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CalTask Force Workshop

CalTask Force Workshop. T42 algorithm dedicated webpage : http://www-d0.fnal.gov/~vlimant/noise-suppdescr/Description.html. VLIMANT Jean-Roch LPNHE 10 feb 2003. Principale Implementation Effect on data To come.

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CalTask Force Workshop

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  1. CalTask Force Workshop T42 algorithm dedicated webpage :http://www-d0.fnal.gov/~vlimant/noise-suppdescr/Description.html VLIMANT Jean-Roch LPNHE 10 feb 2003 • Principale • Implementation • Effect on data • To come

  2. T42Principale : reject isolated medium cellsNamed after an algorithm used in H1 • Select high signal cells (4 sigma) • Keep their significant neighbours (2 sigma) Thresholds to be tuned

  3. cal_t42 Packageusing same frame as cal_nada Classes : • Calt42 : container for cell lists • Calt42Chunk : container for Calt42 object • Calt42Reco : • does the cleaning and chunks managment. • Get the neighbourhood info from a Calt42Struct object which allows a linear algorithm complexity.

  4. Calt42Reco

  5. Calt42Reco

  6. Calt42StructClass content • Objects • spine : array[81600] of structured object • Mapped to ieta, iphi, layer by :INDEX = iphi + 64( layer - 1 ) + 1088( ieta + 37 ) - 1 • Structured object fields • sigma : tells the noise rms of the cell • pointers to all possible neighbours within the array • single pointer to be assigned to a CalCell available in data • lots of methods user-friendly • method to read neighbourhood information from a text file (rather than doing awfull, uncheckable code)

  7. Calt42StructNeighbourhood informationhttp://www-d0.fnal.gov/~vlimant/noise-suppdescr/Description.html • How to check ? • Standalone executable return neighbours for a given cell (exist as a method) • Check cell_files and pictures for exceptions descriptions (webpage) • Check the code of the four executables (simple algorithms)

  8. Study effects on data • Data sets • Debugging (preliminary result ) with • recoT_all_0000168619_mrg_116-143.raw_p13.04.00 • MET test (sophie) 1000 evts of • recoT_all_0000168725_mrg_100-107.raw_p13.04.00 output : /work/coco-clued0/vlimant/TK2/runsophie/Recoanalyze.root • W, Z tests (WZ) 10000 evts of • WZskim-emStream-*-*.raw_p13.04.00 under the project name WZstreamTMBp13.04

  9. Population reportoverall result for 10000 evts processing (WZ)http://www-d0.fnal.gov/~vlimant/noise-suppps/WZ_plots/Pop_report_10000_WZ.ps Before1815 After1265 At first(0)1815 At second(4)840

  10. Population reportRegion result

  11. Population reportRegion result Clustered cells Isolated cells

  12. EM changes • Isolation decreases and tightens by 10% • EM fraction tightens by 25% • Hmatrix8 decrease by 5% EMIds increases by 10%

  13. before after

  14. before after

  15. before after

  16. MET changes • MET increase (in mean) W transverse mass with more entries • MEx centered (- 30%) • MEx made more even fewer noise

  17. before after

  18. before after

  19. T42 conclusions Remains to do • Ultimatetly cross check neighbours • Study thresholds for reasonnable loss of cells • More studies on effect on physics • Rootuple with dedicated data block available, help is welcome

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