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EVENT 168 PowerPoint PPT Presentation


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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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Event 168

π0γ e+ e–

(1.2%) removed

EVENT 168


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


Event 168

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


Event 168

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


Event 168

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


Event 168

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


Event 168

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


Event 168

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


Event 168

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...


Event 168

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


Event 168

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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