Electron-faking-tau Veto Optimization in 2012

Introduction

This twiki provides documentation for the electron-faking-tau veto (eveto) reoptimization in autumn 2012.

The veto is a BDT made with TMVA and scripted via taumva. The veto is trained and tested on taus (signal) and electrons (background) from DY/Zleplep MC.

Contact Alex Tuna (tuna at cern dot ch) for questions are concerns about the measurement.

Plots

Plots of input variables can be found here.

For now, plots of BDT investigations can be found in the Version notes section.

Input variables

17 variables were considered for the BDT. (Please alert Alex if the descriptions are incorrect!) Some notes are included.

• absdeltaeta : The difference between the cluster eta and the leading track eta.
  • Created by hand to mimic variables like el_deltaEta1, which are used in electron identification.
• absdeltaphi : The difference between the cluster phi and the leading track phi.
  • See notes for absdeltaeta .
• calcVars_corrFTrk : 1.0 / etOverPtLeadTrk, with a nVertex correction.
• calcVars_corrCentFrac : Same as seedCalo_centFrac, with a nVertex correction applied.
• calcVars_ChPiEMEOverCaloEME : (Leading track momentum - energy of the HCAL) divided by the energy of the ECAL.
  • E3 is part of the HCAL term.
  • "Leading track momentum" is actually sum of track momenta, but here we only have one track.
• calcVars_EMFractionAtEMScale_moveE3 : The fraction of energy deposited in the ECAL versus the energy deposited in the ECAL + HCAL.
  • Here, E3 is moved from the HCAL term to the ECAL term by hand.
  • This version of EMFraction is better modeled than the d3pd version because E3 is mis-modeled in 2012.
• calcVars_pi0BDTPrimaryScore : The score of the tau pi0 BDT.
  • This is not used in the training because the tight timescale does not allow for sufficient studies.
• calcVars_PSSFraction : The fraction of energy deposited in the pressampler plus strips versus the energy deposited in the ECAL + HCAL.
• etOverPtLeadTrk : The energy of the ECAL + HCAL divided by the momentum of the leading track.
  • Not used because it is redundant with calcVars_corrFTrk.
• seedCalo_centFrac : The amount of ECAL energy with dR < 0.1 divded by the total ECAL energy (does not include E3).
  • Not used because it is redundant with calcVars_corrCentFrac .
• seedCalo_hadRadius : The equivalent of emRadius, except in the HCAL.
  • Not used at high eta because the contribution of E3 is mis-modeled.
• seedCalo_isolFrac : The amount of ECAL energy in a dR ring from 0.1 to 0.2 divded by the total ECAL energy (does not include E3).
• seedTrk_hadLeakEt : The amount of energy in the zeroth layer of the HCAL divided by the leading track momentum.
• seedTrk_secMaxStripEt : The maximum single strip energy in a 100x3 eta/phi window of the strips.
  • Only used in the barrel because it is not well defined in the crack and for track eta > 1.7.
• seedTrk_secMaxStripEtOverPt : seedTrk_secMaxStripEt divided by the leading track momentum.
  • Created by hand to reduce momentum-dependence of seedTrk_secMaxStripEt.
• seedTrk_sumEMCellEtOverLeadTrkPt : The energy of the ECAL divided by the momentum of the leading track (includes E3).
  • Not used because it is redundant with etOverPtLeadTrk and calcVars_corrFTrk.
• TRTHTOverLT_LeadTrk : The ratio of high threshold TRT hits to low threshold hits of the leading track.
  • Not used at high eta because the TRT coverage ends near 2.00.

Some helpful links for understanding how the input variables are made:

• TauDetailsManager (calcVars_*)
• tauRec/TauCommonCalcVars (more calcVars_*)
• tauRec/TauElectronVetoVariables (seedTrk_*)
• tauRec/TauCellVariables (seedCalo_*)

Grooming

Before being fed to taumva, taus from the d3pd are groomed as follows:

• pT > 20 GeV
• eta (cluster) < 2.5
• numTrack = 1
• author = 1 | 3
• pass JetBDTLoose
• categorization:
  • signal:
    • trueTauAssoc_index >= 0
  • background:
    • Leading truth object in dR cone is electron or photon (same as 2012 SF measurement)
    • No overlap with tightPP electrons

