CalTask Force Workshop

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CalTask Force Workshop
T42 algorithm dedicated webpage
http//www-d0.fnal.gov/vlimant/noise-suppdescr/
Description.html

• Principale
• Implementation
• Effect on data
• To come

• VLIMANT Jean-Roch LPNHE 10 feb 2003

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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

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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.

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Calt42Reco
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Calt42Reco
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Calt42StructClass content

• Objects
• spine array81600 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)

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Calt42StructNeighbourhood information
http//www-d0.fnal.gov/vlimant/noise-suppdescr/De
scription.html
Regular cells normal out of fine layers (3,4,5,6) near fine layers (2,7) Exceptions cells Neighbours above or below splited into different layers Intercryostat and nearby cells

• 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)

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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/R
  ecoanalyze.root
• W, Z tests (WZ) 10000 evts of
• WZskim-emStream--.raw_p13.04.00 under the
  project name WZstreamTMBp13.04

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Population reportoverall result for 10000 evts
processing (WZ)http//www-d0.fnal.gov/vlimant/no
ise-suppps/WZ_plots/Pop_report_10000_WZ.ps
Before1815
After1265
At first(0)1815
At second(4)840
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Population reportRegion result
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Population reportRegion result
Clustered cells
Isolated cells
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EM changes

• Isolation decreases and tightens by 10
• EM fraction tightens by 25
• Hmatrix8 decrease by 5
• ?EMIds increases by 10

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before
after
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before
after
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before
after
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MET changes

• MET increase (in mean)
• ?W transverse mass with more entries
• MEx centered (- 30)
• MEx made more even
• ?fewer noise

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before
after
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before
after
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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