Research algorithm of overlapping clusters in PrimEx

By Victor Tarasov

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Main purpose

To look how works • 1) mechanism of clusterization in PrimEx• 2) algorithm of overlapping clusters in PrimEx

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Simulation 1 gamma with Energy 2 GeV, X=11 cm, Y=15 cm

E= 1.99±0.04X= 10.98±0.18Y=14.99±0.16

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The dependence between GEANT energy and energy in HyCal (for 0.5, 1.0, 1.5, 2.0 GeV)

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Simulation of 2 gammas with energies 1 and 10 GeV; 3 and 8 GeV

Reconstruct position (X and Y) have a values with good agreement

relatively GEANT values in error limits

X1 = 5, Y1 = 15X2 = -5, Y2 = 15

in both cases

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Energy calibration in PrimEx

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Check position and energy for 1 gamma in GEANT energy range 0.5 - 8 GeV

GEANTX=11Y=15

in all cases

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Table with values for 1 gamma simulation

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Extreme position

GEANT HyCal E = 2 GeV, E =(1.99±0.04) GeV X = 32cm , X=(32.01±0,22) cmY = 32cm, Y=(32,04±0,24) cm

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Double check for 2 gammas

GEANTE1 = E2 = 5.5 , X1 = -5, X2 = 5, Y1=Y2=15,

HyCalE = 5.56±0.08,

X1 = -4.96±0.16,X2 = 4.97±0.16,Y =14.98±0.12,

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Overlapping clusters

Simulation 2 gammas with fixed Energy (1

and 4 GeV) and different distance between them:

2,3,4,5 and 6 cm

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|Egeant/Ehycal -1| < 2·σ,

where σ is energy resolution in researching

diapason of energy

Dependence between probability to separate 2 clusters and distance between them

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Conclusion

1. Connection with PrimEx experimenta) Examination with PrimEx setup

b) Examination with PrimEx program software, look how GEANT and prim_ana (main program for analyzing in this

experiment) works2. Look for mechanism of reconstruction coordinate and energy

3. Research mechanism of overlapping clusters