Sample statistics

Sample	pT range (GeV)	eta range	# events
Ztautau	15 -- 60	0.00 -- 0.80	908166
Ztautau	15 -- 60	0.80 -- 1.37	606908
Ztautau	15 -- 60	1.37 -- 1.52	150065
Ztautau	15 -- 60	1.52 -- 2.00	484130
Ztautau	15 -- 60	2.00 -- 3.00	421871
Zee	15 -- 60	0.00 -- 0.80	541343
Zee	15 -- 60	0.80 -- 1.37	490158
Zee	15 -- 60	1.37 -- 1.52	494821
Zee	15 -- 60	1.52 -- 2.00	370932
Zee	15 -- 60	2.00 -- 3.00	246371
DYtautau	60 -- 999	0.00 -- 0.80	427489
DYtautau	60 -- 999	0.80 -- 1.37	214597
DYtautau	60 -- 999	1.37 -- 1.52	36633
DYtautau	60 -- 999	1.52 -- 2.00	89852
DYtautau	60 -- 999	2.00 -- 3.00	39533
DYee	60 -- 999	0.00 -- 0.80	43608
DYee	60 -- 999	0.80 -- 1.37	37467
DYee	60 -- 999	1.37 -- 1.52	99135
DYee	60 -- 999	1.52 -- 2.00	21086
DYee	60 -- 999	2.00 -- 3.00	13900

Version notes

v10-02 (2012-12-02-14h29m14s)

• 6 or 5 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training of endcap, low pT category. NB: secMaxStripEtOverPt and TRTHToverLT are not considered here because the variables are not valid in the endcap.
• Three N-1 trainings crashed.
• Some over-training, but not dramatic.
• Action item: Discuss with SM.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.810
Drop absdeltaeta	0.788
Drop corrFTrk	N/A
Drop EMFraction	0.691
Drop PSSFraction	N/A
Drop isolFrac	N/A
Drop hadLeakEt	0.776

v10-01 (2012-12-02-12h39m40s)

• 7 or 6 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training of endcap, low pT category. NB: secMaxStripEtOverPt and TRTHToverLT are not considered here because the variables are not valid in the endcap.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove absdeltaphi, retrain. Discuss with SM.

Input variable configuration	Sig eff for bkg @ 0.01
All 7 variables	0.824
Drop absdeltaeta	0.805
Drop absdeltaphi	0.810
Drop corrFTrk	0.792
Drop EMFraction	0.706
Drop PSSFraction	0.802
Drop isolFrac	0.798
Drop hadLeakEt	0.792

v10-00 (2012-12-02-12h08m03s)

• 8 or 7 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training of endcap, low pT category. NB: secMaxStripEtOverPt and TRTHToverLT are not considered here because the variables are not valid in the endcap.
• One N-1 training crashed, when absdeltaphi was removed.
• Some over-training, but not dramatic.
• Action item: Remove corrCentFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
Drop EMFraction	0.714
Drop corrFTrk	0.797
Drop hadLeakEt	0.797
Drop absdeltaeta	0.806
Drop PSSFraction	0.806
Drop isolFrac	0.819
Drop corrCentFrac	0.824
All 8 variables	0.827
Drop absdeltaphi	N/A

v09-03 (2012-12-02-11h47m19s)

• 6 or 5 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Minor over-training.
• Action item: Move to next kinematic category.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.863
Drop absdeltaeta	0.821
Drop corrFTrk	0.827
Drop EMFraction	0.816
Drop PSSFraction	0.839
Drop hadLeakEt	0.826
Drop TRTHTOverLT	0.746

v09-02 (2012-12-02-11h24m34s)

• 7 or 6 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• One N-1 training crashed, when EMFraction was removed.
• Some over-training, but not dramatic.
• Action item: Remove absdeltaphi, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 7 variables	0.878
Drop absdeltaeta	0.844
Drop absdeltaphi	0.863
Drop corrFTrk	0.837
Drop EMFraction	N/A
Drop PSSFraction	0.855
Drop hadLeakEt	0.846
Drop TRTHTOverLT	0.755

v09-01 (2012-12-02-10h58m10s)

