This page documents studies of Track matching of electron candidate from TPC to EMCal cluster and get ratio of energy measured in EMCal and momentum from TPC.

Table of contents:

Outline

Here we collect information about track matching of electron candidate from TPC to EMCal cluster and get ratio of energy measured in EMCal and momentum from TPC.

Track matching with LHC10b dataset


Motivation: Track matching of electron candidate from TPC to EMCal cluster and get ratio of energy measured in EMCal and momentum from TPC.

Data used: LHC10b/ pass2

No. of events analysed: 18M

Cuts used for selecting electrons:
1. Reject kink daughter
2. ITS and TPC refit
3. chi square/TPC cluster < 4
4. -0.7 < eta < 07
5. DCA Z < 3
6. DCA XY < 3
7. No of TPC clusters > 80
8. 65 < de/dx < 80

dEdx.gif

Track extrapolation:

  • The electron candidates selected are extrapolated to the YZ plane of the EMCal cluster using the method AliEMCALTrack::PropagateToGlobal. The DeltaEta and DeltaEta between the track and the nearest cluster is calculated (Note that this will not ensure single track matching to single cluster. multiple tracks matched to same cluster is possible.)


DelPhiDelEta.gif

Track Matching:

  • if radius(sqrt(deltaphi^2 + deltaeta^2)) < 0.0143 (cell size), the track and cluster is matched.
  • E/p of the cluster energy and track momentum is plotted in different Pt range and eta range.

Plot of E/p in different Pt bins:

CloseTrkEovP.gif

Plot of E/p in different eta bins:

CloseEta_TrkEovP.gif

Track Matching and E/p ratio with clusters from 3x3 clusterizer:

Motivation: check the ratio of E/p for EMCAL clusters reconstructed with 3x3 clusterizer.

Dataset used: LHC10d pass2

Statistics: 48.7 M (after Physics selection)

Method:

  • Reclusterize EMCAL cells to 3x3 clusters with the task AliAnalysisTaskEMCALClusterize.
  • Select candidate track from TPC by applying selection cuts:
  • Cuts Applied:
  1. Standard track quality cuts:
    1. Reject kink daughters
    2. ITS and TPC refit
    3. Eta range (-0.9 to 0.9)
    4. Require sigma to vertex
  2. DCA < 0.05cm
  3. Min 1 hit on SPD
  4. No of TPC signal > 80
  5. Chi2 for TPC > 3.5
  6. 67 < dEdx < 86
  • Plot of dEdx vs pt is as shown in the fig below

dEdx-03-10.gif

Track extrapolation:

  • The electron candidates selected are extrapolated to the EMCal cluster using the method AliEMCALTrack::PropagateToGlobal. The DeltaPhi and DeltaEta between the track and the nearest cluster is calculated.

DelPhiDelEta-03-10.gif

Track Matching:

  • if radius(sqrt(deltaphi^2 + deltaeta^2)) < 0.02, the track and cluster is matched.

The Effect of the above cuts applied on the tracks is shown in the plot below.

CutEffect-03-10.gif

The E/p of the tracks matched to the EMCAL clusters is shown below in different pt bins.

EovP-03-10.gif

Track matching and E/p comparison with 3x3 and v1 clusterizer :

Motivation: Compare track matching and E/p ratio for EMCAL clusters reconstructed with 3x3 and v1 clusterizer .

Dataset used: LHC10d pass2

Statistics: 104 M (after Physics selection)

Method:

  • Reclusterize EMCAL cells to 3x3 clusters with the task AliAnalysisTaskEMCALClusterize.
  • Select candidate track from TPC by applying selection cuts:
  • Cuts Applied:
  1. Standard track quality cuts:
    1. Reject kink daughters
    2. ITS and TPC refit
    3. Eta range (-0.9 to 0.9)
    4. Require sigma to vertex
  2. DCA < 0.05cm
  3. Min 1 hit on SPD
  4. No of TPC signal > 80
  5. Chi2 for TPC > 3.5
  6. 67 < dEdx < 86
  7. pT > 1GeV/c
  • Plot of dEdx vs pt is as shown in the fig below

dEdx-03-23.gif

Track extrapolation:

  • The electron candidates selected are extrapolated to the EMCal 3x3 and v1 cluster. The DeltaPhi and DeltaEta between the track and the nearest cluster is calculated.

