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ENERGY RECOVERY OF THE CMS ELECTROMAGNETIC
CALORIMETER DEAD CHANNELS
Daskalakis Georgios, Geralis Theodoros, Kesisoglou Stilianos, Manolakos Ioannis, Eleni Ntomari
1
XXIX Workshop on Recent Advances in Particle Physics and Cosmology
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Introduction Description of the method Position Estimation Energy Estimation Conclusions-future plans
Outline
21/04/23 Eleni Ntomari - NCSR Demokritos 2
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21/04/23 Eleni Ntomari - NCSR Demokritos 3
CMS detector
ECAL One of the most accurate, distinctive and important subdetectors of the CMS experiment
Measurements of electrons and photons with an excellent energy resolution essential in the search for new physics, in particular for the postulated Higgs boson.
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ECAL Endcap
ECAL Barrel
61 200 lead tungstate (PbWO4 ) crystals mounted in the central barrel
7 324 crystals in each of the two endcaps
21/04/23 Eleni Ntomari - NCSR Demokritos 4
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ECAL Endcap
ECAL Barrel
21/04/23 Eleni Ntomari - NCSR Demokritos 5
The electromagnetic calorimeter is designed to perform precision measurements aiming to reach 0.5% energy resolution at high energy.
36 supermodules made of 85x20 crystals, each one divided into 4 modules.
Each Endcap is divided into 2 halves and is logically organized in 9 sectors of 40 degrees each.
A preshower detector is placed in front of the endcap crystals.
identify neutral pions in the endcaps within a fiducial region 1.653 < |η| < 2.6.
identification of electrons against minimum ionizing particles
improves the position determination of electrons and photons with high granularity.
Preshower based on Si sensors
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Dead Channels-How important is it to develop a recovery algorithm?
~1% of the Electromagnetic Calorimeter Channels present problems (e.g. noisy channels, poor response) ->cannot be used for the energy estimation of the particles that "hit" near them.
21/04/23 Eleni Ntomari - NCSR Demokritos 6
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Dead Channels-How important is it to develop a recovery algorithm?
~1% of the Electromagnetic Calorimeter Channels present problems (e.g. noisy channels, poor response) ->cannot be used for the energy estimation of the particles that "hit" near them.
21/04/23 Eleni Ntomari - NCSR Demokritos 7
Crystal 6
8 13 18
7 12 17
6 11 16
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Dead Channels-How important is it to develop a recovery algorithm?
~1% of the Electromagnetic Calorimeter Channels present problems (e.g. noisy channels, poor response) ->cannot be used for the energy estimation of the particles that "hit" near them.
21/04/23 Eleni Ntomari - NCSR Demokritos 8
Crystal 7
8 13 18
7 12 17
6 11 16
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Method description Effort to develop recovery algorithms, in order to be
able to estimate the energy of these Dead Channels, using the energy of their neighboring functioning crystals
21/04/23 Eleni Ntomari - NCSR Demokritos 9
Build position reconstruction functions using energies from all crystals
in a 5x5 or 3x3 grid, except from the missing one
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Method description
21/04/23 Eleni Ntomari - NCSR Demokritos 10
Effort to develop recovery algorithms, in order to be able to estimate the energy of these Dead Channels, using the energy of their neighboring functioning crystals
Build position reconstruction functions using energies from all crystals
in a 5x5 or 3x3 grid, except from the missing one
Build energy correction functions using Monte Carlo
Energy fraction Dead Channel Energy
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Method description
21/04/23 Eleni Ntomari - NCSR Demokritos 11
Effort to develop recovery algorithms, in order to be able to estimate the energy of these Dead Channels, using the energy of their neighboring functioning crystals
Build position reconstruction functions using energies from all crystals
in a 5x5 or 3x3 grid, except from the missing one
Build energy correction functions using Monte Carlo
Energy fraction Dead Channel Energy
Apply functions in areas with dead channelsTests with 2010 Collision Data
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Method description
Build position reconstruction functions using energies from all crystals
in a 5x5 or 3x3 grid, except from the missing one
Build energy correction functions using Monte Carlo
Energy fraction Dead Channel Energy
Apply functions in areas with dead channelsTests with 2010 Collision Data
Data Samples
/EG/Run2010A-Sep17ReReco-v2/RECO
/Electron/Run2010B-PromptReco-v2/RECO
/EG/Run2010A-Nov4ReReco-v2/RECO
/Electron/Run2010B-Nov4ReReco_v2/RECO
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Effort to develop recovery algorithms, in order to be able to estimate the energy of these Dead Channels, using the energy of their neighboring functioning crystals
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8 13 18
7 12 17
6 11 16
Estimate the true position of the hit (photon or electron)
