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Track Extrapolation/Shower Reconstruction in a Digital HCAL

Track Extrapolation/Shower Reconstruction in a Digital HCAL. Steve Magill ANL. E-flow alg. Korea, NIU, Prague. 1 st step - Track extrapolation thru Cal – substitute for Cal cells in road (core + tuned outlyers) - analog* or digital techniques in HCAL – S. Magill

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Track Extrapolation/Shower Reconstruction in a Digital HCAL

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  1. Track Extrapolation/Shower Reconstruction in a Digital HCAL Steve Magill ANL E-flow alg. Korea, NIU, Prague • 1st step -Track extrapolation thru Cal • – substitute for Cal cells in road (core + tuned outlyers) • - analog* or digital techniques in HCAL– S. Magill • – Cal granularity/segmentation optimized for separation of charged/neutral clusters • 2nd step -Photon finder (use analytic long./trans. energy • profiles,ECAL shower max,etc.)– S. Kuhlmann • 3rd step -Jet Algorithm ontracks and photons- Done • 4th step –include remaining Cal cells (neutral hadron • energy) in jet (cone?)-> Digital HCAL? * V. Morgunov, CALOR2002

  2. Density-Weighted CAL Cells E-weight : analog cal D-weight : digital cal area ~ 40 cells  red – E fraction for density > 1/40 blue – E fraction outside .04 cone    cell density weight = 3/40 # cells in window

  3. ECAL Interaction Layer 20, Theta, Phi

  4. HCAL Interaction Layer 10, Theta, Phi

  5. Density vs E - ECAL MIP signal – 8 MeV cell energy (GeV) cell density

  6. Density vs E - HCAL what’s this? MIP signal – 36 MeV cell energy (GeV) cell density

  7. Mokka, impact of the gas in HCAL Electrons Pions Gas Scin Gas Scin

  8. HCAL E fraction, Ecell > 1 MIP

  9. HCAL Cell Density Distribution 31% single cell windows mean ~ 4 cells

  10. Seed Cell Distribution (cell density > 1)

  11. Track Extrapolation/Shower Link Algorithm • 1. Pick up all seed cells close to extrapolated track • - Can tune for optimal seed cell definition • - For cone size < 0.1 (~6o), get 85% of energy • 2. Add cells in a cone around each seed cell • through n layers • 3. Linked seed cells in subsequent cones form • the reconstructed shower • 4. Discard all cells linked to the track

  12. Single 10 GeV Pion : D-weighted event display Gap between ECAL/HCAL Blue – all Red – density > 1 Green – density > 3

  13. Single 10 GeV Pion – event display comparison

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