DelPhiDelEta-03-23.gif

Track Matching:

  • if radius(sqrt(deltaphi^2 + deltaeta^2)) < 0.02, the track and cluster is matched.

The E/p of the tracks matched to the EMCAL 3x3 and v1 clusters are shown below in different pt bins.

Eop_3x3-03-23.gif

Eovp_v1-03-23.gif

  • The yield, sigma and mean from the gauss+pol2 fit on the E/p is as shown below.

EovpSpec-03-23.gifEovpMean-03-23.gif

EovpSigma-03-23.gif

The Delta E/p between 3x3 and v1 clusterizer (E/p_3x3 - E/p_v1) is shown below.

DelEovp-03-23.gif

Study of efficiency of cuts applied :

Motivation: To study the efficiency of different cuts applied in track matching.

Dataset used: LHC10d pass2

Cuts Applied:

  1. Standard track quality cuts:
    1. Reject kink daughters
    2. ITS and TPC refit
    3. Eta range (-0.9 to 0.9)
    4. Require sigma to vertex
  2. DCA < 0.05cm
  3. Min 1 hit on SPD
  4. No of TPC signal > 80
  5. Chi2 for TPC > 3.5
  6. 67 < dEdx < 86
  7. pT > 1GeV/c

The plot of no of tracks passing different cuts normalised to the total no of tracks for pT intergrated is shown below.

CutEffect-Ptint-03-29.gif

The plot of total number of tracks in different pT bins (no other cuts applied) is shown in the left panel of lower plot. The no of tracks, in pT bins, passing different track matching cuts normalised to the no of tracks in that pT bins is shown in the right panel.

NTrks_ptbin-03-29.gifCutEffect_ptbin-03-29.gif

The no of tracks passing cuts for intermediate pT bin normalised to total tracks in that pT bin as shown below.

CutEffect_Ptinter-03-29.gif

Track matching and E/p comparison with v1, 3x3 and 5x5 clusterizer :

Motivation: Compare track matching and electron raw spectra for EMCAL clusters reconstructed with v1, 3x3 and 5x5 clusterizer .

Dataset used: LHC10d pass2

Statistics: 51.7 M (after Physics selection)

Method:

  • Reclusterize EMCAL cells to 3x3 and 5x5 clusters with the task AliAnalysisTaskEMCALClusterize.
  • Select candidate track from TPC by applying selection cuts:
  • Cuts Applied:
  1. Standard track quality cuts:
    1. Reject kink daughters
    2. ITS and TPC refit
    3. Eta range (-0.9 to 0.9)
    4. Require sigma to vertex
  2. DCA < 0.05cm
  3. Min 1 hit on SPD
  4. No of TPC signal > 80
  5. Chi2 for TPC > 3.5
  6. 67 < dEdx < 86
  7. pT > 1GeV/c

The E/p distribution with gauss+pol2 fit for v1,3x3 and 5x5 clusterizer is shown below.

EovP_v1-04-07.gif

EovP_3x3-04-07.gif

EovP_5x5-04-07.gif

The summary plots of yield, mean and sigma from the fit is as shown below.

Spectra-04-07.gifMean-04-07.gif

Sigma-04-07.gif

The Efficiency of different cuts applied and total yield extracted in different sigmas for the 3 clusterizers in pT bins is shown below.

CutEffi_Ptint-04-07.gif

NTrks_Ptbin-04-07.gif

CutEffi_Ptbin-04-07.gif

CutEffi_interPt-04-07.gif

The different in the E/p between the 3 clusterizers is quantified using the parameter Delta E/p = (E/p_1 - E/p_2)/(E/p_1+E/p2).

