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Performance and physics results for Phase1 upgrade. Alessia Tricomi (University and INFN Catania ) o n behalf of the Tracker Upgrade Simulation Group. Performance studies. The g oal for the TDR was to show improvement in Physics cases and robustness of the new design . - PowerPoint PPT Presentation
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Pixel Upgrade Workshop Grindelwald, August 29th 2012
PERFORMANCE AND PHYSICS RESULTS FOR PHASE1 UPGRADE
Alessia Tricomi (University and INFN Catania)on behalf of the Tracker Upgrade Simulation Group
Pixel Upgrade Meeting Alessia Tricomi
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Performance studies The goal for the TDR was to show
improvement in Physics cases and robustness of the new design.
Focus on relative improvement of the upgrade wrt current geometry.
Two complementary approaches: Show improvements in basic building blocks for
physics using a full (Geant) simulation of the upgrade Demonstrate improvements in tracking
efficiency and fake rate Demonstrate improved IP resolution and b-
tagging performance Improvements in relevant physics channels
(under PC responsibility)Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Pixel Upgrade dictionary
Grindelwald, 29/08/12
Current Detector: Current pixel detector geometry (3 barrel layers, 2
disks) Current beam pipe Dedicated “SLHC” release CMSSW_4_2_8_SLHC2 to
use Design/Ideal conditions and same configurations/settings for tracking
Phase1 Upgrade (R30F12) geometry: Upgrade geometry with 4 BPIX layers and 3 endcap
disks First barrel layer at R=30 with 12 faces New detailed material description according to PSI drawings New beampipe (Sunanda) implemented
CMSSW_4_2_8_SLHCtk + 520 backporting
Pixel Upgrade Meeting Alessia Tricomi
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Upgrade Studies Study at
2×1034 cm-2s-1 at 25ns (50ns),<PU>=50 (100) 1×1034 cm-2s-1 at 25 ns,<PU>=25 zero PU
Dynamic data loss (due to pixel ROC) used in simulations
Tracking steps modified for upgrade geometry and high PU Using CMSSW_4_2_8 but with 5_2_0 tracking backported Dropped detached tracking steps (see backup slides)
Used regular CMS DQM validation packages to get tracking and b-tagging performance plots
Fullsim, 14 TeV, ideal conditions, no pixel CPE templates used ttbar from PYTHIA (10K events) Muon gun (10K events-4 muons/event, generated flat in pT
and eta, 200k events-ten muons/event, generated flat in p and eta)
Grindelwald, 29/08/12
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Data loss for Upgrade Studies
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
Peak luminosity valuesCurrent Detector Radius
(cm)% Data loss at 11034 @25ns
% Data loss at 21034 @25ns
% Data loss at 21034 @50ns
BPIX1 4.4 4.0 16 50
BPIX2 7.3 1.5 5.8 18.2
BPIX3 10.2 0.7 3.0 9.3
FPIX1&2 0.7 3.0 9.3
Phase 1 Detector Radius(cm)
% Data loss at 11034 @25ns
% Data loss at 21034 @25ns
% Data loss at 21034 @50ns
BPIX1 3.0 1.19 2.38 4.76
BPIX2 6.8 0.23 0.46 0.93
BPIX3 10.9 0.09 0.18 0.36
BPIX4 16.0 0.04 0.08 0.17
FPIX1-3 0.09 0.18 0.36
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Upgrade Iterative Tracking (Stdgeom)
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
5_2_0 tracking for current pixel geometry (from “2012 tune”) Close to 5_2_0 tracking, use steps 0-2, and 4A (for high eta) Reduce step 4A d0 cut to reduce CPU and memory usageIteration Seeds pT cut
(GeV)d0 cut (cm)
dz cut (cm)
Min hits
0 pixel triplets 0.6 0.02 4.0σbs 3
1 low pT pixel triplets 0.2 0.02 4.0σbs 3
2 pixel pairs with vtx 0.6 0.015 4.0σbs 3
3 detached triplets 0.3 1.5 15.0 3
4A pixel +(TEC(1 ring)) triplets
0.4 0.02 10.0 3
4B BPIX+TIB triplets 0.6 1.5 10.0 3
5 TIB, TID, TEC pairs (fewer)
0.7 2.0 10.0 4
6 TOB, TEC pairs 0.6 6.0 30.0 6
Release CMSSW_4_2_8_SLHCstd2_patch1 Tracking steps
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Upgrade Iterative Tracking (Phase 1)
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
5_2_0 tracking for Phase 1 geometry (not optimized) Make close to 5_2_0 tracking, use steps 0-2, and 4A, add step “-1” Step 3 (pixel pairs) to recover efficiency in eta ~1.2–1.4 regionIteration Seeds pT cut
(GeV)d0 cut (cm)
dz cut (cm)
Min hits
0 pixel quadruplets 0.6 0.02 4.0σbs 3
1 pixel triplets 0.6 0.02 4.0σbs 3
2 low pT pixel triplets 0.2 0.02 4.0σbs 3
3 pixel pairs with vtx 0.6 0.015 4.0σbs 3
3old detached triplets 0.3 1.5 15.0 3
4A pixel +(TEC(1 ring)) triplets
0.4 0.02 10.0 3
4B BPIX+TIB triplets 0.6 1.5 10.0 3
5 TIB, TID, TEC pairs (fewer)
0.7 2.0 10.0 4
6 TOB, TEC pairs 0.6 6.0 30.0 6
Release CMSSW_4_2_8_SLHCtk3_patch1 Tracking steps
Pixel Upgrade Meeting Alessia Tricomi
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Pixel Upgrade Material Budget Reduced material even with more layers
“Volumes” Mass (g)Current Design Upgrade
BPIX <2.16 16801 6618FPIX <2.50 8582 7024
Rad. Len. Nucl. Int. Len.
