[PPT] - Simulation of CMS Phase 2 Pixel Tracker for HL-LHC Bahareh PowerPoint Presentation

SLIDE 1

Simulation of CMS Phase 2 Pixel Tracker for HL-LHC

Bahareh Roozbahani

USCMS FPIX Simulation Group

June 18, 2018

FERMILAB-SLIDES-18-069-CMS This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

SLIDE 2

Introduction

◮ CMS pixel detector is a unique tracking detector

→ All-silicon technology → Key element in efficient and precise reconstruction of tracks/interaction vertices and heavy flavor tagging

◮ Tracker is the closest to the beam-line →

Difficult environment

→ High instantaneous luminosity (∼ 1034cm−2s−1) → Large number of pp interactions per bunch- crossing (pileup) → Expecting increase in instantaneous luminosity, pileup up to 140 to 200 at HL-LHC

H→ZZ→ eeµµ event above, overlaid with 20 pileup interactions

ROC high rates Accumulated radiation Damage Decreased in charge collection/sharing Worsen efficiency and resolution

New Perspectives 2018 June 18, 2018 1/10

SLIDE 3

CMS Pixel Detector Upgrade

Phase0 → Phase1

◮ Added extra barrel layer and endcap disk ◮ Layers closer to the beam-line

→ improvement in tracking and b-tagging

◮ Barrel: 48M → 79M pixels

Forward: 18M → 45M pixels

◮ Moved from analog to digital readout

Phase1 pixel detector installation Phase2 pixel detector installation

13

New Perspectives 2018 June 18, 2018 2/10

SLIDE 4

CMS Pixel Detector Phase2 Upgrade

◮ Inner Tracker (Pixel Detector):

→ Same number of Barrel layers (4) as the current detector → Increase the endcap disks to 12 disks → Increasing granularity/smaller pixels (x6 smaller pixel area) Better η coverage → |η| < 4.0 Improved tracking/vertexing Better mitigation of pileup Improved resolution Maintain low digi occupancy

New Perspectives 2018 June 18, 2018 3/10

SLIDE 5

Simulation and Digitization

◮ 1) Simulation of the detector geometry using tkLayout

→ geometry A: 4 barrel layer, 12 endcap disks 25x100x150 µm3 pixels → geometry B: 4 barrel layer, 12 endcap disks 50x50x150 µm3 pixels

◮ 2) Simulation of desired physics processes using

particle gun (Pythia8) and Detector response (Geant4)

→ Ten Muon process with 200 pileup overlaid, simulated in geometry A and geometry B → Output is a collection of simulated hits

◮ 3) Digitization (CMSSW)

→ Convert simulated hits to format similar to experimental raw data (digis)

New Perspectives 2018 June 18, 2018 4/10

SLIDE 6

Occupancy Study

25x100 µm2 pixels 50x50 µm2 pixels Digi Occupancy vs. η Digi Charge in Barrel Digi Charge in Endcap

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0005 0.001 0.0015 0.002 0.0025 0.003

Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Disc_1 Disc_4 Disc_8 Disc_12 CMS Simulation (14 TeV)

2

m µ 25x100 Charge of Digis

5 10 15 20 25 1000 2000 3000 4000 5000 6000

3

10 ×

Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 CMS Simulation (14 TeV) Barrel

2

m µ 25x100 Charge of Digis

5 10 15 20 25 500 1000 1500 2000 2500 3000

3

10 ×

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1

2

m µ 25x100 η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 0.004

Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Disc_1 Disc_4 Disc_8 Disc_12 CMS Simulation (14 TeV)

2

m µ 50x50 Charge of Digis

5 10 15 20 25 1000 2000 3000 4000 5000 6000 7000

3

10 ×

Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 Layer_1 Layer_2 Layer_3 Layer_4 CMS Simulation (14 TeV) Barrel

2

m µ 50x50 Charge of Digis

5 10 15 20 25 500 1000 1500 2000 2500 3000

3

10 ×

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2

m µ 50x50

◮ Higher digi occupancy in the barrel for 50x50 µm2 comparing to 25x100 µm2 ◮ Larger charge collection in 50x50 µm2 in the barrel, similar deposition in endcap

