2010.05.03 Pythia/BFC gamma-filter accaptance vs. gamma candidate pt (after gamma-maker 3x3 cluser fix)

Related inks:

• BFC and Pythia filter biases vs. partonic pt
• 3x3 clusering and gamma maker fix
• Alice' study with QCD sample
• QCD and gamma-jet data samples are described here
  (filter parameters are listed below)

Number of generated events per partnic pt bin:
gamma-jet: 25K
QCD(2-4): 50K
QCD(4-55): 25K

Pythia filter configuration

StEemcGammaFilter:: running the TEST mode (accepting all events). Set mFilterMode=1 to actually reject events
StEemcGammaFilter:: mConeRadius 0.22 mSeedThreshold 3.8 mClusterThreshold 5 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 = 3.8 GeV
StChain:INFO - Init() : Cluster eT threshold = 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 configuration

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

GammaMaker configuration

runSimuGammaTreeMaker():: GammaMaker config: ConeRadius 0.7 ClusterEtThreshold 5.5 SeedEnergyThreshold 4.2 ClusterEnergyThreshold 5.5 BsmdRange 0.05237 EsmdR ange 20

A2Emaker configuration

StEEmcA2EMaker *EEanalysis = new StEEmcA2EMaker("mEEanalysis");
EEanalysis->threshold(3.0, 0); // tower threshold (ped+N sigma)
EEanalysis->threshold(3.0, 1); // pre1 threshold
EEanalysis->threshold(3.0, 2); // pre2 threshold
EEanalysis->threshold(3.0, 3); // post threshold
EEanalysis->threshold(3.0, 4); // smdu threshold
EEanalysis->threshold(3.0, 5); // smdv threshold

Trigger configuration

emulate L2E-gamma trigger for Run 2006 [eemc-http-mb-l2gamma:: id 137641]
Trigger conditions:
cluster Et (2x2) = 5.2GeV
seed Et = 3.7GeV

Accept/Reject relative to the total number of offline selected events

Definition: offline selected events are events which satisfy to the following conditions:

• Online condition (L2E-gamma trigger fired)
• Reconstructed vetrex (|v_z|<120cm)
• Offline condition (at least one gammaMaker candidate found)

Figure 1a:
(upper plots) Gamma candidate yields vs. candidate pt (all partonic pt bins, no pt weights)
(lower plots) False rejection: histograms in the upper panel scaled by L2E-gamma-trigger yield (blue histogram)

Figure 1b: Same ad Fig. 1a with zoom into low pt region

Yields for each of partonic pt bins separately

Figure 2: Same ad Fig. 1b for partonic pt=2-3

Figure 3: Same ad Fig. 1b for partonic pt=3-4

Figure 4: Same ad Fig. 1b for partonic pt=4-6

Figure 5: Same ad Fig. 1b for partonic pt=6-9

Figure 6: Same ad Fig. 1b for partonic pt=9-15

Figure 7: Same ad Fig. 1b for partonic pt=15-25

Figure 8: Same ad Fig. 1b for partonic pt=25-55