2010.04.17 BFC and Pythia QA: 10% gain shift: lowered thresholds

See this post from Alice for QCD sample rates with slightly lower thresholds

QCD and gamma-jet data samples are described here (filter parameters are listed below)

Pythia filter configuration

StEemcGammaFilter:: running the TEST mode (accepting all events). Set mFilterMode=1 to actually reject events
StEemcGammaFilter:: mConeRadius 0.22 mSeedThreshold 2.4 mClusterThreshold 3.3 mEtaLow 0.95 mEtaHigh 2.1 mMaxVertex 120
StEemcGammaFilter:: mCalDepth 279.5 mMinPartEnergy 1e-05 mHadronScale 1 mFilterMode 0 mPrintLevel 1

BFC filter configuration

StChain:INFO - Init() : Using gamma filter on the EEMC
StChain:INFO - Init() : EEMC Sampling Fraction = 0.05
StChain:INFO - Init() : Seed energy threshold = 2.8 GeV
StChain:INFO - Init() : Cluster eT threshold = 3.8 GeV
StChain:INFO - Init() : Maximum vertex = +/- 120 cm
StChain:INFO - Init() : Running the TEST mode (accepting all events). Set mFilterMode=1 to actually reject events in BFC

StEEmcSlowMaker

BFC:INFO - setTowerGainSpread(): gain spread: 0; gain mean value: 1.1

Accept/Reject relative to the total number of Pythia generated events

Figure 1: Fraction of accepted events

Accept rate: fract. of generated events
GammaJet
pt bin Bfc Filter Pythia Filter L2gamma Trigger
pt=2-3 0.01732 0.1343 0.00628
pt=3-4 0.05818 0.3001 0.0261
pt=4-6 0.1317 0.46492 0.07864
pt=6-9 0.17804 0.56314 0.15092
pt=9-15 0.17226 0.57516 0.15964
pt=15-25 0.13356 0.46894 0.1179
pt=25-35 0.062 0.28546 0.05482

Figure 2: False rejection (Y-axis scale is 10^-3)

False reject: fract. of generated events
GammaJet
pt bin Bfc Filter Pythia Filter L2gamma Trigger
pt=2-3 2e-05 2e-05 0
pt=3-4 6e-05 6e-05 0
pt=4-6 6e-05 4e-05 0
pt=6-9 0.0001 6e-05 0
pt=9-15 2e-05 2e-05 0
pt=15-25 2e-05 0 0
pt=25-35 2e-05 2e-05 0

Accept/Reject relative to the number of Pythia filter accepted events

Figure 3: Fraction of accepted events relative to Pythia filter accepted events

Accept rate: fract. of Pythia-filtered events
GammaJet
pt bin Bfc Filter Pythia Filter L2gamma Trigger
pt=2-3 0.128816 1 0.0415488
pt=3-4 0.193735 1 0.0808397
pt=4-6 0.283232 1 0.161877
pt=6-9 0.316049 1 0.260291
pt=9-15 0.29943 1 0.26876
pt=15-25 0.284813 1 0.240415
pt=25-35 0.217053 1 0.175156

Figure 4: False rejection relative to Pythia filter accepted events

False reject: fract. of Pythia-filtered events
GammaJet
pt bin Bfc Filter Pythia Filter L2gamma Trigger
pt=2-3 0 0 0
pt=3-4 0 0 0
pt=4-6 4.30182e-05 0 0
pt=6-9 7.10303e-05 0 0
pt=9-15 0 0 0
pt=15-25 4.26494e-05 0 0
pt=25-35 0 0 0
Groups: