disks
  • ECAL Endcap
  • HCAL Endcap
Deleted:
<
<


Changed:
<
<
Area_analisis_forward_ILD.jpg
>
>
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,
Line: 79 to 91

-- Main.iglesias - 22 Dec 2008

Changed:
<
<
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"
>
>

META FILEATTACHMENT Area_analisis_forward_ILD.jpg attr="" comment="" date="1229957347" 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="39600" user="iglesias" version="1.2"

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"
Added:
>
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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"
META FILEATTACHMENT WWproduction.jpg attr="" comment="" date="1229957023" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\WWproduction.jpg" size="950" user="iglesias" version="1.1"
META FILEATTACHMENT Feynman_Diagram_Gauge_boson_decay.jpg attr="" comment="" date="1229957035" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Feynman_Diagram_Gauge_boson_decay.jpg" size="12177" user="iglesias" version="1.1"
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"
META FILEATTACHMENT Energy_resolution_P_Flow.jpg attr="" comment="" date="1229958184" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\Energy_resolution_P_Flow.jpg" size="10462" user="iglesias" version="1.1"
META FILEATTACHMENT separate_W_Z_jets.jpg attr="" comment="" date="1229958194" path="C:\Users\iglesias\Documents\My_Work_USC\My_Work\ILC_my_work\Presentaciones\Plot_Particle_Flow_SiLC_Meeting\separate_W_Z_jets.jpg" size="29523" user="iglesias" version="1.1"
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"
 <<O>>  Difference Topic AlgoritmoParticleFlowEnLaZonaHaciaDelante (r1.2 - 22 Dec 2008 - Main.iglesias)

META TOPICPARENT WebHome
Changed:
<
<
  • 4. Algoritmo Particle Flow en la zona hacia delante
    • c. Algoritmo Particle Flow en la zona hacia delante
      • Importancia del Analisis Particle Flow
>
>

4. Algoritmo Particle Flow en la zona hacia delante

4.c. Algoritmo Particle Flow

4.a.i. Importancia del Analisis Particle Flow


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.

Line: 14 to 17

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
Changed:
<
<
      • Porque es interesante la zona hacia delante?
>
>

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 Marcel’s talk). The events for the ZZ production process are generated as:

Line: 28 to 31

Therefore, these processes form a very strong physics case for a low-angle reconstruction with great precision. So, where Particle Flow is really usefull for improvement the enegy resolution is in the Forward Region

Added:
>
>

4.a.iii.Problemas en la zona hacia delante en ILD

Our area of study will be: theta 30-10 degrees, so the jets will pass throught:
  • VTX: Vertex detector
  • SIT: Silicon Intermediate Tracker
  • FTD: Forward Tracking Disks
  • TPC: Time Projection Chamber
  • ETD: Endcap Tracker Disks
  • ECAL Endcap
  • HCAL Endcap


Area_analisis_forward_ILD.jpg

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

  • Noise occupancy due to pair production which affect track reconstrucion,
  • Less favourable orientation of the magnetic field,
  • the amount of material along the particle trajectory,
  • the degradation of the electromagnetic resolution due to the TPC EndPlate? (Which difficult the identification of e- and photons)…

For the aplication of the Particle Flow algorithm, we also will have the problem to extrapolate track from TPC to ECAL matching TPC hits with ECAL cluster using information from  the Endcap Tracker Disks (between TPC end-plate and the face of ECAL endcap)as well as take into account the energy loss in TPC endplate

4.a.iv.Aplicacion del algoritmo Particle Flow en la zona hacia delante de ILD

We are in a very preliminary status in the application of the Particle Flow Algorithm in the Forward Region, because I have been only 1 month using ILC software and still will be need to familiarize with the Marlin Framework and PFA code…) but ...

We want to study in the Forward Region the impact of different factors (related with the FTD) in the final energy resolution obtained applying PFA.

  • The impact of the material in the FTD , evaluated in terms of:
    • Momentum resolution of the electrons
    • Efficiency in the electron detection
    • Conversions photons
  • The impact of the track reconstruction efficiency , evaluated in terms of:
    • Track finding efficiency
    • fake track rate

Other analysis useful for the application of PFA in Forward Region:

  • The impact of the EndCap Tracker Disck (ETD) in the matching track-cluster
  • The impact of the position of the first disk of the FTD (closer of VTX) in the reconstruction of the track

And another interesting analysis can be the study of the impact of:

  • The impact of the bremstralung background, because the noise occupancy due to pair production which affect track reconstrucion
  • the size of the detector: the Radius, the TPC lenght...
  • the magnetic Field: its value, its unfavorable orientation
  • the characteristics of the calorimeters: the ECAL granularity, the HCAL depth…

-- 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"
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"
 <<O>>  Difference Topic AlgoritmoParticleFlowEnLaZonaHaciaDelante (r1.1 - 22 Dec 2008 - Main.iglesias)
Line: 1 to 1
Added:
>
>
META TOPICPARENT WebHome
  • 4. Algoritmo Particle Flow en la zona hacia delante
    • c. Algoritmo Particle Flow en la zona hacia delante
      • Importancia del Analisis Particle Flow

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.

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.

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

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

      • 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 Marcel’s talk). The events for the ZZ production process are generated as: The W pair production is generated as:

If only leptonic decays of W and Z bosons are considered, the polar angle distribution of e- and e+ from both processes is extremely peaked in the forward direction. At Ecm=500 GeV? two thirds of e- are emitted with < 30o or > 150o. At larger energy the tendency for e- to be emitted in the very forward direction becomes even more pronounced. The polar angle distribution of muons and -leptons is more central but still a considerable fraction is to be reconstructed in the forward detector: for the ZZ events, (~60 %).

Therefore, these processes form a very strong physics case for a low-angle reconstruction with great precision. So, where Particle Flow is really usefull for improvement the enegy resolution is in the Forward Region

-- Main.iglesias - 22 Dec 2008

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Revision r1.1 - 22 Dec 2008 - 09:54 - Main.iglesias
Revision r1.4 - 23 Dec 2008 - 11:55 - Main.iglesias