Photon: information of the supercluster
Electron/Positron: information of the supercluster or the tracker
Reconstruction of the event position:
Scurve Method :
Logarithmic weighted method:
Event position reconstruction
η
φ
ii
ii
i
w
xwestimX
8E
Ew ii
80 log
E
Eww i
i
21/04/23 Eleni Ntomari - NCSR Demokritos 13
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8 13 18
7 12 17
6 11 16
Estimate the true position of the hit (photon or electron)
Photon: information of the supercluster
Electron/Positron: information of the supercluster or the tracker
Reconstruction of the event position:
Scurve Method :
Logarithmic weighted method:
Event position reconstruction
Most energetic crystal
η
φ
ii
ii
i
w
xwestimX
8E
Ew ii
80 log
E
Eww i
i
21/04/23 Eleni Ntomari - NCSR Demokritos 14
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8 13 18
7 12 17
6 11 16
Estimate the true position of the hit (photon or electron)
Photon: information of the supercluster
Electron/Positron: information of the supercluster or the tracker
Reconstruction of the event position:
Scurve Method :
Logarithmic weighted method:
Most energetic crystal
Dead crystal η
φ
ii
ii
i
w
xwestimX
8E
Ew ii
80 log
E
Eww i
i
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Event position reconstruction
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8 13 18
7 12 17
6 11 16
Estimate the true position of the hit (photon or electron)
Photon: information of the supercluster
Electron/Positron: information of the supercluster or the tracker
Reconstruction of the event position:
Scurve Method :
Logarithmic weighted method:
Most energetic crystal
Dead crystal η
φ
EstimX [mm]
Tru
eX
-Es
tim
X [
mm
]
EstimY [mm]
Tru
eY
-Es
tim
Y[m
m]
ii
ii
i
w
xwestimX
8E
Ew ii
80 log
E
Eww i
i
21/04/23 Eleni Ntomari - NCSR Demokritos 16
Event position reconstruction
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Position Resolution - Crystal 68 13 18
7 12 17
6 11 16
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2010 Collision DATA
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Position Resolution - Crystal 68 13 18
7 12 17
6 11 16
11/04/11 Eleni Ntomari - NCSR Demokritos 18
2010 Collision DATA
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Position Resolutions - X
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2010 Collision DATA
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Energy Correction functions (Monte Carlo e+/e-)
21/04/23 Eleni Ntomari - NCSR Demokritos 20
The most energetic crystal (12) is split in 25 subdivisions
In most of the cases, the energy fraction follows a Gaussian distribution
The Gauss fit mean value is used to extract the constants of the formula that calculates the corrected fraction:
o f(η,φ): energy fraction (fr=Edc/Sum9)
o n, φ: hit coordinates on the crystal
o aij: constants to be defined
Fraction = f(η,φ) = Edc/sum9→Edc = (fraction x sum8 )/(1 – fraction)
4,...,0,,),(,
jiaf j
ji
iij
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Energy Correction functions (Monte Carlo e+/e-)
4 9 14 19 24
3 8 13 18 23
2 7 12 17 22
1 6 11 16 21
0 5 10 15 20
21/04/23 Eleni Ntomari - NCSR Demokritos 21
The most energetic crystal (12) is split in 25 subdivisions
In most of the cases, the energy fraction follows a Gaussian distribution
The Gauss fit mean value is used to extract the constants of the formula that calculates the corrected fraction:
o f(η,φ): energy fraction (fr=Edc/Sum9)
o n, φ: hit coordinates on the crystal
o aij: constants to be defined
Fraction = f(η,φ) = Edc/sum9→Edc = (fraction x sum8 )/(1 – fraction)
4,...,0,,),(,
jiaf j
ji
iij
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Energy Correction functions (Monte Carlo e+/e-)
4 9 14 19 24
3 8 13 18 23
2 7 12 17 22
1 6 11 16 21
0 5 10 15 20
21/04/23 Eleni Ntomari - NCSR Demokritos 22
The most energetic crystal (12) is split in 25 subdivisions
In most of the cases, the energy fraction follows a Gaussian distribution
The Gauss fit mean value is used to extract the constants of the formula that calculates the corrected fraction:
o f(η,φ): energy fraction (fr=Edc/Sum9)
o n, φ: hit coordinates on the crystal
o aij: constants to be defined
Fraction = f(η,φ) = Edc/sum9→Edc = (fraction x sum8 )/(1 – fraction)
4,...,0,,),(,
jiaf j
ji
iij
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Energy Resolutions
Sum8/Sum9
Sum8+Edc/Sum9
8 13 18
7 12 17
6 11 16
21/04/23 Eleni Ntomari - NCSR Demokritos 23
2010 Collis
ion DATA
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Energy Resolutions
Sum8/Sum9
Sum8+Edc/Sum9
8 13 18
7 12 17
6 11 16
8 13 18
7 12 17
6 11 16
21/04/23 Eleni Ntomari - NCSR Demokritos 24
2010 Collis
ion DATA
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RD: Electrons (Scurve_RD_e+e-, Spline_MC_e+e-, η>0)
11/04/11 Eleni Ntomari - NCSR Demokritos 25
2010 Collision DATA
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RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0,elept>30, fbrem<0.1)RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-, η>0)
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2010 Collision DATA
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First analysis with Monte Carlo photons, electrons and positrons gives promising results