The Delta E/p between 3x3 and v1 clusterizer (E/p_3x3 - E/p_v1)/(E/p_3x3 + E/p_v1) is shown below.

DEovp_3_v1-04-07.gif

The Delta E/p between 3x3 and 5x5 clusterizer (E/p_3x3 - E/p_5x5)/(E/p_3x3 + E/p_5x5) is shown below.

DEovp_3_5-04-07.gif

The Delta E/p between 5x5 and v1 clusterizer (E/p_5x5- E/p_v1)/(E/p_5x5 + E/p_v1) is shown below.

DEovp_5_v1-04-07.gif

Electron spectra for 2.76 TeV data with Minimum bais and EMCAL trigger:

Motivation: Compare raw electron spectra from Minimum bais and EMCAL triggered sample.

Dataset used: LHC11a pass1

Statistics:

  • Mimibum Bais : 24.7 M (after Physics selection)
  • EMCAL trigger : 545 k

Method:

  • Select candidate track from TPC by applying selection cuts:
  • Cuts Applied:
  1. Standard track quality cuts:
    1. Reject kink daughters
    2. ITS and TPC refit
    3. Eta range (-0.9 to 0.9)
    4. Require sigma to vertex
  2. DCA < 0.05cm
  3. Min 1 hit on SPD
  4. No of TPC signal > 80
  5. Chi2 for TPC > 3.5
  6. 75 < dEdx < 95
  7. pT > 1GeV/c

The E/p distribution for MB and EMCAL trigger is as below.

Eovp_MB-04-27.gif

Eovp_EMC-04-27.gif

The raw electron spectra normalised to the no of events, E/p position and sigma from the gaus+pol2 fit is shown below.

