energy flow studies
DESCRIPTION
Energy Flow Studies. Steve Kuhlmann Argonne National Laboratory for Steve Magill, U.S. LC Calorimeter Group. Introduction/Outline. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/1.jpg)
Energy Flow Studies
Steve Kuhlmann
Argonne National Laboratory
for Steve Magill, U.S. LC Calorimeter Group
![Page 2: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/2.jpg)
Introduction/Outline
Detector is the “Small” Detector (Si-W EM Cal, 5 mm X 5mm, R=127 cm, 17%/E) (Fe-Scint HAD Cal, 1 cm X 1cm, R=144cm, 60%/E)
Software is JAS2 and GIZMO simulation
Conversion to Geant4 “soon”
Real Track Pattern Recognition Included
Will Discuss:
Brief Photon Review and Plans
Initial work on the Real Challenge: Neutrons/KLongs
![Page 3: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/3.jpg)
Resolution components of Hadronic Z Decays at s = 91 GeV
Assuming Perfect Identification in this Detector Configuration
•Neutrons+KLong 2.9 GeV
•Photons 1.4 GeV
•Tracks 0.25 GeV
Put together in Tesla TDR in Energy Flow algorithm
![Page 4: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/4.jpg)
Hadronic Z Decay
![Page 5: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/5.jpg)
Simple 3 cut analysis
1. Reject EM Clusters if within Delta-R<0.03 from Track (0.2% loss of real photons)
2. Shower Max Energy > 30 MeV (MIP=8 MeV)
3. Reject EM Cluster if Delta-R< 0.1 AND E/P<0.1
Java code is available at:
www.hep.anl.gov/stk/lc/uta/
Will be put in CVS Server “soon”
![Page 6: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/6.jpg)
Hadronic Z Decays at s = 91 GeV
Total Hadron Level Photon Energy (GeV)
Tot
al P
hoto
n C
andi
date
Ene
rgy
![Page 7: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/7.jpg)
Mean=0.25 GeV, Width=2.8 GeV, Perfect EFLOW Goal is 1.4 GeV.
Hadronic Z Decays at s = 91 GeV
Total Photon Energy - Total Monte Carlo Photons (GeV)
![Page 8: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/8.jpg)
Energy Fragments from a Single 10 GeV -
![Page 9: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/9.jpg)
Current Photon Work
1. Reject EM Clusters if within Delta-R<0.03 from Track (0.2% loss of real photons)
2. Shower Max Energy > 30 MeV (MIPS=8 MeV)
3. Reject EM Cluster if Delta-R< 0.1 AND E/P<0.1
Replace these two cuts with SLAC NNet-based ClusterID package.
(Worked on technical difficulties with Bower after UTA,
not solved)
![Page 10: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/10.jpg)
Neutron/K0L Content of Hadronic Z Decays at s = 91 GeV
![Page 11: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/11.jpg)
Neutron/K0L Energies in Hadronic Z Decays at s = 91 GeV
Neutrons/K0L, Mean E=4.4 GeV
Neutrons/K0L, Mean E=4.35
![Page 12: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/12.jpg)
Study of >2 GeV Neutron/K0L overlapping >2 GeV Tracks
![Page 13: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/13.jpg)
Study of >2 GeV Neutron/K0L overlapping >2 GeV Tracks
![Page 14: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/14.jpg)
Study of >2 GeV Neutron/K0L overlapping >2 GeV Tracks
Angular Separation (radians) Angular Separation (radians)
Separation between Track and Closest N/K0L
Separation between N/K0L and Closest Track
Overflow bin
10% overlap within Sep<0.2
23% overlap within Sep<0.4
48% overlap within Sep<0.2
77% overlap within Sep<0.4
Overflow bin
![Page 15: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/15.jpg)
Overlapping Showers from Other Tracks
41% overlap within Sep<0.2 72% overlap within Sep<0.4
Separation between random >2 GeV Track and Closest >2 GeV Track
Angular Separation (radians)16% overlap within Sep<0.1 59% overlap within Sep<0.3
![Page 16: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/16.jpg)
Single 10 GeV Charged Pions: Basic Shower Widths
Angular Separation (radians)
![Page 17: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/17.jpg)
Single 10 GeV Charged Pions: Means and Widths
Mean Width Width
All Hits 8.3 GeV 19% 60%/sqr(E)
Cone<0.4 8.1 GeV 21% 67%/sqr(E)
Cone<0.3 7.9 GeV 22% 68%/sqr(E)
Cone<0.2 7.5 GeV 22% 70%/sqr(E)
Cone<0.1 6.4 GeV 25% 80%/sqr(E)
Cone<0.075 5.8 GeV 28% 88%/sqr(E)
![Page 18: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/18.jpg)
Single 10 GeV Charged Pions:
EM+HAD Energy (GeV) EM+HAD Energy (GeV)
All Hits Cone<0.2
These plots are with analog hadron cal, very similar with digital
![Page 19: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/19.jpg)
Select Charged Pions isolated from other tracks in Z Decays, look
for Neutron Overlap
Cal Energy/Track P
No overlap from particle list
Overlapping Neutron/K0L
![Page 20: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/20.jpg)
Two approaches being investigated:
1) Put calorimeter and track properties into neural
net.
