DD4hep-based CLIC Detector Calorimeter Calibration

Introduction

This is a draft of new Twiki page on Pandora calorimeter calibration for CLIC and FCC-ee (CLD model) detectors. With time it will replace DD4hepClicDetectorCaloCalibration page.

Pandora calorimeter calibration procedure

To calibrate DD4hep-based detector one have to perform following steps shown in the picture below.

calibration_steps.png

Step 1. Calibration with simplified photon reconstruction

Actions during the calibration:

  1. ECAL raw energy calibration. Single photon sample is used.
  2. HCAL raw energy calibration. Single K0L sample is used.
  3. HCAL ring calibration. Single muon sample is used (???).
  4. Minimum ionizing particle calibration. Single muon sample is used.
  5. Pandora EM cluster calibration. Single photon sample is used.
  6. Pandora Had cluster calibration. Single K0L sample is used.

Summary table of the calibration constants obtained during calibration (constants names corresponds to ones used in xml configuration file for Marlin reconstruction):

Calibration Constant name Description
CalibrECAL Energy scale factor applied to each ECAL hit
ECALEndcapCorrectionFactor Correction factor applied to ECAL Endcap hits
CalibrHCALBarrel Energy scale factor applied to each HCAL Barrel hit
CalibrHCALEndcap Energy scale factor applied to each HCAL Endcap hit
CalibrHCALOther Energy scale factor applied to each hit in HCAL Other (e.g. HCAL ring)
ECalToMipCalibration Energy scale factor applied to each hit in ECAL which is associated wtih muon cluster
HCalToMipCalibration Energy scale factor applied to each hit in HCAL which is associated wtih muon cluster
MuonToMipCalibration Energy scale factor applied to each hit in the Muon system
ECalToEMGeVCalibration  
HCalToEMGeVCalibration  
ECalToHadGeVCalibrationBarrel  
ECalToHadGeVCalibrationEndCap  
HCalToHadGeVCalibration  
Detailed description of the calibration procedure can be found in the attached pdf-document (version by 12 Sep 2017) or in the latest TeX-version

Step 2. Photon likelihood training

Step 3. Calibration with full photon reconstruction

At this step we turn on full photon cluster reconstruction and we use photon likelihood obtained in Step 2. Then we perform calibration identical to one described in Step 1.

Step 4. Software compensation training

Effect of using different input samples has been studied by M. Weber. Results can be found in this presentation.

Instructions to perform calorimeter calibration with iLCDirac calibration system

TODO

-- OleksandrViazlo - 2019-01-28

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