spectra-04-27.gif

sigma-04-27.gifmean-04-27.gif

Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif CloseEta_TrkEovP.gif r1 manage 25.2 K 2010-08-10 - 15:32 DeepaThomas E/p of track matched to nearest cluster for different eta range
GIFgif CloseTrkEovP.gif r1 manage 27.1 K 2010-08-10 - 15:32 DeepaThomas E/p of track matched to nearest cluster in different Pt range
GIFgif CutEffect-03-10.gif r1 manage 8.7 K 2011-03-10 - 17:36 DeepaThomas Effect of different cuts applied
GIFgif CutEffect-Ptint-03-29.gif r1 manage 9.4 K 2011-03-29 - 12:22 DeepaThomas Effect of different cuts applied pt integrated (pt>1)
GIFgif CutEffect_Ptinter-03-29.gif r1 manage 11.3 K 2011-03-29 - 12:24 DeepaThomas Effect of different cuts applied in intermediate pt bins
GIFgif CutEffect_ptbin-03-29.gif r1 manage 12.9 K 2011-03-29 - 12:24 DeepaThomas Effect of different cuts applied in pt bins
GIFgif CutEffi_Ptbin-04-07.gif r1 manage 20.0 K 2011-04-07 - 14:00 DeepaThomas Effect of different cuts applied in pt bins
GIFgif CutEffi_Ptint-04-07.gif r1 manage 15.0 K 2011-04-07 - 14:00 DeepaThomas Effect of different cuts applied pt integrated (pt>1)
GIFgif CutEffi_interPt-04-07.gif r1 manage 20.1 K 2011-04-07 - 14:01 DeepaThomas Effect of different cuts applied in intermediate pt bins
GIFgif DEovp_3_5-04-07.gif r1 manage 17.8 K 2011-04-07 - 14:02 DeepaThomas Delta E/p (E/p_3x3 - E/p_5x5)
GIFgif DEovp_3_v1-04-07.gif r1 manage 17.8 K 2011-04-07 - 14:02 DeepaThomas Delta E/p (E/p_3x3 - E/p_v1)
GIFgif DEovp_5_v1-04-07.gif r1 manage 17.4 K 2011-04-07 - 14:03 DeepaThomas Delta E/p (E/p_5x5 - E/p_v1)
GIFgif DelEovp-03-15.gif r1 manage 20.7 K 2011-03-15 - 10:41 DeepaThomas Delta E/p (E/p_3x3 - E/p_v1)
GIFgif DelEovp-03-23.gif r1 manage 23.2 K 2011-03-23 - 10:09 DeepaThomas Delta E/p (E/p_3x3 - E/p_v1)
GIFgif DelPhiDelEta-03-10.gif r1 manage 43.0 K 2011-03-10 - 17:37 DeepaThomas DeltaPhi - DeltaEta between track matched to the nearest cluster
GIFgif DelPhiDelEta-03-14.gif r1 manage 31.1 K 2011-03-15 - 10:38 DeepaThomas DeltaPhi - DeltaEta between track matched to the nearest cluster
GIFgif DelPhiDelEta-03-23.gif r1 manage 40.6 K 2011-03-23 - 10:09 DeepaThomas DeltaPhi - DeltaEta between track matched to the nearest cluster
GIFgif DelPhiDelEta.gif r1 manage 75.0 K 2010-08-10 - 15:33 DeepaThomas DeltaPhi - DeltaEta between track matched to the nearest cluster
GIFgif Eop_3x3-03-15.gif r1 manage 16.5 K 2011-03-15 - 10:40 DeepaThomas E/p of track matched to 3x3 clusters in different Pt range
GIFgif Eop_3x3-03-23.gif r1 manage 16.6 K 2011-03-23 - 10:10 DeepaThomas E/p of track matched to 3x3 clusters in different Pt range
GIFgif EovP-03-10.gif r1 manage 21.9 K 2011-03-10 - 17:37 DeepaThomas E/p of track matched to cluster in different Pt range
GIFgif EovP_3x3-04-07.gif r1 manage 25.3 K 2011-04-07 - 13:57 DeepaThomas E/p of track matched to 3x3 clusters in different Pt range
GIFgif EovP_5x5-04-07.gif r1 manage 25.1 K 2011-04-07 - 13:58 DeepaThomas E/p of track matched to 5x5 clusters in different Pt range
GIFgif EovP_v1-04-07.gif r1 manage 25.2 K 2011-04-07 - 13:57 DeepaThomas E/p of track matched to v1 clusters in different Pt range
GIFgif EovpMean-03-23.gif r1 manage 8.1 K 2011-03-23 - 10:12 DeepaThomas mean from gauss+pol2 fit for E/p
GIFgif EovpSigma-03-23.gif r1 manage 7.7 K 2011-03-23 - 10:11 DeepaThomas sigma from gauss+pol2 fit for E/p
GIFgif EovpSpec-03-23.gif r1 manage 7.0 K 2011-03-23 - 10:13 DeepaThomas Spectra from gauss+pol2 fit for E/p