List of calorimeter variables put into
ClusterID Net:
Tesla TDR approach
2) Careful removal of track depositions from Calorimeter. Used in
European package called “Snark”. Results similar to Tesla TDR, but larger
resolution tails.
![Page 21: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/21.jpg)
Reminder, the Questions we eventually need to Answer
Detector Size and Hadron Calorimeter Resolution?
Digital or Analog Hadron Calorimeter?
Optimized segmentation for physics/costs?
![Page 22: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/22.jpg)
Backup Slides
![Page 23: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/23.jpg)
Question from Jeju and Calor2000: Will Hadronization or Jet Clustering Ruin Resolutions?
No, at least if backgrounds are small
![Page 24: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/24.jpg)
Particle Energies in Hadronic Z Decays at s = 91 GeV
Charged, Mean E=2.85
Photons, Mean E=1.0
Neutrons/K0L, Mean E=4.35
![Page 25: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/25.jpg)
Tracking cannot be assumed to be perfect, forward tracking and “curlers” are issues
Effect of ignoring charged particles below certain thresholds
Tesla TDR, is fine if achieved
![Page 26: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/26.jpg)
Track Reconstruction Efficient Down to Pt=0.5 GeV in Barrel Region
![Page 27: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/27.jpg)
Single 10 GeV -
Delta-R from EM Cluster to Track
EM
Clu
ster
Ene
rgy
(GeV
)
EM Clustering -- Cone 0.04
![Page 28: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/28.jpg)
Reduce charged particle fragments with 3-layer shower max energy > 30 MeV
2 GeV Electron
2 GeV -
ddd
ddd
MeV
Also reduces neutron/K0L
clusters
![Page 29: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/29.jpg)
Single 10 GeV -
Delta-R from EM Cluster to Track
EM
Clu
ster
Ene
rgy
(GeV
) Now With Shower Max Cut, will be improved with more detailed information on lateral/longitudinal profile
![Page 30: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/30.jpg)
Effect of possible Photon threshold on Hadronic Z Decays at s = 91 GeV
Sum of all Hadron Level energy except photons < 0.2 GeV. Won’t apply such a cut (yet).
Photons are soft, Mean E=1.0
![Page 31: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/31.jpg)
Hadronic Z Decays at s = 91 GeV
Simple photon finder: Remove EM Clusters within 0.03 of Track, unless track was MIP in all 30 layers. Then remove if within 0.01.
![Page 32: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/32.jpg)
Hadronic Z Decays at s = 91 GeV
Probability of Overlapping Photon Close to a Track, 0.1% within DR<0.02, 3.3% within DR<0.1, 11% within DR<0.2
![Page 33: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/33.jpg)
Determining Charged Particle Determining Charged Particle DepositionsDepositions
Energy deposited in last EM layer Energy deposited in last EM layer (within 0.6(within 0.600 of track) of track)
• Easy to recognize Easy to recognize MIPMIP
• Easy to determine Easy to determine 11stst layer of pion layer of pion showershower
Interactions
Single 2 GeV - Single 2 GeV Muon
Tail
OverflowsZeros
![Page 34: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/34.jpg)
Determining Charged Particle Determining Charged Particle DepositionsDepositions
Single 2 GeV -
Energy weighted
![Page 35: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/35.jpg)
Effect of Neutrinos in Hadronic Z Decays
![Page 36: Energy Flow Studies](https://reader035.vdocuments.us/reader035/viewer/2022081418/568145d8550346895db2db41/html5/thumbnails/36.jpg)
One more cut motivated by Single 10 GeV -, now
either an Energy Ratio
Delta-R from EM Cluster to Track
EM
Clu
ster
Ene
rgy/
Tra
ck E