CalTask Force Workshop

VLIMANT Jean-Roch LPNHE 10 feb 2003

T42 algorithmdedicated webpage :

http://www-d0.fnal.gov/~vlimant/noise-suppdescr/Description.html

PrincipaleImplementationEffect on dataTo come

T42Principale : reject isolated medium cells

Named after an algorithm used in H1

Select high signal cells (4 sigma) Keep their significant neighbours (2 sigma)

Thresholds to be tuned

What neighbours means

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.

Calt42RecoCalCell

Is to be keptanyway ? KeepList

Is above firstthreshold ?

Is above secondthreshold ?

TrashList

AccessList

Alogirthm framework (part1)

Calt42RecoAccess List

cell

Is present ?KeepList

Alogirthm framework (part2)

Loop overneighbours

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)

Calt42StructNeighbourhood information

http://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)

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

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

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 second(4)840

At first(0)1815

Population reportRegion result

237 138 (60) 55.6 17.9 (32) 7.87 0.23 (3) 762 601 (78) 600 435 (73) 56.5 6.2 (11) 54 36 (67) 43 28 (65)

before after (%)

Population reportRegion result

237 138 (60) : 40% 55.6 17.9 (32) : 38% 7.87 0.23 (3) : 60% 762 601 (78) : 31 % 600 435 (73) : 37 % 56.5 6.2 (11) : 41% 54 36 (67) : 42% 43 28 (65) : 12%

before after : % from neighbours below second threshlod

Isolated cells

Clustered cells

Isolation decreases and tightens by 10% EM fraction tightens by 25% Hmatrix8 decrease by 5%

EMIds increases by 10%

EM changes

MET increase (in mean)W transverse mass with more entries

MEx centered (- 30%) MEx made more even

fewer noise

MET changes

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