Summary of Simulation and Reconstruction

1
Summary of Simulation and Reconstruction

• Shaomin CHEN (Tsinghua University)

• Framework and toolkit
• Application in ILC detector design

Jupiter/Satellites, Mokka/Marlin, Slic/org.lcsim
GLD calorimeter LDC HCAL CALICE data processing
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Four ILC Detector Concepts

• GLD
• LDC
• SiD
• 4th detector concept

Large, 3T B-field
Most of physics studies rely on precise
measurement on multi-jets in the final state.
Medium, 4T B-field
Small, 5T B-field
Particle Flow Algorithm (see Tamaki
Yoshiokas talk)
See John Hauptmans talk
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Framework and Toolkit

• Jupiter/Satellites (Aisa)
• Mokka/Marlin (Europe)
• Slic/org.lcsim (US)

• For large option (GLD) design
• Use ROOT as a framework for data model

Ties Behnkes talk

• For medium option (LDC) design
• Use LCIO as a framework for data model

Norman Grafs talk

• For small option (SiD) design
• Use LCIO as a framework for data model

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Jupiter/Satellites Concepts
For real data
Tools for simulation Tools
Satellites
JUPITER
URANUS
METIS
Input/Output module set
IO
JLC Unified Particle Interaction and Tracking
EmulatoR
Unified Reconstructionand ANalysis Utility Set
Monte-Calro Exact hits To Intermediate Simulated
output
LEDA
Library Extention forData Analysis
Geant4 based Simulator
JSF/ROOT based Framework
MC truth generator
Event Reconstruction
JSF the analysis flow controller based on ROOT
The release includes event generators,
Quick Simulator, and simple event display
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Mokka/Marlin concepts
LCGEO
Ties Behnkes talk
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What is not there
Ties Behnkes talk
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Slic/org.lcsim concepts
LCDD
slic
lcio
Full simulation
Norman Grafs talk
Fast simulation
GODL
lcio
lelaps
GeomConverter
Compact Description
HEPREP
wired
Linear Collider Detector Description Simulator
for the LInear Collider Generalized Object
Description Language
org.lcsim Analysis Reconstruction
Stdhep and LCIO files for signal and Background
avaliable on the web
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Three merge into one?
Jupiter/Satellites
Mokka/Marlin
Slic/org.lcsim
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Application in Detector Design

• Detector optimization using PFA
• Calorimeter segmentation study
• Pion-zero reconstruction in ECALHCAL
• Isolated gamma finding in ECAL
• HCAL optimization using PFA

Tamaki Yoshiokas talk
Hiroaki Onos talk
Daniel Jeans talk
Hitoshi Hanos talk
Ties Behnkes talk
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Particle Flow Algorithm (PFA)

• ILC detectors are required good jet energy
  resolution for the precise measurement of jetty
  events.
• Jet energy measured by
• Charged (60) Tracker
• Photon (30) EM calorimeter
• Neutral hadron (10) EM/HD calorimeter
• Required performance to separate W/Z mass.

Hiroaki Onos talk
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Calorimeter Geometry in Jupiter
Readout Line 10cm
349.4cm
Solenoid
TPC
Barrel HCAL
229.8cm
Barrel ECAL
210cm
270cm
Endcap HCAL
VTX, IT
Endcap ECAL
Barrel.InnerRadius210cm
Endcap.InnerRadius40cm
IP
Barrel.HalfZ280cm
419.4cm
299.8cm
280cm
Tamaki Yoshiokas talk
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Calorimeter Structure
Active Layer
Absorber
Current cell size 1x1cm Can be changed.
ECAL W/Scinti./Gap 3/2/1 (mm) x 33 layers
HCAL Fe/Scinti./Gap 20/5/1 (mm) x 46 layers
Tamaki Yoshiokas talk
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Optimization using PFA
With the PFA, we can start detector configuration
optimization. - B-field - Calorimeter inner
radius - Hadron Calorimeter depth - Calorimeter
absorber material - TPC endplate thickness
- Calorimeter granularity (Ono-sans talk) -
etc
Check jet Energy resolution
Physics events Z?qq(uds) at 91.2 GeV and 350 GeV
Tamaki Yoshiokas talk
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Calorimeter Segmentation

• We studied the cheated/realistic PFA performance
  with different cell/strip segmentation.
• In cheated PFA, Z-gtqq event has analyzed and
  charged and neutral cluster overlapping
  contribute
• Ecm91GeV Almost no segmentation effect has
  been observed.
• Ecm350GeV jet energy resolution decrease by
  segmentation.
• Realistic PFA performance at high energy region
  is still low jet resolution, should be improved.
• 91GeV is used for PFA optimization for now.

Hiroaki Onos talk
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Optimization using PFA
Jet energy resolution is studied by using Z?qq
events. ILC goal of 30/vE has been achieved in
the barrel region of the Z-pole events. PFA
performance with various GLD configuration has
been studied. ? High B-field/Large Calorimeter
gives better performance as expected. ?
PFA performance of Pb calorimeter is comparable
to that of default configuration.
Tamaki Yoshiokas talk
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Optimization from isolated ?

• Motivated by GMSB
• Angular Resolution Study
• Position Resolution of ECAL cluster
• Direction of Reconstructed gamma
• Calorimeter Component Dependence
• Cell size Dependence
• Material Dependence

Hitoshi Hanos talk
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Resolution of isolated ?
1 GeV 2 GeV 5 GeV 10 GeV
? (mrad)
? (mrad)
cos?
cos?
? (mrad)
? (mrad)
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Results of the isolated ? study

• Angular resolution of default-GLD Calorimeter
  (W1cm)
• The angular resolution is estimated to be
  125mrad/v(E/GeV)
• Dependence on cell size granularity and material
  dependence (W, Pb) has been studied
• No significant difference has been observed
  between 1cm and 0.5cm
• Lead is better than Tungsten for isolated gamma
• Energy resolution is same

Hitoshi Hanos talk
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Pion-zero resolution
Daniel Jeans talk
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Results of Pion-zero Study
Daniel Jeans talk
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LDC HCAL Optimization
Ties Behnkes talk
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ILC Software Test in CALICE
Roman Pöschls talk
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Time is short for preparation