• 8 or 7 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove isolFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 8 variables	0.890
Drop absdeltaeta	0.858
Drop absdeltaphi	0.875
Drop corrFTrk	0.856
Drop EMFraction	0.851
Drop PSSFraction	0.863
Drop isolFrac	0.878
Drop hadLeakEt	0.866
Drop TRTHTOverLT	0.774

v09-00 (2012-12-02-10h27m51s)

• 9 or 8 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training of barrel extended, low pT category. NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove corrCentFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.893
Drop absdeltaeta	0.862
Drop absdeltaphi	0.878
Drop corrFTrk	0.860
Drop corrCentFrac	0.890
Drop EMFraction	0.857
Drop PSSFraction	0.869
Drop isolFrac	0.887
Drop hadLeakEt	0.869
Drop TRTHTOverLT	0.781

v08-04 (2012-12-02-10h09m54s)

• 5 or 4 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Minimal over-training.
• Action item: Move to next kinematic category.

Input variable configuration	Sig eff for bkg @ 0.01
All 5 variables	0.846
Drop absdeltaeta	0.806
Drop corrFTrk	0.816
Drop corrCentFrac	0.813
Drop hadLeakEt	0.724
Drop TRTHTOverLT	0.645

v08-03 (2012-12-02-09h50m28s)

• 6 or 5 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove absdeltaphi, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.867
Drop absdeltaeta	0.831
Drop absdeltaphi	0.846
Drop corrFTrk	0.827
Drop corrCentFrac	0.840
Drop hadLeakEt	0.748
Drop TRTHTOverLT	0.669

v08-02 (2012-12-02-08h59m45s)

• 7 or 6 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove PSSFraction, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 7 variables	0.888
Drop absdeltaeta	0.859
Drop absdeltaphi	0.865
Drop corrFTrk	0.858
Drop corrCentFrac	0.864
Drop PSSFraction	0.867
Drop hadLeakEt	0.847
Drop TRTHTOverLT	0.727

v08-01 (2012-12-02-08h34m42s)

• 8 or 7 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove EMFraction, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 8 variables	0.899
Drop absdeltaeta	0.868
Drop absdeltaphi	0.877
Drop corrFTrk	0.872
Drop corrCentFrac	0.876
Drop EMFraction	0.888
Drop PSSFraction	0.879
Drop hadLeakEt	0.868
Drop TRTHTOverLT	0.750

v08-00 (2012-12-02-07h59m12s)

• 9 or 8 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training of crack, low pT category. NB: secMaxStripEtOverPt is not considered here because the variable is not filled in the crack.
• No trainings crashed.
• Some over-training, but not dramatic.
• Action item: Remove isolFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.899
Drop absdeltaeta	0.870
Drop absdeltaphi	0.882
Drop corrFTrk	0.875
Drop corrCentFrac	0.896
Drop EMFraction	0.892
Drop PSSFraction	0.883
Drop isolFrac	0.899
Drop hadLeakEt	0.868
Drop TRTHTOverLT	0.760

v07-04 (2012-12-02-06h54m45s)

• 6 or 5 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Negligible over-training.
• No obvious input variable candidate for removal.
• Action item: Discuss with SM. Move to next kinematic category.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.805
Drop absdeltaeta	0.740
Drop corrFTrk	0.726
Drop EMFraction	0.759
Drop hadLeakEt	0.748
Drop secMaxStripEtOverPt	0.735
Drop TRTHTOverLT	0.662

v07-03 (2012-12-02-06h32m05s)

• 7 or 6 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• One N-1 training crashed, when corrFTrk was removed.
• Some over-training, but not dramatic, and reduced from previous iteration.
• Action item: Remove PSSFraction, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 7 variables	0.820
Drop absdeltaeta	0.757
Drop corrFTrk	N/A
Drop EMFraction	0.779
Drop PSSFraction	0.805
Drop hadLeakEt	0.781
Drop secMaxStripEtOverPt	0.762
Drop TRTHTOverLT	0.698

v07-02 (2012-12-02-05h05m16s)

