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ECAL EM-shower

ECAL EM-shower. (s)tau. 10GeVphoton &20GeV pion. 7mm apart. Tohru Takeshita 23/Jan/2007> 30/Jan/2007 K+J meeting. Look into EM showers. EM shower event. R(Moliere)=14mm. X0=5mm. With 1cm x 1cm real segmentatiom detector (W 3mm + scinti. 2mm ) * 100 layers 100 x 100 x 100 cells. t. t.

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ECAL EM-shower

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  1. ECAL EM-shower (s)tau 10GeVphoton &20GeV pion 7mm apart • Tohru Takeshita • 23/Jan/2007> 30/Jan/2007 K+J meeting Look into EM showers

  2. EM shower event R(Moliere)=14mm X0=5mm • With 1cm x 1cm real segmentatiom • detector • (W 3mm + scinti. 2mm ) * 100 layers • 100 x 100 x 100 cells t t y 100cell z x 100layer 100cell Tungsten+Scintillator sandwich

  3. gamma 10GeV event X-proj. Y-proj. Y X y 50 0 z Z-proj. dE dist. 50 x

  4. gamma 10GeV event cont. dE-Zsum(MeV) Nhit-cell Y Y X X

  5. gamma 10GeV event cont. 5mm dE-Zsum(MeV) dE-Zsum(MeV) Y Y X X

  6. gamma 10GeV event cont. 5mm 5mm dE-Zsum(MeV) dE-Zsum(MeV) Y Y X X

  7. gamma 10GeV event cont. 5mm 5mm 5mm Nhit-cell Nhit-cell Nhit-cell Y Y Y X X X

  8. gamma 10GeV event cont. 5mm 5mm 5mm Nhit-cell Nhit-cell Nhit-cell Z Z Z X X Y

  9. xgam1-xgam2 neutral pion reconstruction by ECAL pi-zero decays into two photons xgam1-xgam2 GLD 50GeV GLD 20 10 4GeV SiD xgam1-xgam2 Epizero (GeV)

  10. neutral pion reconstruction by ECAL 20GeV 20GeV dE-Zsum(MeV) Nhit-cell

  11. neutral pion reconstruction by ECAL Nhit-cell • 20GeV dE-Zsum(MeV) Nhit-cell Y X Nhit-cell Z Z Y X Y X 2 20GeV pizero must be reconstructed by 1cm ECAL

  12. neutral pion reconstruction by ECAL Nhit-cell • 50GeV dE-Zsum(MeV) Nhit-cell Y X Y Z Z X Y X 50GeV pizero reconstruction looks difficult

  13. Summary • Photon shower events were looked into by ECAL of 1 cm x 1cm segmentaion • Hit information will give power to reconstruct neutral pions • need calm sensors • Awaiting for some one who look into it • Hadron interaction will be also tested

  14. Hadron Shower sim. • model dep. LHEP QGPC R(90%) cm

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