CAT plenary meeting

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CAT plenary meeting
T42 algorithm dedicated webpage
http//www-d0.fnal.gov/vlimant/noise-suppdescr/
Description.html

• T42 Top_analyze d0root_analysis
• Principle Implementation
• Effect on cells
• Effect on EM objects

• VLIMANT Jean-Roch LPNHE 13 may 2003

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T42Principle reject isolated medium
cellsNamed after an algorithm used in H1

• Reject negative energy cells
• Select high signal cells (4 sigma)
• Keep their significant neighbours (2 sigma)
• ?Thresholds 2? is 2.5? at the moment

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cal_t42 Packagecreated after cal_nada classes

• Classes
• Calt42Struct neighbourhood object
• Calt42 container for cell lists
• Calt42Chunk container for Calt42 object
• Calt42Reco
• Does the cleaning and creates a Calt42Chunk with
  rejected cells and modify/or not the CalDataChunk
  (killing/shadow mode).
• Get the neighbourhood info from a Calt42Struct
  object which allows a linear algorithm
  complexity.
• Calt42Combine
• When shadow mode in d0reco produces a clean
  CalDataChunk
• When killing mode in d0reco produces a un-clean
  CalDataChunk
• And registerers RegCalt42Reco RegCalt42Combine

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Calt42Reco 1/2
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Calt42Reco 2/2
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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 neighbors within the
  array
• single pointer to be assigned to a CalCell
  available in CalDataChunk
• Methods
• Access
• Fields initialiaser
• The Neighbourhood information is read from the
  file STRUCTURE.dat

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Calt42Structuse in Calt42Reco
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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) Layer 32/33 Exceptions cells Neighbours above or below splited into different layers Intercryostat and nearby cells

• How to check ?
• Trust me
• WebPage check rules and pictures
• Calt42StructPrintNeighbours(ieta,iphi,layer)
• Calorimeter display to be written

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Calt42CombineOnly for DST files

• Only one parameter
• Do you want the t42 cleaned CalDataChunk ?
• Automatic detection of the d0reco mode by cell
  matching. Modification of the CalDataChunk

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In the frameworkneed for post-reconstruction
when shadow mode

• For DST / TMB
• In the main rcp
• String packagename unpack T42 rebuild
• T42 lt cal_t42 Calt42gt // process the t42 algo
• or
• T42 lt cal_t42 Calt42Combinegt // only combine
  chunks
• rebuild must reconstruct the object chunks you
  want to see the effect on

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Study effects on data

• Data sets
• EM stream data 10000 evts of
• WZskim-emStream--.raw_p13.06.01 under the
  project name WZstreamTMBp13.06
• Unstreamed data 10000 evts in files
• recoT_all_0000174234_mrg_-.raw_p14.01.00
• Global_CMT run
• Min/Zero bias Wzskim 10000 evts of
• Wzskim-mzbiasStream--.raw_p13.06.01
• Under the project name mzbias_mvh.all1

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Population reportunstreamed data
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Cells effectclose to beamEC regions

• More rejection than expected noise !
• Too many cells with negative energy arbitrarily
  increases the rejection They are not from
  gaussian noise only, probably due to pile-up
• This is due to cell close to the beam 33-37

• Negative energy rejection is unsuited to this
  region
• Should be treated separately
• Keep untouched above ieta33(CH) and 32 (EM,
  FH)
• Even lower for FH ?

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Region Labels
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Region reportemstream data
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Region reportWZstream data with problems
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Region reportunstreamed data
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Region reportunstreamed data with problems
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Region reportminimum/zero bias data
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Region reportminimum/zero bias data with
problems
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Cells effectaway from beamCC regions

• Statistically noise like rejection
• Always about the same number of negative cells in
  the event probably noise and it is always
  rejected
• Coherent number of rejected cells Region
  occupancies show signal presence
• 40 on unstreamed data
• Cells clustering decreases with the distance to
  interaction point
• -/ rejected ratio for region threshold tuning ?
  Although skim dependent (topology dependence)

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Cells effectclose to the beam

• Still too much rejection in FH part need to be
  investigate
• Peaks are due to
• Overpopulated cells
• Cell with noise problem
• strange regions ?

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Effect on EM clustersdata/MC sets

• Zee picked sample p13.05 2418 evts (not used)
• Filename /rooms/living/varnes/scratch/cab/zee-p1
  3//tmbfile
• Zee Monte Carlo p13.08 6000 evts
• Project name ctf_p13.08_zee_sig2.5_tmb
• Filename
• tmb-x13.08.00_CTF13.08.00-02-z-ee_np_mcp13_hepfm00
  7.uta.edu_null_
• Estimators study
• At high/low energy emstream
• At low energy J/? skim from Jan Stark (not used
  yet)

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Effect on EM clustersNumber of cells
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Effect on EM clustersNumber of cells
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Effect on EM clustersestimators pTlt13 GeV
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Effect on EMidestimators pTlt13 GeV
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Effect on electronsestimators pTlt13 GeV
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Effect on EM clustersestimators pTgt13 GeV
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Effect on EMidestimators pTgt13 GeV
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Effect on electronsestimators pTgt13 GeV
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T42 effects

• 10 more EM cluster (10,11 )
• 20 less above 13 GeV
• 15 more Emid clusters
• 80 more below 13GeV
• 11 more electrons
• 34 more below 13GeV

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EM Efficiency fake ratesdata set

• DIEM15 stream of WZ skim 1.5Mevt
• DIEM15-WZskim-emStream--.raw_p13.06.01 (05)
• under the project name Wzskim_diem
• NEXT TIME

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Conclusion

• Code run into p14 code
• T42 chunk at DST level (checked)
• D0note 4146 update soon
• Noise cleaning
• Electronic noise seems to be deleted
• Pile-up problem near beam pipe remains
• Get more electrons and photons
• NEXT
• Fake and efficiency
• More at low energy with J/? skim