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

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CCAST-Tsinghua School, 26/4/2009 Mark Thomson 29 If track momentum and cluster energy inconsistent : RECLUSTERe.g.18 GeV30 GeV12 GeV10 GeV TrackChange clustering parameters until cluster splitsand get sensible track-cluster matchNOTE: NOT FULL PFA as clustering driven by track momentumThis is very important for higher energy jets
CCAST-Tsinghua School, 26/4/2009 Mark Thomson 30 Cluster splittingIterative Reclustering StrategiesReapply entire clustering algorithmto hits in “dubious” cluster. Iterativelyreduce cone angle until cluster splitsto give acceptable energy match to track + plug in alternative clustering algorithms Cluster merging with splittingLook for clusters to add to a track toget sensible energy association. Ifnecessary iteratively split up clustersto get good match. Track association ambiguitiesIn dense environment may have multipletracks matched to same cluster. Applyabove techniques to get ok energy match.30 GeV38 GeV10 GeV Track30 GeV Track18 GeV12 GeV18 GeV12 GeV 32 GeV “Nuclear Option” If none of above works – kill track and rely on clusters alone
Page 5 and 6: 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
Page 60: Thank youCCAST-Tsinghua School, 26/

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