Dots – UpgradeGreen – Curr geom
Pixels Pixels
Grindelwald, 29/08/12
50% less photon conversion in/before pixel at eta 1.5
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Pixel Upgrade Meeting Alessia Tricomi
Transverse and Longitudinal IPPrimary VertexTrackingBtaggingRobustness
Object performance
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
Impact Parameter Resolutions
10 Transverse: muon sample (10 muons/event), zero
pileup Generated flat in E and eta (plot vs absolute p and in 4
eta regions) Compare current and upgrade detectors (modified MTV)
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Impact Parameter Resolutions
Longitudinal: muon sample (10 muons/event), zero pileup Generated flat in E and eta (plot vs absolute p and in 4 eta regions) Compare current and upgrade detectors
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Impact Parameter Resolutions Transverse: muon sample (10 muons/event), <PU>=50
Generated flat in E and eta (plot vs absolute p and in 4 eta regions) Compare current and upgrade detectors
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Impact Parameter Resolutions Longitudinal: muon sample (10 muons/event), <PU>=50
Generated flat in E and eta (plot vs absolute p and in 4 eta regions) Compare current and upgrade detectors
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Primary Vertex Resolution
ttbar sample, zero PU and <PU>=50
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
Tracking in ttbar15
ttbar sample, High purity pT > 0.9 GeV/c
Grindelwald, 29/08/12
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Tracking with muons
Muon sample High purity pT>1 GeV/c num tracking
layers with hits >= 8
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Tracking Efficiency/Fake Rate ttbar sample, compare current and upgrade detectors
High purity, pT > 0.9 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Tracking vs PU Average tracking efficiencies vs PU
ttbar, high purity tracks, pT > 0.9 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Tracking vs PU Average track fake rates vs PU
ttbar, high purity tracks, pT > 0.9 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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B-tagging Performance ttbar, CSV tagger, compare current and upgrade
ak5PFjets PFnoPU, jet pT > 30 GeV, DUS ,c,b jets
15% absolute gain in b jet efficiency for 1% fake rate
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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B-tagging Performance ttbar, CSV tagger, compare current and upgrade, <PU>=100
ak5PFjets PFnoPU, jet pT > 30 GeV, DUS ,c,b jets
Improvement even more impressive at 100 PU
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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B tagging performance
Grindelwald, 29/08/12
Upgrade as good or better at high pileup as current at low pileup
Upgrade PU50Current PU0
Upgrade PU50Current PU25
Pixel Upgrade Meeting Alessia Tricomi
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B-tagging Performance vs PU
ttbar, CSV tagger, compare current and upgrade, <PU>=50 ak5PFjets PFnoPU, jet pT > 30 GeV, DUS,b jets
Much better handling high Pile-UpGrindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Robustness: BPIX1 Inefficiency Study
Vary inefficiency of BPIX layer 1: 0%, 5%, 10%, 20% All other layers at 100% ttbar, <PU>=50, light quark mis-tag=1% Upgrade detector more robust to BPIX1 inefficiency
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Robustness: BPIX1 Inefficiency Study
Vary inefficiency of BPIX layer 1: 0%, 5%, 10%, 20% All other layers at 100% ttbar, <PU>=50, high purity tracks, pT>0.9 GeV/c Upgrade detector more robust to BPIX1
inefficiency
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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TIB Inefficiency Study Switch off certain modules (in black below)
