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CAT plenary meeting. T42 algorithm dedicated webpage : 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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Cat plenary meeting

CAT plenary meeting

T42 algorithm

dedicated webpage :

  • T42 + Top_analyze +d0root_analysis

  • Principle & Implementation

  • Effect on cells

  • Effect on EM objects

VLIMANT Jean-Roch LPNHE 13 may 2003

T42 principle reject isolated medium cells named after an algorithm used in h1
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

Cal t42 package created after cal nada classes
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

Calt42struct class 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 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

Calt42struct use in calt42reco
Calt42Structuse in Calt42Reco

Calt42StructNeighbourhood information

  • How to check ?

    • Trust me

    • WebPage : check rules and pictures

    • Calt42Struct::PrintNeighbours(ieta,iphi,layer)

    • Calorimeter display : to be written

Calt42combine only for dst files
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

In the framework need for post reconstruction when shadow mode
In the frameworkneed for post-reconstruction when shadow mode


In the main rcp

String packagename = “…unpack T42 rebuild …”

T42 = < cal_t42 Calt42> // process the t42 algo


T42 = < cal_t42 Calt42Combine> // only combine chunks

“rebuild” must reconstruct the object chunks you want to see the effect on

Study effects on data
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


    Global_CMT run

  • Min/Zero bias Wzskim 10000 evts of


    Under the project name mzbias_mvh.all1

Population report unstreamed data
Population reportunstreamed data

Cells effect close to beam ec regions
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 |ieta|=33(CH) and 32 (EM, FH)

    • Even lower for FH ?

Region report emstream data
Region reportemstream data

Region report wzstream data with problems
Region reportWZstream data with problems

Region report unstreamed data
Region reportunstreamed data

Region report unstreamed data with problems
Region reportunstreamed data with problems

Region report minimum zero bias data
Region reportminimum/zero bias data

Region report minimum zero bias data with problems
Region reportminimum/zero bias data with problems

Cells effect away from beam cc regions
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)

Cells effect close to the beam
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 ?

Effect on em clusters data mc sets
Effect on EM clustersdata/MC sets

  • Zee picked sample p13.05 2418 evts (not used)

    • Filename : /rooms/living/varnes/scratch/cab/zee-p13/*/tmbfile

  • Zee Monte Carlo p13.08 6000 evts

    • Project name ctf_p13.08_zee_sig2.5_tmb

    • Filename :


  • Estimators study

    • At high/low energy : emstream

    • At low energy : J/ skim from Jan Stark (not used yet)

Effect on em clusters number of cells
Effect on EM clustersNumber of cells

Effect on em clusters number of cells1
Effect on EM clustersNumber of cells

Effect on em clusters estimators pt 13 gev
Effect on EM clustersestimators pT<13 GeV

Effect on emid estimators pt 13 gev
Effect on EMidestimators pT<13 GeV

Effect on electrons estimators pt 13 gev
Effect on electronsestimators pT<13 GeV

Effect on em clusters estimators pt 13 gev1
Effect on EM clustersestimators pT>13 GeV

Effect on emid estimators pt 13 gev1
Effect on EMidestimators pT>13 GeV

Effect on electrons estimators pt 13 gev1
Effect on electronsestimators pT>13 GeV

T42 effects
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

  • Em efficiency fake rates data set
    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



    • 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