• 8 or 7 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Some over-training, but not dramatic, and reduced from previous iteration.
• Action item: Remove isolFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 8 variables	0.835
Drop absdeltaeta	0.775
Drop corrFTrk	0.785
Drop EMFraction	0.815
Drop PSSFraction	0.818
Drop isolFrac	0.820
Drop hadLeakEt	0.815
Drop secMaxStripEtOverPt	0.789
Drop TRTHTOverLT	0.718

v07-01 (2012-12-02-04h37m07s)

• 9 or 8 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• Two N-1 training crashed, when isolFrac or secMaxStripEtOverPt was removed.
• Some over-training, but not dramatic.
• Action item: Remove absdeltaphi, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.853
Drop absdeltaeta	0.804
Drop absdeltaphi	0.835
Drop corrFTrk	0.802
Drop EMFraction	0.828
Drop PSSFraction	0.833
Drop isolFrac	N/A
Drop hadLeakEt	0.835
Drop secMaxStripEtOverPt	N/A
Drop TRTHTOverLT	0.729

v07-00 (2012-12-02-03h59m35s)

• 10 or 9 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training of barrel outer, low pT category.
• One N-1 training crashed, when isolFrac was removed.
• Some over-training, but not dramatic.
• Action item: Remove corrCentFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 10 variables	0.856
Drop absdeltaeta	0.809
Drop absdeltaphi	0.841
Drop corrFTrk	0.806
Drop corrCentFrac	0.853
Drop EMFraction	0.834
Drop PSSFraction	0.840
Drop isolFrac	N/A
Drop hadLeakEt	0.837
Drop secMaxStripEtOverPt	0.813
Drop TRTHTOverLT	0.738

v06-04 (2012-12-01-17h42m19s)

• 6 or 5 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• Two N-1 trainings crashed, when absdeltaeta or corrFTrk was removed.
• Still over-training, but improved from previous iteration.
• Action item: Discuss with SM. No obvious candidate for removal.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.786
Drop absdeltaeta	N/A
Drop corrFTrk	N/A
Drop EMFraction	0.753
Drop hadLeakEt	0.647
Drop secMaxStripEtOverPt	0.753
Drop TRTHTOverLT	0.651

v06-03 (2012-12-01-17h34m29s)

• 7 or 6 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• One N-1 trainings crashed, when absdeltaeta was removed.
• Still significant over-training, but improved from previous iteration.
• Action item: Remove isolFrac, retrain in hope over-training is reduced with fewer input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 7 variables	0.801
Drop absdeltaeta	N/A
Drop corrFTrk	0.756
Drop EMFraction	0.779
Drop isolFrac	0.786
Drop hadLeakEt	0.693
Drop secMaxStripEtOverPt	0.762
Drop TRTHTOverLT	0.684

v06-02 (2012-12-01-17h25m55s)

• 8 or 7 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• Two N-1 trainings crashed, when isolFrac or absdeltaeta was removed.
• Still significant over-training, but improved from previous iteration.
• Action item: Remove absdeltaphi, retrain in hope over-training is reduced with fewer input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 8 variables	0.805
Drop absdeltaeta	N/A
Drop absdeltaphi	0.801
Drop corrFTrk	0.764
Drop EMFraction	0.775
Drop isolFrac	N/A
Drop hadLeakEt	0.715
Drop secMaxStripEtOverPt	0.758
Drop TRTHTOverLT	0.691

v06-01 (2012-12-01-17h17m14s)

• 9 or 8 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• One N-1 training crashed, when isolFrac was removed.
• Still significant over-training.
• Action item: Remove corrCentFrac, retrain in hope over-training is reduced with fewer input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.810
Drop absdeltaeta	0.792
Drop absdeltaphi	0.804
Drop corrFTrk	0.763
Drop corrCentFrac	0.805
Drop EMFraction	0.789
Drop isolFrac	N/A
Drop hadLeakEt	0.734
Drop secMaxStripEtOverPt	0.771
Drop TRTHTOverLT	0.697

v06-00 (2012-12-01-17h07m32s)

• 10 or 9 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• First training of merge barrel, high pT category.
• No trainings crashed.
• Still significant over-training.
• Action item: Remove PSSFraction, retrain in hope over-training is reduced with fewer input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 10 variables	0.817
Drop absdeltaeta	0.797
Drop absdeltaphi	0.803
Drop corrFTrk	0.777
Drop corrCentFrac	0.810
Drop EMFraction	0.791
Drop PSSFraction	0.810
Drop isolFrac	0.803
Drop hadLeakEt	0.738
Drop secMaxStripEtOverPt	0.787
Drop TRTHTOverLT	0.712

v05-02 (2012-12-01-16h21m03s)