List provided by Frank Hartmann
Or consider a uniform 20% inefficiency in TIB1,2 Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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Robustness to TIB degradation
Grindelwald, 29/08/12
With Dead Modules
With 20% uniform inefficiency in TIB1,2
Upgrade detector more robust wrt TIB loss
Pixel Upgrade Meeting Alessia Tricomi
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Small pixel scenario: tracking with ttbar at 100PU
Grindelwald, 29/08/12
BPIX Layer1: pixel size 75x100 mm2, 220 mm thicknessROC threshold 1200 e- instead of 2000
Significant improvement at 100 PU wrt Upgrade Phase1 detectorGood news towards Phase2
Pixel Upgrade Meeting Alessia Tricomi
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Small pixel scenario: btagging performance
Grindelwald, 29/08/12
BPIX Layer1: pixel size 75x100 mm2, 220 mm thicknessROC threshold 1200 e- instead of 2000No data loss
Significant improvement at 100 PU wrt Upgrade Phase1 detectorGood news towards Phase2
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Pixel Upgrade Meeting Alessia Tricomi
ZHllbbHZZ4lSUSY MT2
SUSY gg+METAll analysis show relative improvement and have not been optimized/retuned for high PU
Physics Performance
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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ZHllbb
Grindelwald, 29/08/12
Analysis based on:1. triggering on lepton events;2. kinematic reconstruction of Z from isolated dileptons;3. reconstructing invariant mass from two b-tagged jets;4. multivariate final variable
Higher muon/electron ID efficiency helps with (1-2), better b-tagging helps with (3-4)
Compare relative performance of current detector and upgrade at 14 TeV with 50 pileup events
Pixel Upgrade Meeting Alessia Tricomi
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ZHmmbb event selection
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
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ZHmmbb cut flow
Grindelwald, 29/08/12
Values greater than 1 show increased efficiency for the Phase1 upgrade and vice versa
Pixel Upgrade Meeting Alessia Tricomi
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ZHeebb event selection
Grindelwald, 29/08/12
Same selection as for muons but Electrons use 95% working-point of VBTF Isolation is relaxed as in the di-muon
analysis Dimuon mass ~2 GeV high, so Z mass
cut increased by +2 GeV like in dimuon analysis
Other criteria same as for di-muon channel
Pixel Upgrade Meeting Alessia Tricomi
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ZHeebb cut flow
Grindelwald, 29/08/12
Values greater than 1 show increased efficiency for the Phase1 upgrade and vice versa
Pixel Upgrade Meeting Alessia Tricomi
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ZHllbb results
Grindelwald, 29/08/12
ZHmmbb 65% relative gain in signal efficiency for di-muon
channel 75% gain with single muon HLT 175% gain with dimuon HLT (upgrade detector
barely affected by the three pixel hit requirement) ZHeebb
65% relative gain in signal efficiency for di-electron channel
Not enough MC to properly estimate total reductions in backgrounds
Pixel Upgrade Meeting Alessia Tricomi
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HZZ4l
Grindelwald, 29/08/12
Analysis based on: 1. triggering on di-lepton events;2. kinematic reconstruction of 2 Zs from isolated
di-leptons;3. reconstructing invariant mass of Higgs
Higher muon/electron ID efficiency helps with (1-2)
Compare relative performance of current detector and upgrade at 14 TeV with 50 pileup events
Pixel Upgrade Meeting Alessia Tricomi
38
HZZ4l event selection
Grindelwald, 29/08/12
Using same cuts as in 2012 analysis (HIG-12-016) PF leptons used Electrons pT > 7 GeV, |η|<2.5; Muons pT > 5 GeV, |η| <
