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Photon Energy Calibration and Position Determination in E/M Scale Using H's Vishnu V. Zutshi BNL

Explore the importance of absolute calibration, non-linearity correction, and optimal position measurement in EM scale using H's Vishnu V. Zutshi BNL methodology. Discover refinements in Monte Carlo schematics and effective clustering techniques.

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Photon Energy Calibration and Position Determination in E/M Scale Using H's Vishnu V. Zutshi BNL

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  1. EM scale using h’s Vishnu V. Zutshi BNL

  2. Preamble • gg decays • Important for absolute calibration • Non-linearity and offsets • Maybe possible with little or no trigger • Maybe possible with little or no tracking • Affords the possibility of refinement • Testing ground for Monte Carlo

  3. Schematic • 2 peaks and a valley • EM3 is your best chance here • Neighbourhood definition • You may or may not want to extend the EM3 clustering to other floors • CellNN does extend it to other floors

  4. CellNN • Each local maxima starts a floor cluster • An EM cell is defined to have 4 neighbours • Log weighting for position determination • Sharing based on a transverse parameterization of the shower • Angular matching between floor clusters • Position measurement is key

  5. Just maybe

  6. 5 GeV h’s Asym=abs(e1-e2)/(e1+e2)

  7. Single photons

  8. 5 GeV h’s uncorrected corrected

  9. 5 GeV h’s + E corr. + Asym. cut

  10. Lower Fcluster threshold 5 GeV h’s

  11. Lower Fcluster threshold 5 GeV h’s

  12. 1 GeV photon

  13. 2 GeV photons

  14. 10 GeV h’s Energy matching E/Egen

  15. 10 GeV h’s uncorrected corrected E/Egen

  16. 10 GeV h’s deltaR=sqrt(df2+dh2)

  17. 5 GeV h’s

  18. Lower Fcluster threshold 5 GeV h’s

  19. 10 GeV h’s

  20. 10 GeV h’s Position determined from ly3 if emfr>0.2

  21. 10 GeV h’s

  22. Single photons

  23. 10 GeV h’s Ly3frac>0.2 and new W0’s

  24. 10 GeV h’s

  25. 5 GeV h’s

  26. Ongoing… • W0’s for Fclustering • Energy corrections • Fthreshold • Neighbourhood • Sharing • Symmetric mass

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