• 9 or 8 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Still significant over-training.
• Action item: After discussing with SM, merge barrel inner and barrel outer in high pT bin. Restart with 10 input variables, 20 trees.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.846
Drop absdeltaeta	0.831
Drop absdeltaphi	0.836
Drop corrFTrk	0.810
Drop corrCentFrac	0.829
Drop EMFraction	0.813
Drop isolFrac	0.832
Drop hadLeakEt	0.739
Drop secMaxStripEtOverPt	0.795
Drop TRTHTOverLT	0.721

v05-01 (2012-12-01-16h08m50s)

• 10 or 9 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Still significant over-training.
• Action item: Remove PSSFraction, retrain in hope over-training is reduced with fewer input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 10 variables	0.844
Drop absdeltaeta	0.824
Drop absdeltaphi	0.836
Drop corrFTrk	0.805
Drop corrCentFrac	0.820
Drop EMFraction	0.825
Drop PSSFraction	0.846
Drop isolFrac	0.821
Drop hadLeakEt	0.742
Drop secMaxStripEtOverPt	0.799
Drop TRTHTOverLT	0.734

v05-00 (2012-12-01-15h57m23s)

• 10 or 9 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• First training for barrel inner, high pT category.
• No trainings crashed.
• Significant over-training.
• Action item: move to 20 trees, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 10 variables	0.857
Drop absdeltaeta	0.836
Drop absdeltaphi	0.843
Drop corrFTrk	0.809
Drop corrCentFrac	0.836
Drop EMFraction	0.832
Drop PSSFraction	0.849
Drop isolFrac	0.832
Drop hadLeakEt	0.749
Drop secMaxStripEtOverPt	0.811
Drop TRTHTOverLT	0.734

v04-10 (2012-12-01-14h53m28s)

• 8 or 7 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is in increased relative to 10 trees, but still not dramatic.
• Action item: Consult with SM. Move to next kinematic category.

Input variable configuration	Sig eff for bkg @ 0.01
All 8 variables	0.878
Drop absdeltaeta	0.842
Drop absdeltaphi	0.862
Drop corrFTrk	0.825
Drop corrCentFrac	0.860
Drop EMFraction	0.860
Drop hadLeakEt	0.826
Drop secMaxStripEtOverPt	0.824
Drop TRTHTOverLT	0.731

v04-09 (2012-12-01-14h26m53s)

• 9 or 8 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is in increased relative to 10 trees, but still not dramatic.
• Action item: remove PSSFraction, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.883
Drop absdeltaeta	0.848
Drop absdeltaphi	0.870
Drop corrFTrk	0.838
Drop corrCentFrac	0.870
Drop EMFraction	0.873
Drop PSSFraction	0.878
Drop hadLeakEt	0.845
Drop secMaxStripEtOverPt	0.841
Drop TRTHTOverLT	0.740

v04-08 (2012-12-01-13h48m46s)

• 10 or 9 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is in increased relative to 10 trees, but still not dramatic.
• Action item: remove isolFrac, retrain.

Input variable configuration	Sig eff for bkg @ 0.01
All 10 variables	0.886
Drop absdeltaeta	0.855
Drop absdeltaphi	0.873
Drop corrFTrk	0.841
Drop corrCentFrac	0.882
Drop EMFraction	0.875
Drop PSSFraction	0.882
Drop isolFrac	0.883
Drop hadLeakEt	0.894
Drop secMaxStripEtOverPt	0.845
Drop TRTHTOverLT	0.752

v04-07 (2012-12-01-09h31m15s)

• 6 or 5 input variables, 80 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is minor, in all configurations.
• Minor improvement by going to 80 trees. Feels like asymptotically approaching most optimal number of trees to train with.
• Action item: try 10 vars with 40 trees.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.851
Drop absdeltaeta	0.793
Drop corrFTrk	0.798
Drop EMFraction	0.820
Drop hadLeakEt	0.769
Drop secMaxStripEtOverPt	0.788
Drop TRTHTOverLT	0.689

v04-06 (2012-12-01-09h09m14s)