New Perspectives 2018 June 18, 2018 5/10

SLIDE 7

Track Reconstruction

◮ step 1) Local Reconstruction

→ Clustering adjacent pixel digis that are above certain threshold with 2 dimensional matrix algorithm → Inputing clustered digis in a position estimator algorithm that take into account Lorentz drift to produce point measurements (RecHits)

◮ step 2) Track Reconstruction

→ Inputs are RecHits → combinatory track finder (CTF) algorithm, combines reconstructed hits into tracks iteratively

New Perspectives 2018 June 18, 2018 6/10

SLIDE 8

Track transverse impact parameter (dxy) Resolution

0.0 < η < 0.4 2.5 < η < 3.0

TP xy

d

Reco xy

d 0.02 − 0.015 − 0.01 − 0.005 − 0.005 0.01 0.015 0.02

3 −

10

2 −

10

1 −

10 1

25x100 50x50 CMSSimulation (14 TeV) (GeV) < 50

T

p ≤ 10 < 0.4 η 0.0 <

0.00000 ± RMS = 0.00089 0.00001 ± RMS = 0.00103

)(cm)

xy

(d σ

0.005 0.01 0.015 0.02 0.025 0.03 25x100 50x50

CMS Simulation

(14 TeV) <0.4 η 0.0<

(GeV)

T

p

20 40 60 80 100 120

50x50/25x100 0.5 1 1.5

25x100 50x50

TP xy

d

Reco xy

d 0.02 − 0.015 − 0.01 − 0.005 − 0.005 0.01 0.015 0.02

3 −

10

2 −

10

1 −

10 1

25x100 50x50 CMSSimulation (14 TeV) (GeV) < 50

T

p ≤ 10 < 3.0 η 2.5 <

0.00000 ± RMS = 0.00145 0.00000 ± RMS = 0.00186

)(cm)

xy

(d σ

0.005 0.01 0.015 0.02 0.025 0.03 25x100 50x50

CMS Simulation

(14 TeV) <3.0 η 2.5<

(GeV)

T

p

20 40 60 80 100 120

50x50/25x100 0.5 1 1.5

25x100 50x50

◮ dxy Resolution is worse in 50x50 µm2 geometry, particularly at high pT

New Perspectives 2018 June 18, 2018 7/10

SLIDE 9

Track longitudal impact parameter (dz) Resolution

0.0 < η < 0.4 2.5 < η < 3.0

TP z

d

Reco z

d 0.06 − 0.04 − 0.02 − 0.02 0.04 0.06

3 −

10

2 −

10

1 −

10 1

25x100 50x50 CMSSimulation (14 TeV) (GeV) < 50

T

p ≤ 10 < 0.4 η 0.0 <

0.00001 ± RMS = 0.00228 0.00001 ± RMS = 0.00121

)(cm)

z

(d σ

0.005 0.01 0.015 0.02 0.025 0.03 25x100 50x50

CMS Simulation

(14 TeV) <0.4 η 0.0<

(GeV)

T

p

20 40 60 80 100 120

50x50/25x100 0.5 1 1.5

25x100 50x50

TP z

d

Reco z

d 0.06 − 0.04 − 0.02 − 0.02 0.04 0.06

3 −

10

2 −

10

1 −

10

25x100 50x50 CMSSimulation (14 TeV) (GeV) < 50

T

p ≤ 10 < 3.0 η 2.5 <

0.00003 ± RMS = 0.01156 0.00002 ± RMS = 0.00898

)(cm)

z

(d σ

0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 25x100 50x50

CMS Simulation

(14 TeV) <3.0 η 2.5<

(GeV)