2.4 Isolation relaxed from 0.15 to 5.0 |SIP3D|<4 for each lepton 40 < mZ1<120 GeV; 12 < mZ2<120 GeV; ml+l->4GeV m4l > 100 GeV same HLT estimate as in ZH: 3+ pixel hits on trigger
leptons
Pixel Upgrade Meeting Alessia Tricomi
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HZZ4m cut flow
Grindelwald, 29/08/12
Values greater than 1 show increased efficiency for the Phase1 upgrade and vice versa
40% gain in 4m channel
Pixel Upgrade Meeting Alessia Tricomi
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HZZ4e cut flow
Grindelwald, 29/08/12
Values greater than 1 show increased efficiency for the Phase1 upgrade and vice versa
50% gain in 4e channel
Pixel Upgrade Meeting Alessia Tricomi
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HZZ2e2m cut flow
Grindelwald, 29/08/12
Values greater than 1 show increased efficiency for the Phase1 upgrade and vice versa
48% gain in 2e2m channel
Pixel Upgrade Meeting Alessia Tricomi
42
SUSY MT2b analysis
Grindelwald, 29/08/12
Fully hadronic final states with large MET B jets coming from cascade decay of gluino and squark
to third generation sbottom, stop SUSY particles identified through the discovery
parameter MT2 Tail of Supersimmetric Transverse Mass related to parent
sparticle mass (endpoint) Compare relative performance of current detector
and upgrade at 14 TeV with 50 pileup events wrt to btagging improvement Signal: LM9 benchmark point Bkg: ttbar
See AN-2012/275 for details
Pixel Upgrade Meeting Alessia Tricomi
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SUSY MT2b event selection
Grindelwald, 29/08/12
Good primary vertes Veto electrons: pT>10 GeV/c; |η|<2.4; |d0|
<0.04cm; |dz|<1.0cm; missing inner hits<2; PFIso<2.0
Veto muons: pT>10 GeV/c; |η|<2.4; |d0|<0.04cm; |dz|<1.0cm; Trk hits>10; Pix hits>0; PFIso<2.0
Jets: 2 PF jets with pT> 20 GeV/c passing loose JetID; veto events with jets pT>50 GeV/c but failing jet ID
MET: PFMET>30GeV;PFH >750GeV
B-tag: Tight CSV tag > 0.898
Pixel Upgrade Meeting Alessia Tricomi
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SUSY MT2b analysis
Grindelwald, 29/08/12
Before any b-tagging One b-jet required
20% higher signal selection efficiency can be obtained without any real optimization for the new detector and high pile-up.
Pixel Upgrade Meeting Alessia Tricomi
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SUSY gg+MET analysis
Grindelwald, 29/08/12
Di-photon events+MET signature for SUSY
No significant SM bkg, small contribution from Vgg
Main bkg comes from fake MET See AN-2012/269 Same 14 TeV, 50 pileup scenario as
others Main improvement comes from fake rate
reduction
Pixel Upgrade Meeting Alessia Tricomi
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SUSY gg+MET analysis
Grindelwald, 29/08/12
Events divided in four classes: gg, ge, ee, fake-fake
ge and ee samples used to estimate fake rate by fitting Z peak
Pixel Upgrade Meeting Alessia Tricomi
47
SUSY gg+MET analysis
Grindelwald, 29/08/12
Fake rate 7.0% for the current detector and 1.25% for Phase1 pixel detectors
Fake rate with the upgrade detector at 50 PU is comparable with the performance of the current detector in low luminosity run
Pixel Upgrade Meeting Alessia Tricomi
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Conclusions
Grindelwald, 29/08/12
All results show that the new detector at high PU performs as well or even better than the current detector at low luminosity
The results also show that the new detector is fairly robust against possible inefficiency in BPIX1 and TIB1,2
All the results have been approved by Tracking/btagging/Physics group – PAS SUS-12-020
Improvements from the new design are broad and substantial and will have a significant impact our physics program
Still a lot of work to be done to tune algorithms and analysis for high PU scenario Stay tuned!