• 6 or 5 input variables, 40 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is minor, in all configurations.
• Some improvement by going to 40 trees, not as dramatic as going from 10-20.
• Action item: Increase number of trees from 40 to 80 to gauge affect.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.847
Drop absdeltaeta	0.789
Drop corrFTrk	0.792
Drop EMFraction	0.815
Drop hadLeakEt	0.765
Drop secMaxStripEtOverPt	0.785
Drop TRTHTOverLT	0.685

v04-05 (2012-12-01-08h50m31s)

• 6 or 5 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is minor, in all configurations.
• Significant improvement by going to 20 trees.
• Action item: Increase number of trees from 20 to 40 to gauge affect.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.840
Drop absdeltaeta	0.781
Drop corrFTrk	0.786
Drop EMFraction	0.806
Drop hadLeakEt	0.754
Drop secMaxStripEtOverPt	0.778
Drop TRTHTOverLT	0.681

v04-04 (2012-12-01-08h29m42s)

• 6 or 5 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• NB: Plots indicate v04-03 but they are v04-04.
• No trainings crashed.
• Over-training is minor, in all configurations.
• No input variable is obvious candidate for removal. This could be a final set.
• Action item: Increase number of trees from 10 to 20 to gauge affect.

Input variable configuration	Sig eff for bkg @ 0.01
All 6 variables	0.816
Drop absdeltaeta	0.764
Drop corrFTrk	0.770
Drop EMFraction	0.785
Drop hadLeakEt	0.734
Drop secMaxStripEtOverPt	0.762
Drop TRTHTOverLT	0.666

v04-03 (2012-12-01-08h11m40s)

• 7 or 6 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is minor, in all configurations.
• Action item: Remove "least valuable" variable (corrCentFrac) and do N-1 trainings with the remaining 6 input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 7 variables	0.837
Drop absdeltaeta	0.797
Drop corrFTrk	0.792
Drop corrCentFrac	0.816
Drop EMFraction	0.815
Drop hadLeakEt	0.775
Drop secMaxStripEtOverPt	0.783
Drop TRTHTOverLT	0.689

v04-02 (2012-12-01-07h50m31s)

• 8 or 7 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• One N-1 training crashed: training without absdeltaeta
• Over-training is minor, in all configurations.
• Action item: Remove "least valuable" variable (absdeltaphi) and do N-1 trainings with the remaining 7 input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 8 variables	0.851
Drop absdeltaeta	N/A
Drop absdeltaphi	0.837
Drop corrFTrk	0.801
Drop corrCentFrac	0.833
Drop EMFraction	0.835
Drop hadLeakEt	0.794
Drop secMaxStripEtOverPt	0.799
Drop TRTHTOverLT	0.702

v04-01 (2012-12-01-07h17m38s)

• 9 or 8 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• No trainings crashed.
• Over-training is minor, in all configurations.
• Action item: Remove "least valuable" variable (PSSFraction) and do N-1 trainings with the remaining 8 input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 9 variables	0.860
Drop absdeltaeta	0.822
Drop absdeltaphi	0.845
Drop corrFTrk	0.810
Drop corrCentFrac	0.844
Drop EMFraction	0.845
Drop PSSFraction	0.851
Drop hadLeakEt	0.815
Drop secMaxStripEtOverPt	0.818
Drop TRTHTOverLT	0.711

v04-00 (2012-12-01-06h13m24s)

• 10 or 9 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• Two N-1 trainings crashed: training without corrFTrk and training without secMaxStripEtoverPt.
• Over-training is minor, in all configurations.
• TRTHT ratio is super important, as expected.
• A number of variables qualify is "less valuable". See table below.
• Action item: Remove "least valuable" variable (isolFrac) and do N-1 trainings with the remaining 9 input variables.

