2010.04.09 BFC and Pythia QA: 10% gain shift

See this post from Alice for QCD sample rates

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 2.6 mClusterThreshold 3.6 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 = 3.4 GeV
StChain:INFO - Init() : Cluster eT threshold = 4.5 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	0.00646	0.09532	0.00656
pt=3-4	0.03042	0.2401	0.02772
pt=4-6	0.09438	0.42552	0.07568
pt=6-9	0.165984	0.54004	0.149137
pt=9-15	0.167329	0.559137	0.162972
pt=15-25	0.12486	0.45662	0.11744
pt=25-35	0.0562525	0.269499	0.0536273

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	6e-05	0	0
pt=3-4	0.00016	6e-05	0
pt=4-6	0.0003	8e-05	0
pt=6-9	0.000261044	6.0241e-05	0
pt=9-15	0.000220884	6.0241e-05	0
pt=15-25	0.00028	0.00012	0
pt=25-35	0.000280561	0.000140281	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	0.0677717	1	0.0612673
pt=3-4	0.126697	1	0.105623
pt=4-6	0.221799	1	0.16991
pt=6-9	0.307318	1	0.26809
pt=9-15	0.299264	1	0.281882
pt=15-25	0.273444	1	0.244317
pt=25-35	0.20873	1	0.181217

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	0.000629459	0	0
pt=3-4	0.000416493	0	0
pt=4-6	0.000517014	0	0
pt=6-9	0.00037183	0	0
pt=9-15	0.000287305	0	0
pt=15-25	0.000350401	0	0
pt=25-35	0.000520524	0	0