Conclusions
11/04/11 Eleni Ntomari - NCSR Demokritos 27
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First analysis with Monte Carlo photons, electrons and positrons gives promising results
Tests of this method on Real Data appears to be quite satisfactory for both electrons and positrons, as well as EB+ and EB-
Conclusions
11/04/11 Eleni Ntomari - NCSR Demokritos 28
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First analysis with Monte Carlo photons, electrons and positrons gives promising results
Tests of this method on Real Data appears to be quite satisfactory for both electrons and positrons, as well as EB+ and EB-
The correction functions estimate correctly the impact position and the missing energy of the problematic channel
Conclusions
11/04/11 Eleni Ntomari - NCSR Demokritos 29
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First analysis with Monte Carlo photons, electrons and positrons gives promising results
Tests of this method on Real Data appears to be quite satisfactory for both electrons and positrons, as well as EB+ and EB-
The correction functions estimate correctly the impact position and the missing energy of the problematic channel
Studies will be extended in the ECAL endcaps
Conclusions
11/04/11 Eleni Ntomari - NCSR Demokritos 30
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First analysis with Monte Carlo photons, electrons and positrons gives promising results
Tests of this method on Real Data appears to be quite satisfactory for both electrons and positrons, as well as EB+ and EB-.
The correction functions estimate correctly the impact position and the missing energy of the problematic channel.
Studies will be extended in the ECAL endcaps With more data, it'll be possible to built the position
corrections from data, without any usage of Monte Carlo
Conclusions
11/04/11 Eleni Ntomari - NCSR Demokritos 31
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First analysis with Monte Carlo photons, electrons and positrons gives promising results
Tests of this method on Real Data appears to be quite satisfactory for both electrons and positrons, as well as EB+ and EB-.
The correction functions estimate correctly the impact position and the missing energy of the problematic channel.
Studies will be extended in the ECAL endcaps With more data, it'll be possible to built the position
corrections from data, without any usage of Monte Carlo
The ultimate goal is to pass these corrections to CMS framework
Conclusions
11/04/11 Eleni Ntomari - NCSR Demokritos 32
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Back up Slides
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Eleni Ntomari - NCSR Demokritos
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Energy Resolutions
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Real Data (W)ElectronsPositrons
Scurves from electrons-positrons Real Data Spline from MC electrons-positrons
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RD: Electrons (Scurve_RD_e+e-, Spline_MC_e+e-)
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RD: Electrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta>0)
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RD: Electrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0)
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RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-)
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RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0,elept>30, fbrem<0.1)
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RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta>0)
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RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0,elept>30, fbrem<0.1)
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RD: Positrons (Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0)
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Position Resolutions
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Real Data (W)ElectronsPositrons
Scurves from electrons-positrons Real Data Spline from MC electrons-positrons
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Real Data- Electrons X-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0
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Real Data- Positrons X-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0
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Real Data- Electrons X-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta>0
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Real Data- Positrons X-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta>0
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Real Data- Electrons Y-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0
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Real Data- Positrons Y-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta<0
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Real Data- Electrons Y-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta>0
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Real Data- Positrons Y-Resolution, Scurve_RD_e+e-, Spline_MC_e+e-, ceta>0
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