T

p

20 40 60 80 100 120

50x50/25x100 0.5 1 1.5

25x100 50x50

◮ dz Resolution is better in 50x50 µm2 geometry, specially for higher pT

tracking particles

New Perspectives 2018 June 18, 2018 8/10

SLIDE 10

Track pT Resolution

0.0 < η < 0.4 2.5 < η < 3.0

TP T

p

TP T

p

Reco T

p 0.15 − 0.1 − 0.05 − 0.05 0.1 0.15

3 −

10

2 −

10

1 −

10 1

25x100 50x50 CMSSimulation (14 TeV) (GeV) < 50

T

p ≤ 10 < 0.4 η 0.0 <

0.00004 ± RMS = 0.00723 0.00004 ± RMS = 0.00714

)

T

/p

T

p δ ( σ

0.005 0.01 0.015 0.02 0.025 0.03 25x100 50x50

CMS Simulation

(14 TeV) <0.4 η 0.0<

(GeV)

T

p

20 40 60 80 100 120

50x50/25x100 0.5 1 1.5

25x100 50x50

TP T

p

TP T

p

Reco T

p 0.15 − 0.1 − 0.05 − 0.05 0.1 0.15

3 −

10

2 −

10

1 −

10

25x100 50x50 CMSSimulation (14 TeV) (GeV) < 50

T

p ≤ 10 < 3.0 η 2.5 <

0.00008 ± RMS = 0.03460 0.00008 ± RMS = 0.03639

)

T

/p

T

p δ ( σ

0.01 0.02 0.03 0.04 0.05 0.06 25x100 50x50

CMS Simulation

(14 TeV) <3.0 η 2.5<

(GeV)

T

p

20 40 60 80 100 120

50x50/25x100 0.5 1 1.5

25x100 50x50

◮ dpT Resolution is similar for 25x100 µm2 and 50x50 µm2 geometry, slightly

worsen for higher pT in 50x50 µm2

New Perspectives 2018 June 18, 2018 9/10

SLIDE 11

Summary

◮ We have studied the pixel detector performance for 2 scenarios:

→ 25x100 µm2 pixel size → 50x50 µm2 pixel size

◮ Digi occupancy is somewhat higher in barrel for 50x50 µm2 ◮ Larger charge collection in 50x50 µm2 comparing to 25x100 µm2 ◮ dxy resolutions are worse for 50x50 µm2 in most η bins ◮ dz resolutions are better for 50x50 µm2 in most η bins ◮ pT resolutions are are similar for 50x50 µm2 and 25x100 µm2

at lowpT, but becomes worse for 50x50 µm2 at pT > 100 GeV.

New Perspectives 2018 June 18, 2018 10/10

SLIDE 12

Backup Slides

New Perspectives 2018 June 18, 2018 11/10

SLIDE 13

Digi Rates in Endcap (FPIX1: Disks 1-4)

25x100 µm pixels 25x100 µm pixels Digi Occupancy Digi Occupancy vs. η Digi Charge

Digi Occupancy

0.001 0.002 0.003 0.004 0.005 0.006 0.007

1 −

10 1 10

2

10

3

10

4

10

5

10

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 25x100 module η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0002 0.0004 0.0006 0.0008 0.001

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 25x100 module Charge of Digis

5 10 15 20 25 30 35 40 45 50 500 1000 1500 2000 2500 3000

3

10 ×

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 25x100 module Digi Occupancy

0.001 0.002 0.003 0.004 0.005 0.006 0.007

1 −

10 1 10

2

10

3

10

4

10

5

10

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 50x50 module η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0002 0.0004 0.0006 0.0008 0.001

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 50x50 module Charge of Digis

5 10 15 20 25 30 35 40 45 50 500 1000 1500 2000 2500 3000

3

10 ×

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New Perspectives 2018 June 18, 2018 12/10

SLIDE 14

Digi Rates in Endcap (FPIX1: Disks 1-4)

25x100 µm pixels 25x100 µm pixels Digi Occupancy Digi Occupancy vs. η Digi Charge

Digi Occupancy

0.001 0.002 0.003 0.004 0.005 0.006 0.007

1 −

10 1 10

2

10

3

10

4

10

5

10

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 25x100 module η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0002 0.0004 0.0006 0.0008 0.001