GIFgif Eovp_3x3-04-04.gif r1 manage 24.0 K 2011-04-04 - 15:43 DeepaThomas E/p of track matched to 3x3 clusters in different Pt range
GIFgif Eovp_5x5-04-04.gif r1 manage 24.5 K 2011-04-04 - 15:44 DeepaThomas E/p of track matched to 5x5 clusters in different Pt range
GIFgif Eovp_EMC-04-21.gif r1 manage 21.9 K 2011-04-21 - 22:45 DeepaThomas E/p of track matched to v1 clusters in different Pt range (EMC trigger)
GIFgif Eovp_EMC-04-27.gif r1 manage 22.3 K 2011-04-27 - 10:56 DeepaThomas E/p of track matched to v1 clusters in different Pt range (EMC trigger)
GIFgif Eovp_MB-04-21.gif r1 manage 15.9 K 2011-04-21 - 22:45 DeepaThomas E/p of track matched to v1 clusters in different Pt range (MB trigger)
GIFgif Eovp_MB-04-27.gif r1 manage 17.4 K 2011-04-27 - 10:56 DeepaThomas E/p of track matched to v1 clusters in different Pt range (MB trigger)
GIFgif Eovp_v1-03-15.gif r1 manage 16.6 K 2011-03-15 - 10:40 DeepaThomas E/p of track matched to v1 clusters in different Pt range
GIFgif Eovp_v1-03-23.gif r1 manage 17.3 K 2011-03-23 - 10:11 DeepaThomas E/p of track matched to v1 clusters in different Pt range
GIFgif Mean-04-07.gif r1 manage 8.1 K 2011-04-07 - 13:58 DeepaThomas mean from gauss+pol2 fit for E/p
GIFgif NTrks_Ptbin-04-07.gif r1 manage 6.7 K 2011-04-07 - 14:01 DeepaThomas Total No of tracks in different pT bins
GIFgif NTrks_ptbin-03-29.gif r1 manage 5.9 K 2011-03-29 - 12:23 DeepaThomas Total No of tracks in different pT bins
GIFgif Sigma-04-07.gif r1 manage 7.8 K 2011-04-07 - 13:59 DeepaThomas sigma from gauss+pol2 fit for E/p
GIFgif Spectra-04-07.gif r1 manage 7.6 K 2011-04-07 - 13:58 DeepaThomas Spectra from gauss+pol2 fit for E/p
GIFgif cutEffect_ptInt-03-14.gif r1 manage 9.2 K 2011-03-15 - 10:39 DeepaThomas Effect of different cuts applied pt integrated (pt>1)
GIFgif cutEffect_ptbin-03-14.gif r1 manage 12.6 K 2011-03-15 - 10:39 DeepaThomas Effect of different cuts applied in pt bins
GIFgif dEdx-03-10.gif r1 manage 34.3 K 2011-03-10 - 17:42 DeepaThomas DeltaPhi - DeltaEta between track matched to the nearest cluster
GIFgif dEdx-03-14.gif r2 r1 manage 34.8 K 2011-03-16 - 13:00 DeepaThomas dEdx plot
GIFgif dEdx-03-23.gif r2 r1 manage 33.8 K 2011-03-23 - 10:22 DeepaThomas dEdx plot
GIFgif dEdx.gif r1 manage 42.0 K 2010-08-10 - 15:31 DeepaThomas dEdx plot
GIFgif mean-04-21.gif r1 manage 7.2 K 2011-04-21 - 22:47 DeepaThomas mean for MB and EMC trigger
GIFgif mean-04-27.gif r1 manage 7.7 K 2011-04-27 - 10:56 DeepaThomas mean for MB and EMC trigger
GIFgif mean_3_5-04-04.gif r1 manage 7.5 K 2011-04-04 - 15:45 DeepaThomas mean from gauss+pol2 fit for E/p
GIFgif sigma-04-21.gif r1 manage 8.4 K 2011-04-21 - 22:48 DeepaThomas sigma for MB and EMC trigger
GIFgif sigma-04-27.gif r1 manage 8.6 K 2011-04-27 - 10:57 DeepaThomas sigma for MB and EMC trigger
GIFgif sigma_3_5-04-04.gif r1 manage 7.0 K 2011-04-04 - 15:45 DeepaThomas sigma from gauss+pol2 fit for E/p
GIFgif spectra-04-21.gif r1 manage 8.0 K 2011-04-21 - 22:46 DeepaThomas raw spectra for MB and EMC trigger
GIFgif spectra-04-27.gif r1 manage 8.5 K 2011-04-27 - 10:57 DeepaThomas raw spectra for MB and EMC trigger
GIFgif spectra_3_5-04-04.gif r1 manage 7.4 K 2011-04-04 - 15:46 DeepaThomas Spectra from gauss+pol2 fit for E/p
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Topic revision: r13 - 2012-01-27 - Ssakai
 
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