Foward Ecal Reco

• Updated fEcal in DD4Hep
• Code is at EICrecon GitHub FEMCupdate20250501 branch
• Updated "FEMC" in EICRecon
  • Added switch between Homogeneous and ScFi geometry
  • Homogeneous : 11.333/sqrt(E) + 3% energy smearing
  • Homogeneous : Sampling Fraction = 100%
  • ScFi : Summing all fiber hits to a tower
  • ScFi : No energy smearing
  • ScFi : Sampling Fraction = 3%
• Added SiPM Saturation in calorimeter DIGI code
  • src/algorithms/calorimetry/CalorimeterHitDigi.cc
    • 2 new parameters totalPixel(default=0) and nPhotonPerGeV
    • By default (totalPixel=0) no attenuation will be applied
  • src/detectors/FEMC/FEMC.cc
    • nPhotonPerGeV = 1500
    • totalPixel = 4*159565
    • default for FEMC is saturation ON for both Homogeneous and ScFi
    • Use "-PFEMC:SiPMSaturation=OFF" option when running eicrecon to turn this off
• There are 9 kinds of clusters exist in EICrecon/FEMC
  • IslandProto, CoG, SplitAndMerge
  • Truth (using MC info?) and not-Truth for each algo
  • Shape analysis added
  • It seems like CoG(Center of Gravity) is only one working as is among not-Truth one
• Throwing 1 to 80GeV Gamma
  • Hit and cluster distribution for 2GeV
    
  • CoG cluster energy for single 1~80GeV gamma events
    

    Homogeneous	Homogeneous	ScFi SF=3%	ScFi SF=2.9%
    Smearing On	Smeasring On	Smeasring Off	2.2% Smeasring
    SiPM Saturation OFF	SiPM Saturation ON	SiPM Saturation ON	SiPM Saturation ON
    ADC Threshold=2	ADC Threshold=2	ADC Threshold=2	ADC Threshold=3

  • Energy linearity and resolution
    
• Event Display with CoG cluster
  • Filled color represents energy of the tower.
  • Colored boundary lines shows the tower belongs to a cluster with the same boundary colored towers.

    particle	20GeV	2GeV	2GeV with EMaxCluser/Einput < 0.6
    gamma	Homogeneous, Scfi	Homogeneous, Scfi	Homogeneous, Scfi
    mu-	Homogeneous, Scfi
    pi-	Homogeneous, Scfi
    pi0	Homogeneous, Scfi