2010.02.12 Final Pythia and BFC EEMC-gamma-filter paramter settings

Pythia generated processes

Prompt photons (gamma-jets) 2->2 QCD
id Process id Process
14 f + fbar -> g + gamma 11 f + f' -> f + f' (QCD)
18 f + fbar -> gamma + gamma 12 f + fbar -> f' + fbar'
29 f + g -> f + gamma 13 f + fbar -> g + g
114 g + g -> gamma + gamma 28 f + g -> f + g
115 g + g -> g + gamma 53 g + g -> f + fbar
    68 g + g -> g + g

Number of generated events per parton pt bin

  Number of generated events
(100events/job)
Parton pt range (GeV) 2-3 3-4 4-6 6-9 9-15 15-25 25-35
gamma-jets 50K 50K 50K 50K 50K 50K 50K
2->2 QCD processes 100K 100K 50K 50K 50K 50K 50K

Pythia Filter configuration

StRoot/StMCFilter/StEemcGammaFilter.cxx
StRoot/StMCFilter/StEemcGammaFilter.h

Filter parameter Value Notes
mConeRadius 0.22  
mSeedThreshold 2.6 Cluster seed energy threshold (GeV)
mClusterThreshold 3.6 Cluster Et threshold (GeV)
mEtaLow 0.95 EEMC acceptance
mEtaHigh 2.1 EEMC acceptance
mMaxVertex 120.0 Vertex z cut (cm)
mCalDepth 279.5 EEMC SMD depth (cm)
mMinPartEnergy 1e-05 Ignore track with minim energy (GeV)
mHadronScale 0.4 Downscale factor for hadron energy
mFilterMode 0 / 1 0=Accept all events; 1=reject events

BFC Filter configuration

StRoot/StFilterMaker/StEemcGammaFilterMaker.cxx
StRoot/StFilterMaker/StEemcGammaFilterMaker.h

Filter parameter Value Notes
mSeedEnergyThreshold 3.4 Cluter seed energy threshold (GeV)
mClusterEtThreshold 4.5 Cluster Et threshold (GeV)
mEemcSamplingFraction 0.05 Assume 5% sampling fraction for EEMC
mMaxVertex 120.0 Vertex z cut (cm)
mFilterMode 0 / 1 0=Accept all events; 1=reject events

GammaMaker configuration

Filter parameter Value Notes
ConeRadius 0.7  
ClusterEtThreshold 5.5 (GeV)
SeedEnergyThreshold 4.2 (GeV)
ClusterEnergyThreshold 5.5 (GeV)

EEMC SlowSimulator configuration

(for a moment private version) of StEEmcSlowMaker.cxx
with modified setTowerGainSpread(Float_t s, Float_t mTowerGainMean)

Filter parameter Value Notes
mTowerGainMean 1.05 Overall +5% gain shift
GainSpread 0 No gain spread

GSTAR/Pythia options

  • detp geometry y2006h
  • Calorimeter cut for electromagnetic processes: emc_10keV
  • call pytune(100): PYTUNE v1.015; CDF Tune A
    or
    call pytune(320): PYTUNE Perugia; Perugia 0 tune