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EVENT 168

π 0  γ e + e – (1.2%) removed. EVENT 168. Example of a ~symmetric decay. Evt# 81 Gamma1: ThetaBin=420 PhiBin=213 Reco Energy = 4.87 MC Energy = 5.28 Gamma2: ThetaBin=417 PhiBin=204 Reco Energy = 4.39 MC Energy = 4.72. Event 81. Neighborhood Grads.

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EVENT 168

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  1. π0γ e+ e– (1.2%) removed EVENT 168

  2. Example of a ~symmetric decay Evt# 81 Gamma1: ThetaBin=420 PhiBin=213 Reco Energy = 4.87 MC Energy = 5.28 Gamma2: ThetaBin=417 PhiBin=204 Reco Energy = 4.39 MC Energy = 4.72 Event 81 Neighborhood Grads

  3. γ1 “looks at” γ2 layers used: 0--9 distance, in number of cells γ2 “looks at” γ1 layers used: 0--9 distance, in number of cells Event 81

  4. Example of an asymmetric decay Evt# 36 Rmin1 = 4 , Rmax1 = 9 Rmin2 = 36, Rmax2 = 9 , DeltaR = 10 Gamma1: ThetaBin=420 PhiBin=288 Box-Reco Energy=8.09 ( MC = 8.88 ) Gamma2: ThetaBin=410 PhiBin=289 Box-Reco Energy=1.33 ( MC = 1.12 ) Event 36 Neighborhood Grads

  5. γ1 “looks at” γ2 layers used: 0--9 distance, in number of cells γ2 “looks at” γ1 layers used: 0--9 distance, in number of cells Event 36

  6. Evt# 48 (how it can get tricky...) Gamma1 Energy=8.10 MC = 9.50 Gamma2 Energy=0.31 MC = 0.50 “dirt” γ2 γ1 Event 48 Neighborhood Grads

  7. Note: “Grads” search was cylindrical (as opposed to directional, in theta and phi) γ1 “looks at” γ2 layers used: 0--9 γ1 γ2 “dirt” distance, in number of cells γ2 “looks at” γ1 layers used: 0--9 γ1 γ2 “dirt” distance, in number of cells Event 48

  8. Evt# 184 ( A case of extreme asymmetry ) Gamma1: ThetaBin=419 PhiBin=1603 Reco Energy=9.45 MC Energy = 9.98 Gamma2: ThetaBin=414 PhiBin=1588 Reco Energy=0.050 MC Energy=0.021 Event 184 Neighborhood Grads

  9. layers 10—19 Rmin1 = 10 , Rmax1 = 13 hsize1 = 13 , DeltaR = 15 layers 0—9 cannot detect gamma_2 γ2 (*) layers 0—9 layers 20—29 γ1 γ2 Event 184 (*) clearly, any level of noise here turns this into an inefficiency...

  10. Evt# 284 (Gamma_2 is a late shower) Gamma1: ThetaBin=419 PhiBin=1492 Reco Energy=7.91 MC Energy=8.04 Gamma2: ThetaBin=417 PhiBin=1483 Reco Energy=2.15 MC Energy=1.96 Event 284 Neighborhood Grads

  11. layers 10—19 γ1 γ1 γ2 Rmin1 = 4 Rmax1 = 7 hsize1 = 5 layers 0—9 cannot detect gamma_2 γ2 γ1 layers 0—9 Rmin2 = 4 Rmax2 = 8 DeltaR = 9 γ1 layers 20—29 γ2 Event 284

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