49
Pixel Upgrade Meeting Alessia Tricomi
Back-up slides
Grindelwald, 29/08/12
50
Tracking for Upgrade Studies
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
Use 4_2_8 but with 5_2_0 tracking, and drop detached trks Fullsim, 14 TeV, ideal conditions, no pixel templates Regular CMS validation package, current and upgrade pixel detIteration Seeds pT cut
(GeV)d0 cut (cm)
dz cut (cm)
Min hits
0 pixel triplets 0.6 0.02 4.0σbs 3
1 low pT pixel triplets 0.2 0.02 4.0σbs 3
2 pixel pairs with vtx 0.6 0.015 4.0σbs 3
3 detached triplets 0.3 1.5 15.0 3
4A pixel +(TEC(1 ring)) triplets
0.4 1.5 10.0 3
4B BPIX+TIB triplets 0.6 1.5 10.0 3
5 TIB, TID, TEC pairs (fewer)
0.7 2.0 10.0 4
6 TOB, TEC pairs 0.6 6.0 30.0 6
Regular 5_2_0 Tracking steps
Pixel Upgrade Meeting Alessia Tricomi
51
Impact Parameter Resolutions
Transverse: muon sample (10 muons/event), zero pileup Generated flat in E and eta (plot vs absolute p and in 4 eta regions) Compare with/without (50PU) dynamic data loss for current detector
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
52
Impact Parameter Resolutions
Longitudinal: muon sample (10 muons/event), zero pileup Generated flat in E and eta (plot vs absolute p and in 4 eta regions) Compare with/without (50PU) dynamic data loss for current detector
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
53
Primary Vertex Resolution
ttbar sample, zero PU and <PU>=50 Compare with/without (50PU) dynamic data
loss for current detector
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
54
Tracking Efficiency and Fake Rates
Average tracking efficiencies, high purity, pT>0.9 GeV
Sample Stdgeom Efficiency (%)
Phase 1 Efficiency (%)
Mu PU0 pt0.9,8hit 97.4 ± 0.1 98.1 ± 0.1Mu PU0 pt0.9,8hit, dloss 93.9 ± 0.1 97.9 ± 0.1Mu PU50 pt0.9,8hit 90.1 ± 0.2 94.9 ± 0.1Mu PU50 pt0.9,8hit, dloss
81.5 ± 0.2 94.4 ± 0.1
ttbar PU0 pt0.9 89.6 ± 0.1 93.5 ± 0.1ttbar PU0 pt0.9, dloss 85.6 ± 0.1 93.2 ± 0.1ttbar PU50 pt0.9 84.9 ± 0.1 92.2 ± 0.1ttbar PU50 pt0.9, dloss 79.7 ± 0.1 92.0 ± 0.1Grindelwald,
29/08/12
Pixel Upgrade Meeting Alessia Tricomi
Tracking Efficiency & Fake rate55
Using Standard validation packages: MultiTrackValidator
Tracking efficiency = #sim trks assoc. to reco trk #sim trks
(for signal sim tracks only)
Tracking fake rate = #reco trks not assoc. to sim trk#reco trks
(for “all” reco tracks)
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
56
Tracking Efficiency/Fake Rate ttbar sample, current detector
generalTracks, pT > 0.1 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
57
Tracking Efficiency/Fake Rate ttbar sample, upgrade pixel detector detector
generalTracks, pT > 0.1 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
58
Tracking Efficiency/Fake Rate ttbar sample, compare current and upgrade detectors
generalTracks, pT > 0.1 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
59
B-tagging Performance (BPIX1 Study)
ttbar, CSV tagger, current detector, <PU>=50, compare BPIX1 ak5PFjets PFnoPU, jet pT > 30 GeV, DUS,b jets
All other layers are at
100% efficiency
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
60
B-tagging Performance (BPIX1 Study)
ttbar, CSV tagger, upgrade detector, <PU>=50, compare BPIX1 ak5PFjets PFnoPU, jet pT > 30 GeV, DUS,b jets
All other layers are at
100% efficiency
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
61
Outer Tracker Inefficiency Study
Uniform 20% inefficiency in TIB1,2: zero PU and <PU>=50 ttbar sample, high purity tracks, pT>0.9 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
62
Outer Tracker Inefficiency Study
Uniform 20% inefficiency in TIB1,2: zero PU and <PU>=50 ttbar sample, high purity tracks, pT>0.9 GeV/c Upgrade detector more robust to Outer Tracker inefficiency
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
63
Outer Tracker Inefficiency Study
Dead Modules in Outer Tracker: zero PU and <PU>=50 ttbar sample, high purity tracks, pT>0.9 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
64
Outer Tracker Inefficiency Study
Dead Modules in Outer Tracker: zero PU and <PU>=50 ttbar sample, high purity tracks, pT>0.9 GeV/c
Grindelwald, 29/08/12
Pixel Upgrade Meeting Alessia Tricomi
65
HZZ4l analysis
Grindelwald, 29/08/12
Isolation
Pixel Upgrade Meeting Alessia Tricomi
66
HZbbll
Grindelwald, 29/08/12
Di-lepton requirement
Pixel Upgrade Meeting Alessia Tricomi
67
HZZ4l analysis
Grindelwald, 29/08/12
More pixel hits for muon tracks
Pixel Upgrade Meeting Alessia Tricomi
68
HZZ4l analysis
Grindelwald, 29/08/12
Better IP
Pixel Upgrade Meeting Alessia Tricomi
69
HZZ4l analysis
Grindelwald, 29/08/12
Better Z mass resolution
Pixel Upgrade Meeting Alessia Tricomi
70
SUSY MT2 analysis
Grindelwald, 29/08/12