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Strips Occupancies Studies
Alan Taylor
1
Introduction
•
Previously showed strips occupancies for the Inclined Barrel 4.0 layout
using a minimum bias sample.
•
These studies were inconsistent (~factor of 5) different with the LoI layout
results shown previously.
•
It was suggested that the sample I was looking at only had clusters
associated with tracks rather than all clusters in the event. This was the
case.
•
Analysis performed using InDetUpgradePerformanceAnalysis package.
This package is written for D3PDs. I have started to rewrite some of it for
xAOD and for the new geometries.
•
Results are scaled to <mu> = 200.
•
Use phi asymmetry and refer to modules with etaModuleID
Min bias sample
Previously used sample mc15_14TeV.
•
119995.Pythia8_A2MSTW2008LO_minbias_inelastic_low.recon.DAOD_IDTRKVALID.e1133_s
2846_s2850_r7878 — Inclined Barrel 4.0, Min bias <mu> = 0. Step 1.0.
•
The DAOD_IDTRKVALID format only stores hits associated to tracks and
not all hits. Uses InDetDxAOD.py —> ThinHitsOnTrack() function.
•
Produced 10k private sample using the RDO that was used to produce the
sample I was using previously.
•
Add flags:
InDetDxAODFlags.ThinHitsOnTrack.set_Value_and_Lock(False);InDetDxAODFlags.ThinTrack
Selection.set_Value_and_Lock(\”InDetTrackParticles.pt > 0.0*GeV\")"
Check against D3PD
•
D3PD MC events used previously: root://eosatlas//eos/atlas/atlascerngroupdisk/det-slhc/group.detslhc.mc12_14TeV.119995.Pythia8_A2MSTW2008LO_minbias_inelastic_low.ESD.D3PD.
010300.clus.v3.121118122427_EXT2/group.det-slhc.160522_001749.EXT2._00001.D3PD.root
h_nClusters
Entries
1000
Mean
412.5
RMS
286.4
80
70
Entries / 20
Number of SCT clusters in each event is shown below. Top left (D3PD), top right (xAOD,
thinned) and bottom (xAOD, Unthinned)
h_nSCTClusters
Entries
5000
Mean
74.1
RMS
96.03
1800
1600
1400
60
1200
50
1000
40
800
600
30
400
20
200
10
0
0
0
0
100
200
300
400
500
600
700
Entries / 20
Entries / 20
•
800
450
100 200 300 400 500 600 700 800 900 1000
900
1000
nClusters
Number of SCT Clusters in event
h_nSCTClusters
Entries
5000
Mean
362.6
RMS
271.1
400
350
300
250
200
150
100
50
0
0
100 200 300 400 500 600 700 800 900 1000
Number of SCT Clusters in event
Check against D3PD
•
D3PD MC events used previously: root://eosatlas//eos/atlas/atlascerngroupdisk/det-slhc/group.detslhc.mc12_14TeV.119995.Pythia8_A2MSTW2008LO_minbias_inelastic_low.ESD.D3PD.
010300.clus.v3.121118122427_EXT2/group.det-slhc.160522_001749.EXT2._00001.D3PD.root
Number of SCT hits (using cluster size) in each event is shown below. Top left (D3PD), top
right (xAOD, thinned) and bottom (xAOD, Unthinned)
h_nSCTHits
Entries
1000
Mean
1596
RMS
1293
100
80
Entries / 100
# number of SCT hits
h_nSCTHits
Entries
5000
Mean
129.1
RMS
205.3
3500
3000
2500
2000
60
1500
40
1000
500
20
0
0
0
0
500
1000
1500
2000
2500
3000
Entries / 100
Entries / 100
•
3500
500
4000
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
4500
5000
number of hits
Number of SCT Hits in event
h_nSCTHits
Entries
5000
Mean
1262
RMS
1124
400
300
200
100
0
0
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Number of SCT Hits in event
SCT Barrel Occupancy
Occupancies are calculated as N hits / N readout channels, averaged over
10,000 events and over phi.
Number of hits
•
Occupancy =
1.4
Channel Occupancy in %
Occupancies are calculated as N hits / N readout channels, averaged over
10,000 events and over phi.
•
Channel Occupancy in %
Number of readout channels
Layer 0
Layer 1
Layer 2
Layer 3
1.2
1
0.8
1.4
1.2
1
0.8
0.6
0.6
0.4
0.4
−1000
−500
0
500
1000
z [mm]
Layer 0
Layer 1
Layer 2
Layer 3
−60
−40
−20
0
20
40
60
etaModuleID
SCT Disk Occupancy
•
Occupancies are calculated as N hits / N readout channels, averaged over
10,000 events and over phi.
Number of hits
Occupancy =
Occupancy vs r. Each point is referenced by etaModuleID in xAOD. Left/
Right denotes the two end caps.
2
Channel Occupancy in %
Channel Occupancy in %
•
Number of readout channels
Disk 0(L)
Disk 1(L)
Disk 2(L)
Disk 3(L)
Disk 4(L)
Disk 5(L)
1.8
1.6
1.4
1.2
1
2
1.6
1.4
1.2
1
0.8
0.8
0.6
0.6
0.4
0.4
400
500
600
700
800
900
r [mm]
Disk 0(R)
Disk 1(R)
Disk 2(R)
Disk 3(R)
Disk 4(R)
Disk 5(R)
1.8
400
500
600
700
800
900
r [mm]
r [mm]
Comparison against LoI Occupancy
•
2D Occupancy Map for SCT Barrel + Disks.
•
On left, each bin is labelled by Layer/Disk + etaModuleID.
•
On right, each bin is for sensor.
1100
1.6
1000
1.4
900
1.2
800
1
700
0.8
600
0.6
0.4
500
0.2
400
−3000 −2000 −1000
0
1000
2000
3000
z [mm]
0
Conclusions
•
Resolved issue with sample being used. Can we get these samples made
centrally? Both for minimum bias (mu = 0) and ttbar (mu = 200).
•
Even if it is just a 5k sample for ttbar (mu = 200).
•
To do : resolve, increase in occupancy with respect to LoI.
•
Will extend average occupancies to pixels also (for all layouts) and then
look at maximum occupancies expected.
OccupancyStudies2 (4).pdf (PDF, 410.97 KB)
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