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Energy Flow Studies Steve Kuhlmann Argonne National Laboratory for Steve Magill, Brian Musgrave, Norman Graf, U.S. LC Calorimeter Group
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Introduction/Outline Detector is described in Dhiman’s (1st) talk (Si-W EM Cal, 5 mm X 5mm, R=127 cm, 17%/ E) Software is the same as Dhiman’s (2nd) talk Conversion to Geant4 soon Real Track Pattern Recognition Included Will Discuss: General Energy Flow Issues Track Depositions in EM Calorimeter and Simple Photon Finder
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Physics Motivation I: Higgs Self-Coupling with no beam constraint Physics Motivation II: Electroweak symmetry breaking without an elementary Higgs (also no beam constraint) Question: Any More?
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Question from Jeju and Calor2000: Will Hadronization or Jet Clustering Ruin Resolutions? No, at least if backgrounds are small
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Particle Content of Hadronic Z Decays at s = 91 GeV
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Particle Energies in Hadronic Z Decays at s = 91 GeV Charged, Mean E=2.85 Photons, Mean E=1.0 Neutrons/K0L, Mean E=4.35
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Resolution components of Hadronic Z Decays at s = 91 GeV Assuming Perfect Identification in this Detector Configuration Neutrons+Klong 2.9 GeV Photons 1.4 GeV Tracks 0.25 GeV Put together in Tesla TDR in Energy Flow algorithm
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Effect of Neutrinos in Hadronic Z Decays
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Tracking cannot be assumed to be perfect, forward tracking and “curlers” are issues Effect of ignoring charged particles below certain thresholds Tesla TDR, is fine if achieved
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Track Reconstruction Efficient Down to Pt=0.5 GeV in Barrel Region
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Single 10 GeV -
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Effect of possible Photon or Neutron/K0Long thresholds Sum of all energy except photons < 0.2 GeV Sum of all energy except neutrons/K0L < 0.5 GeV
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Determining Charged Particle Depositions Energy deposited in last EM layer (within 0.6 0 of track) Easy to recognize MIP Easy to recognize MIP Easy to determine 1 st layer of pion shower Easy to determine 1 st layer of pion shower Interactions Single 2 GeV - Single 2 GeV Muon Tail OverflowsZeros
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Determining Charged Particle Depositions Single 2 GeV - Next step in “Track-seeded” Energy Flow is to remove all hits in each layer based on something like red histogram, then cluster photons and neutrons/K0L. Energy weighted
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Hadronic Z Decay
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Hadronic Z Decays at s = 91 GeV Simple photon finder: Remove EM Clusters within 0.03 of Track, unless track was MIP in all 30 layers. Then remove if within 0.01.
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Single 10 GeV -
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Separate photons from neutrons/K0L with 3-layer shower max energy > 30 MeV 2 GeV Electron 2 GeV - ddd MeV
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Hadronic Z Decays at s = 91 GeV
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Width=3 GeV, Goal is 1.4 GeV Hadronic Z Decays at s = 91 GeV
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Questions for the Future Other Physics Analyses that Need 30%/ E Jet Resolution? How much better is a large detector? Digital or Analog Hadron Calorimeter? Optimized segmentation for physics/costs?
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Determining Charged Particle Depositions Single - Next step in “Track-seeded” Energy Flow is to remove all hits in each layer based on something like red histogram, then cluster photons and neutrons/K0L. Energy weighted
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Determining Charged Particle Depositions Interaction Layer 0 Abs(Delta-Theta) Interaction Layer 26 Abs(Delta-Theta) Interaction Layer 17 Abs(Delta-Theta) Interaction Layer 8 Abs(Delta-Theta)
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Determining Charged Particle Depositions
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