Research algorithm of overlapping clusters in PrimEx By Victor Tarasov

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

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

The dependence between GEANT energy and energy in HyCal (for 0. 5, 1 The dependence between GEANT energy and energy in HyCal (for 0.5, 1.0, 1.5, 2.0 GeV)

Simulation of 2 gammas with energies 1 and 10 GeV; 3 and 8 GeV X1 = 5, Y1 = 15 X2 = -5, Y2 = 15 in both cases Reconstruct position (X and Y) have a values with good agreement relatively GEANT values in error limits

Energy calibration in PrimEx

Check position and energy for 1 gamma in GEANT energy range 0 Check position and energy for 1 gamma in GEANT energy range 0.5 - 8 GeV GEANT X=11 Y=15 in all cases

Table with values for 1 gamma simulation

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

Double check for 2 gammas GEANT E1 = E2 = 5.5 , X1 = -5, X2 = 5, Y1=Y2=15, HyCal E = 5.56±0.08, X1 = -4.96±0.16, X2 = 4.97±0.16, Y =14.98±0.12,

Overlapping clusters Simulation 2 gammas with fixed Energy (1 and 4 GeV) and different distance between them: 2,3,4,5 and 6 cm

Dependence between probability to separate 2 clusters and distance between them |Egeant/Ehycal -1| < 2·σ, where σ is energy resolution in researching diapason of energy

Conclusion Connection with PrimEx experiment a) Examination with PrimEx setup b) Examination with PrimEx program software, look how GEANT and prim_ana (main program for analyzing in this experiment) works Look for mechanism of reconstruction coordinate and energy Research mechanism of overlapping clusters