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 25x100 module Charge of Digis

5 10 15 20 25 30 35 40 45 50 500 1000 1500 2000 2500 3000

3

10 ×

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 25x100 module Digi Occupancy

0.001 0.002 0.003 0.004 0.005 0.006 0.007

1 −

10 1 10

2

10

3

10

4

10

5

10

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 50x50 module η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0002 0.0004 0.0006 0.0008 0.001

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 50x50 module Charge of Digis

5 10 15 20 25 30 35 40 45 50 500 1000 1500 2000 2500 3000

3

10 ×

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX1 50x50 module

New Perspectives 2018 June 18, 2018 13/10

SLIDE 15

Digi Rates in Endcap (FPIX2: Disks 1-4)

25x100 µm pixels 25x100 µm pixels Digi Occupancy Digi Occupancy vs. η Digi Charge

Digi Occupancy

0.001 0.002 0.003 0.004 0.005 0.006 0.007

1 −

10 1 10

2

10

3

10

4

10

5

10

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX2 25x100 module η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0002 0.0004 0.0006 0.0008 0.001

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX2 25x100 module Charge of Digis

5 10 15 20 25 30 35 40 45 50 500 1000 1500 2000 2500 3000

3

10 ×

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX2 25x100 module Digi Occupancy

0.001 0.002 0.003 0.004 0.005 0.006 0.007

1 −

10 1 10

2

10

3

10

4

10

5

10

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX2 50x50 module η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

Digi Occupancy

0.0002 0.0004 0.0006 0.0008 0.001

Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 Disc_1 Disc_2 Disc_3 Disc_4 CMS Simulation (14 TeV) FPIX2 50x50 module Charge of Digis

5 10 15 20 25 30 35 40 45 50 500 1000 1500 2000 2500 3000

3

10 ×

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New Perspectives 2018 June 18, 2018 14/10

SLIDE 16

dxy Resolution vs. η

25x100 25x100 (template CPE) 50x50

(cm))

xy

d δ ( σ 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 1

T

p ≤

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

xy

d δ ( σ 0.002 0.004 0.006 0.008 0.01 0.012 0.014 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 5

T

p ≤ 1

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

xy

d δ ( σ 0.002 0.004 0.006 0.008 0.01 0.012 0.014 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 10

T

p ≤ 5

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

xy

d δ ( σ 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 0.004 0.0045 0.005 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 50

T

p ≤ 10

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

xy

d δ ( σ 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 0.004 0.0045 0.005 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 100

T

p ≤ 50

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

xy

d δ ( σ 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 0.004 0.0045 0.005 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

100 ≥ (GeV)

T

p

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

◮

dxy Resolution is worse in 50x50 geometry, particularly at high pT .

◮

dxy Resolution is slightly worse for 25x100 with template CPEs comparing to 25x100 with generic CPEs.

New Perspectives 2018 June 18, 2018 15/10

SLIDE 17

dz Resolution vs. η

25x100 25x100 (template CPE) 50x50

(cm))

z

d δ ( σ 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 1

T

p ≤

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

z

d δ ( σ 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 5

T

p ≤ 1

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

z

d δ ( σ 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 10

T

p ≤ 5

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

z

d δ ( σ 0.005 0.01 0.015 0.02 0.025 0.03 0.035 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 50

T

p ≤ 10

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

z

d δ ( σ 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

(GeV) < 100

T

p ≤ 50

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

(cm))

z

d δ ( σ 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 25x100 25x100(temp CPE) 50x50

CMS Simulation (14 TeV)

100 ≥ (GeV)

T

p

η

5 − 4 − 3 − 2 − 1 − 1 2 3 4 5

50x50/25x100 0.5 1 1.5 2

25x100 50x50 25x100 temp CPE 50x50

◮

dz Resolution is better in 50x50 geometry, specially for higher pT tracking particles.

◮

dz Resolution is similar for 25x100 with template CPEs comparing to 25x100 with generic CPEs.

New Perspectives 2018 June 18, 2018 16/10