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L3 Filtering:

L3 Filtering:. - short- and medium term plans - how you can help out All-D  Meeting: 14 th March 2003 Terry Wyatt (FNAL-CD/Manchester) on behalf of the L3 Algorithms group. Functions of L3 filter system. Partial event reconstruction Select which events to be recorded

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L3 Filtering:

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  1. L3 Filtering: - short- and medium term plans - how you can help out All-D Meeting: 14th March 2003 Terry Wyatt (FNAL-CD/Manchester) on behalf of the L3 Algorithms group.

  2. Functions of L3 filter system • Partial event reconstruction • Select which events to be recorded • Define streams • Monitoring For each L1/L2 trigger that fires: • One or more L3scripts run • Each script calls thefilters/toolsnecessary for the trigger decision • performed by ScriptRunner • controlled by the trigger list trigger database

  3. Design rates:@Lumi ~2x1032 L1 L2 L3 tape 5-10kHz 1kHz 50Hz L1 L2 L3 tape 1.1kHz 600Hz 50Hz Time budget for L3 filtering  0.2 s per event Current rates:@Lumi ~2x1031

  4. Currently running online (global_CMT-10.35) cal unpack cal.cluster electron tau jet acoplanarity Ht missing Et smt unpack global tracker primary vertex (z) cft unpack muon unpack local muon track-matched muon (+ geometry tool)

  5. Other infrastructure • L3 streaming infrastructure essentially ready • L3 filter statistics for each trigger available to shift crew via daq_monitor • L3 trigger examine • runs on rootuple produced by l3fanalyze • L3 physics_results stored on TMB • YOUR physics analysis can become part of routine monitoring of L3!

  6. Using primary vertex z to improve jet Et resolution (Andy Haas)

  7. significantly sharper turn on curve with L3 primary vertex

  8. New Features for p15 • gcc compiler • primary vertex filter (z) • 3D primary vertex finder • input run-by-run beam spot • pt-dependent track dca errors • tools to produce L3 physics_results (start to decouple TMB analysis from L3 algorithm code) needed for impact parameter-based b-tag

  9. Primary vertex filter (Andy Haas) • L3 primary vertexing in z • 98 % efficient (relative to offline) • Agrees with the offline best vertex • Sigma is 0.36 cm in z • Can filter on: • z of the primary vertex • number of tracks in the primary vertex

  10. Possible use • select events within SMT acceptance jet data bbH MC 25% of events have |Z| > 35cm ~1% of eventswith >=3 b-tagshave |Z| > 35cm

  11. 3D primary vertex finder (Chris Barnes) • Select tracks consistent with: • primary vertex in z • run-by-run beam spot in xy • Remove tracks with large 

  12. Run-by-run beam spot vertex_examine BeamSpotMonitor ACNET COOR L3 Supervisor ScriptRunner L3 Tools Michiel Sanders Scott Snyder Gordon Watts Jon Hays L2STT Runs DB same mechanism can be used for other L3 logging/configuration tasks

  13. Beam spot drift from vertex_examine • stable over long periods of time • position/tilt from previous run/store would usually be good enough • precise running strategy still to be worked out 50 m x y (Michiel Sanders)

  14. Impact parameter based b-tag (Per Jonsson)

  15. p15 status • Aim to get p15 online within about a month of p15 cut • A lot of preparatory work done in test release (Angela Bellavance) • gcc required a large number of packages to be fixed • l3fanalyze rootuples produced with t03.07.00 trigsim for data taken online with p13 and global_CMT-10(Angela Bellavance, Han Do) • performance tests of global_CMT-10 tools underway • commissioning the p15 new features may take a little longer

  16. Aims for p16 (June 2003) • CPS (Yi Jiang, Andre Turcot) • Improve tracking efficiency/resolution (Arizona/I.C.) • Extend tracking beyond   1.5 (Arizona) • Muons: (Martin Wegner) • track + calorimeter muon id. • di-muon filters • Refined treatment of electron shower shape (Ulla Blumenschein) • FPD (Tamsin Edwards) • FPS ?

  17. Other activities • Code management (Angela Bellavance, Jon Hays) • On-/Off-line comparator (Han Do) • L3 section of MC trigger list (Terry Toole, Terry Wyatt) • Identification of physics event types using L3 objects: • J/   (Ike Hall) • Z   (Emily Nurse, Terry Wyatt) • routine offline efficiency monitoring • online event flagging

  18. Extra help needed urgently! - E.g., Calorimeter tools `orphaned’ • electron, tau, jet, missing Et need study of: • primary vertex z to improve Et resolution • calorimeter non-linearity corrections • central track match • influence of L3nada • influence of coarse hadronic layer • other quality cuts? • software tools exist • need people willing to run Trigsim and look at the resulting rootuple! • recent volunteers: Cristina Galea, Luiz Mundim - E.g., matching L3 objects to MC/L1/L2/reco objects

  19. There are many open questions • How to handle redundancy in trigger, e.g., leptons • many L3 filter scripts • one L3 filter script (with details stored in L3 data) • Are 256 L3 triggers enough? • What else can we do in L3? • more sophisticated monitoring? • technical and/or physics measurements on rejected events? • define “not for reco” stream?

  20. To find out more: • L3 Algorithms web-pages: http://www-d0.fnal.gov/computing/algorithms/level3/home.html http://www-d0.fnal.gov/computing/algorithms/level3/status.html http://www-d0.fnal.gov/computing/algorithms/level3/projects.html • L3 Algorithms working group meetings take place every week: Wednesday 14:00-15:30 in the Farside • Talk to Dan Claes (dclaes@unlhep.unl.edu), Terry Wyatt (twyatt@fnal.gov) or Rick Jesik (jesik@fnal.gov) about the opportunities to get involved!

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