Input variable configuration	Sig eff for bkg @ 0.01
All 10 variables	0.864
Drop absdeltaeta	0.832
Drop absdeltaphi	0.850
Drop corrFTrk	N/A
Drop corrCentFrac	0.858
Drop EMFraction	0.853
Drop PSSFraction	0.859
Drop isolFrac	0.860
Drop hadLeakEt	0.822
Drop secMaxStripEtOverPt	N/A
Drop TRTHTOverLT	0.727

v02-06 (2012-11-30-04h47m20s)

• 5 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• No trainings crash.
• Performance of low pT bin improves without additional over-training. Good!
• Performance of high pT bin improves but with additional over-training. Bad.
• I am now suspicious of secMaxStripEt because I found out it is simply a raw energy, not energy / lead track pT or something like that.
• Action item: Discuss with SM.
• Action follow up: Discussed with SM, settled on 10 variables which should "in principle" be important for training. Will focus on those.

v02-05 (2012-11-30-04h36m22s)

• 4 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• Low pT bin did not crash. This indicates this is at least partly correlated with available statistics.
• Over-training is reduced further, possibly to acceptable levels. I will now focus on improving performance, which has degraded since I reduced the list of input variables.
• Action item: Re-introduce EMFraction.

v02-04 (2012-11-30-04h19m59s)

• 4 input variables, 10 trees.
• Signal scores, background scores, and ROC curves
• pT bin 30-60 GeV bin crashed. It appears there is a threshold between 50 and 20 trees for this configuration for crashing.
• Over-training is significantly reduced, and performance degradation is small. I will stick with 10 trees for now.
• Action item: Merge some pT bins to see if statistics boost helps.

v02-03 (2012-11-30-04h07m51s)

• 4 input variables, 50 trees.
• Signal scores, background scores, and ROC curves
• NB: The plots say v02-02, but these are v02-03. If in doubt, consult the date in the URL.
• pT bin 30-60 GeV did not crash here. Only change was increased number of trees. This behavior is not understood, but hopefully Noel's patches to taumva will help.
• Performance is only slightly improved, at the cost of more significant over-training.
• Action item: Go to 10 trees, keep 4 input variables.

v02-02 (2012-11-30-03h55m42s)

• 4 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• pT bin 30-60 GeV crashed. Not clear why.
• Performance degradation (compared to 7 input variables) is significant.
• Over-training is reduced but still present.
• Action item: Go back to 50 trees, keep 4 input variables.

v02-01 (2012-11-29-13h34m54s)

• 7 input variables, 20 trees.
• Signal scores, background scores, and ROC curves
• Over-training is reduced but still present. Correlated with available statistics?
• Action item: Reduce number of input variables to see if this reduces over-training.

v02-00 (2012-11-29-13h05m27s)

• 7 input variables, 50 trees.
• Signal scores, background scores, and ROC curves
• Over-training persists, especially in high pT bins.
• Action item: Reduce number of trees

v01-00 (2012-11-29-04h46m15s)

• Signal scores, background scores, and ROC curves
• Variables expected to offer minor gains (redundant or not powerful) were removed.
• Two trainings did not converge: pT 60--100 GeV, eta 2.00--3.00 and pT 100+ GeV, eta 2.00--3.00.
• Action item: Reduce variable list even further. Focus on specific kinematic region (inner barrel eta bin 0.00 - 0.80).

v00-00 (2012-11-28-08h22m31s)

• First iteration
• Signal scores, background scores, and ROC curves
• All 15 variables considered in all regions, except secMaxStripEt and TRTHTOverLT_LeadTrk were excluded at high eta because they are unstable/undefined here.
• A handful of trainings did not converge.
• Among converged trainings, over-training is observed everywhere.
• Action item: Reduce variable list significantly in hopes that that trainings will converge and over-training will be reduced. Re-introduce variables one-by-one to judge value.

Meetings

• 04 December 2012 @ Tau WG
• 27 November 2012 @ Tau WG
• 20 November 2012 @ Tau WG

Meetings (previous e-veto)

Indico search for "Harvey Maddocks"

• TauWG: 2012-07-17
• TauWG: 2012-07-10
• TauWG: 2012-06-12
• TauWG: 2012-06-05
• TauWG: 2012-05-22
• TauWG: 2012-05-15
• TauWG: 2012-05-02
• TauWG: 2012-04-17

Links

• ElectronVetoTrain2012 SVN repository in penn/PennTau

-- AlexanderTuna - 27-Nov-2012