PFA Study with Jupiter
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9/29/2006 FJPPL Meeting@KEK 1
PFA Study with Jupiter
Contents :1. Introduction2. GLD-PFA3. Z->qqbar Study4. Zh Study5. Summary
FJPPL Meeting @ KEKSeptember 29th, 2006
Tamaki Yoshioka ICEPP, Univ. of Tokyo
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Introduction- Most of the important physics processes to be studied in the ILC experiment have multi-jets in the final state. → Jet energy resolution is the key in the ILC physics.
- The best energy resolution is obtained by reconstructing momenta of individual particles avoiding double counting among Trackers and Calorimeters.
- Charged particles (~60%) measured by Tracker.- Photons (~30%) by electromagnetic CAL (ECAL).- Neutral hadrons (~10%) by ECAL + hadron CAL (HCAL).
→ Particle Flow Algorithm (PFA)
- In this talk, general scheme and performance of the GLD-PFA, using the GEANT4-based full simulator (Jupiter), will be presented.
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Geometry in Jupiter
Muon Detector
Solenoid
Hadron Calorimeter (HCAL)
Electromagnetic Calorimeter (ECAL)
TPC
VTX, IT
Dodecagonal ShapeAs of August 06
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229.8cm
349.4cm
299.8cm419.4cm
Readout Line =10cm
270cm
Endcap.InnerRadius=40cm
BarrelHD
BarrelEM
EndcapEM
EndcapHD
Barrel.InnerRadius=210cm
Barrel.HalfZ=280cm
210cm
280cm
Calorimeter Geometry in Jupiter
IP
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Calorimeter Structure
ECALW/Scinti./Gap
3/2/1 (mm) x 33 layers
HCALFe/Scinti./Gap
20/5/1 (mm) x 46 layers
Absorber
Active Layer
Current cell size :2x2cm
Can be changed.
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9/29/2006 FJPPL Meeting@KEK 6
GLD-PFA
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9/29/2006 FJPPL Meeting@KEK 7
Particle Flow Algorithm for GLD
Flow of GLD-PFA
1.Photon Finding 2.Charged Hadron Finding3.Neutral Hadron Finding4.Satellite Hits Finding *Satellite hits = calorimeter hit cell which does not belong
to a cluster core
Note : Monte-Carlo truth information is used for muonand neutrino.
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Photon Likelihood (Input)
trkdis velocity meanlay
Edep/nhits chi2
Photon
Other
- Five variables are selected to form the photon likelihood function.
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Photon Likelihood (Output)
- Cut position is set to be 0.7.
linear
log
PhotonOther
Photon
Other
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Charged Hadron Finding- Basic Concept : Extrapolate the charged track and calculate a distance between a calorimeter hit cell and the extrapolated track. Connect the cell that in a certain tube radius (clustering).
Charged TrackCalorimeter input position
Hit Cellsdistance
ECAL
HCAL
- Tube radius for ECAL and HCAL can be changed separately.
- Calculate the distance for any track/calorimeter cell combination.
Extrapolated Track
Tube Radius
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Neutral Hadron Likelihood (Input)- Four variables are selected to form the NHD likelihood function.
Neutral Hadron
Satellite Hits
velocity Edensity
Edep/nhits meanlayer
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Neutral Hadron Likelihood (Output)
- Cut position is set to be 0.73.
linear
log
NeutralHadron
SatelliteHits
Neutral Hadron
Satellite Hits
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Z -> qqbar
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Z-pole Event Display
End View Side View
- 2cm x 2cm tile (GLD backup solution) is used in this study.
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9/29/2006 FJPPL Meeting@KEK 15Next: 電子、陽電子衝突
e+
e-
Event Display
Yellow : Photon
Red, Green : Charged Hadron
Black, Blue : Neutral Hadron Z → qqbar @ 91.2GeV
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Yellow : Photon
Red, Green : Charged Hadron
Black, Blue : Neutral Hadron
Event Display
Gamma Finding
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Yellow : Photon
Red, Green : Charged Hadron
Black, Blue : Neutral Hadron
Event Display
Charged Hadron Finding
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Yellow : Photon
Red, Green : Charged Hadron
Black, Blue : Neutral Hadron
Event Display
Satellite Hits Finding
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Yellow : Photon
Red, Green : Charged Hadron
Black, Blue : Neutral Hadron
Event Display
Remaining : Neutral Hadron
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cluster type e photon e chd e nhd Pphoton Pchd PnhdPhoton 93.6 1.88 18.5 87.21 3.57 7.53
CHD 2.44 85.8 12.8 1.31 93.8 3NHD 1.07 3.6 52.8 3.28 22.7 70.7
Satellite 2.86 8.74 15.8 10.20 63.9 24.8
Definition
Efficiency : exxx (total xx E in collected hits)/(true xxx total E in CAL)
Purity : Pxxx (total xxx E in a cluster)/(total E in a cluster)
xxx = Photon, CHD, NHD, Satellite
both e and P values are energy-weighted
Performance
- Energy-weighted Efficiency and Purity
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- In barrel region, ILC goal of 30% has been achieved.- Performance in 0.7<|cosθ|<0.8 is too bad. → Already fixed.
All angle
- Z → uds @ 91.2GeV, new calorimeter geometry, 2cm x 2cm tile
Jet Energy Resolution
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Energy Dependence- Energy dependence of jet energy resolution.
- Bad performance for higher energy.- Not so bad performance for < 100 GeV Jet.
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Linearity
- Good linearity. Jet energy can be corrected.
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Zh → h
First look at the Zh events with Jupiter and realistic PFA.
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Typical Event Display
- Two jets from Higgs can be seen.
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Zh → h @ 350GeV
- Jet energy is corrected by an empirical formula obtained by Z → qqbar studies.- Selection Criteria
- 90 < Evis < 200 GeV - pt >20 GeV/c
Higgs Mass Visible Energy
Missing Mass
- Fast MC• w/o correction• w/ correction
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Kinematical Fit- 6 Measured Variables
Jet1 : Ej1, j1, j1
Jet2 : Ej2, j2, j2 (Note : Ej1 > Ej2)- 3 Unmeasured Variables
Z0 : Ez, z, z
- 4 Constraintspj1cosj1sinj1pj2cosj2sinj2pZcosZsinZpj1sinj1sinj1pj2sinj2sinj2pZsinZsinZpj1cosj1pj2cosj2pZcosZEj1 + Ej2 + Ez – Ecm = 0
(Note: jet mass is fixed : pfit = √{Efit2
– (Emeas2 – pmeas
2)} )
→ 1C-fit can be performed.
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Fitted Results
Prob > 0.02
- Higgs mass resolution is significantly improved. … But,- Peak at prob=1 indicates the fitting didn’t work well.
Very Preliminary
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Stretch Functions
2,
2,
,,
ifitimeas
ifitimeas XX
• The stretch function should form a normal Gaussian if the X and are proper.
Too Narrow= Overestimated
Strange
Need tounderstand.
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Summary
• Realistic PFA has been developed using the GEANT-4 based full simulator of the GLD detector.
• Jet energy resolution is studied by using Z->qq events. ILC goal of 30% has been achieved for Z-pole events.
• ZH study based on current PFA performance is now ongoing.