Particle Flow Calorimetry and ILC Detector Design - Center for High ...

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In a typical jet : 60 % of jet energy in charged hadrons 30 % in photons (mainly from ) 10 % in neutral hadrons (mainly and ) Traditional calorimetric approach: Measure all components of jet energy in ECAL/HCAL ! ~70 % of energy measured in HCAL: Intrinsically “poor” HCAL resolution limits jet energy resolutionπ + The Particle Flow ParadigmγnE JET = E ECAL + E HCALE JET = E TRACK + E γ + E n Particle Flow Calorimetry paradigm: charged particles measured in tracker (essentially perfectly) Photons in ECAL: Neutral hadrons (ONLY) in HCAL Only 10 % of jet energy from HCAL much improved resolutionCCAST-Tsinghua School, 26/4/2009 Mark Thomson 7
CCAST-Tsinghua School, 26/4/2009 Mark Thomson 8Particle Flow CalorimetryHardware:Need to be able to resolve energy deposits from different particlesHighly granular detectors (as studied in CALICE)Software:Need to be able to identify energy deposits from each individual particle !Sophisticated reconstruction softwareParticle Flow Calorimetry = HARDWARE + SOFTWARE
Page 5 and 6: CCAST-Tsinghua School, 26/4/2009 Ma
Page 7: CCAST-Tsinghua School, 26/4/2009 Ma
Page 15: ILD Software Framework (C++) Everyt
Page 18 and 19: PandoraPFANeed “realistic” Part
Page 26 and 27: Example : MIP segmentsCCAST-Tsinghu
Page 32 and 33: vi) Photon ID/Recovery Use simple c
Page 36 and 37: Putting it all together…CCAST-Tsi
Page 42 and 43: Understanding PFA PerformanceCCAST-
Page 46 and 47: HCAL Depth ResultsCCAST-Tsinghua Sc
Page 48 and 49: Cost drivers:e.g. Radius vs. B-fiel
Page 52 and 53: Particle Flow can deliver ILC jet e
Page 54 and 55: General ConsiderationsCCAST-Tsinghu
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CCAST-Tsinghua School, 26/4/2009 Ma
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Thank youCCAST-Tsinghua School, 26/
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