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Pandora efficiency monitoring: results on photons and leptons
J. Nardulli, P. Speckmayerwith a lot of help from J.J. Blaising and E. van der Kraaij
PS I apologize, but this is going to be a long talk full of plots !
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Outline
• The Pandora Efficiency Monitoring algorithm• Results for photons in ILD• Muon Results with Erik’s new PandoraPFA Muon
reconstruction algorithm, seehttp://ilcagenda.linearcollider.org/getFile.py/access?contribId=301&sessionId=80&resId=0&materialId=slides&confId=4507
• Results for electrons• Attempts to recover efficiency for
electrons/photons via shower-reconstruction
26/10/2010 2
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Outline
• The Pandora Efficiency Monitoring algorithm• Results for photons in ILD• Muon Results with Erik’s new PandoraPFA Muon
reconstruction algorithm
• Results for electrons• Attempts to recover efficiency for
electrons/photons via shower-reconstruction
26/10/2010 3
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Motivation
• Common definition for efficiency and purity• Pandora algorithm: for ILD, SiD and all particle
types
26/10/2010 4
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MC particle efficiency, purity• Set the PDG code• select “findable” MC particles:
– all MC-PFOs with chosen (user) PDG code
• analyze PFOs– found
• PFO/MC matching PDG code• >50% E in CaloHits from MC with
matching PDG code• cut:• (params. can be set by user)
– fake• PFO has right PDG code• but criteria not met
– other• PFO has different PDG code
• remaining MCs:– not found MCs
%20%200 MCPFOMC EEE
MC foundMC not found
fake PFO PFO found
other PFO
findable MCs
26/10/2010 5
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MC particle efficiency, purity• Set the PDG code• select “findable” MC particles:
– all MC-PFOs with chosen (user) PDG code
• analyze PFOs– found
• PFO/MC matching PDG code• >50% E in CaloHits from MC with
matching PDG code• cut:• (params. can be set by user)
– fake• PFO has right PDG code• but criteria not met
– other• PFO has different PDG code
• remaining MCs:– not found MCs
%20%200 MCPFOMC EEE
MC found
two PFOs found (MC particle is split)
efficiency can be > 100%
can be avoided by adjusting energy cut
26/10/2010 6
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Resolution plots for 100 GeV photons
CLIC_ILD
26/10/2010 7
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Definition: efficiency
• efficiency for MC particles– found MCs/findable MCs
• for all MCs (overall number +plots: eff. vs. theta, eff. vs. E)• avg. for all MCs per event (overall number)
• purity PFO based– found PFOs/(found PFOs + fake PFOs)
• for all PFOs (overall number +plots: purity vs. theta, purity vs. E)• avg. for all PFOs per event (overall number)
26/10/2010 8
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Efficiency and purity vs Thetasingle 5 GeV photons
CLIC_ILDAvg. Eff. per event: 98.2%
Every plot here has 10000 events26/10/2010 9
CLIC_ILDAvg. Purity Per event: 95.4%
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Efficiency and purity vs ThetaSingle 100 GeV photons
CLIC_ILD Avg. Eff. per event: 90.4%
26/10/2010 10~10k events
CLIC_ILDAvg. Purity per event: 47.4%
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CaloHit efficiency, purity
• CaloHit efficiency for MCs– truePositive/ (truePositive
+falseNegative)
• CaloHit purity for PFOs– truePositive/
(truePositive+falsePositive)
true positive
true negative
false positivefalse negative
MC: photon
PFO: photon
PFO: neutron
PFO: pion
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CaloHit Efficiency and purity vs. Theta5 GeV single photons
CLIC_ILD
Every plot here has 10000 events26/10/2010 12
CLIC_ILD
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CaloHit Efficiency and purity vs. Theta100 GeV single photons
CLIC_ILD
26/10/2010 13Every plot here has 10000 events
CLIC_ILD
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Pandora settings snippet
<algorithm type = "EfficiencyMonitoring" description = "effmon"><ParticleId>22</ParticleId><EnergyBinning>550 -1.0 500.0</EnergyBinning><CalorimeterResolutionStochasticCut>200.</CalorimeterResolutionStochasticCut><CalorimeterResolutionConstantCut>20.</CalorimeterResolutionConstantCut><MinCaloHitEnergyFraction>50.</MinCaloHitEnergyFraction><MonitoringFileName>effmon.root</MonitoringFileName>
</algorithm>
Algorithm namePDG codeHistogram binning (energy)(exists as well for theta)
Stochastic energy resolution cut (in %)
constant energy resolution cut (in %)cut on min. fraction of E from chosen PDG
ROOT filename
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Outline
• The Pandora Efficiency Monitoring algorithm• Results for photons in ILD• Muon Results with Erik’s new PandoraPFA Muon
reconstruction algorithm, seehttp://ilcagenda.linearcollider.org/getFile.py/access?contribId=301&sessionId=80&resId=0&materialId=slides&confId=4507
• Results for electrons• Attempts to recover efficiency for
electrons/photons via shower-reconstruction
26/10/2010 15
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Efficiency: muons from smuons sample Efficiency vs Energy.
Avg. Eff. per event: 97%Efficiency vs Theta
Every plot here has 3000 events 1626/10/2010
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Purity: muons from smuons sample Purity vs Energy
Avg. Purity per event: 98%Purity vs Theta
Every plot here has 3000 events1726/10/2010
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Muons from Z’bb jets Eff vs Theta
Avg. Purity per event: 93%Purity vs Theta
Every plot here has ~1k events26/10/2010 18
Avg. Efficiency per event: 59%
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Muons from Z’bb jets CaloHit Eff vs Theta
CaloHit Purity vs Theta
Every plot here has ~1k events26/10/2010 19
What does this mean ? We have a lot of false Negative low efficiency
many times a PFO in the CAL which was a muon was aassigned as something else
And a few falsePositive high purity
rarely what is “something else” is assigned to be a muon
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Outline
• The Pandora Efficiency Monitoring algorithm• Results for photons in ILD• Muon Results with Erik’s new PandoraPFA Muon
reconstruction algorithm
• Results for electrons• Attempts to recover efficiency for
electrons/photons via shower-reconstruction
2026/10/2010
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Efficiency: electrons from selectrons sample
Efficiency vs Energy.Avg. Eff. per event: 84.1 %
Efficiency vs Theta
Every plot here has ~1k events 2126/10/2010
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Purity vs EnergyAvg. Purity per event: 85.2%
Purity vs Theta
Every plot here has ~1k events 2226/10/2010
Purity: electrons from selectrons sample
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Electrons from Zuds jets Eff vs Theta
Avg. Purity per event: 77.2%Purity vs Theta
Every plot here has ~1k events26/10/2010 23
Avg. Efficiency per event: 46.2 %
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Outline
• The Pandora Efficiency Monitoring algorithm• Results for photons in ILD and SiD• Muon Results with Erik’s new PandoraPFA Muon
reconstruction algorith
• Results for electrons• Attempts to recover efficiency for
electrons/photons via shower-reconstruction
26/10/2010 24
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Attempts to recover efficiency for electrons and photons
• At high energies the identification efficiency for photons and electrons decreases
• We are working on an algorithm to try to recover the efficiency loss
• The idea is to try to reconstruct the products of the shower
2526/10/2010
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Various possibilities are considered• For electrons
– e- e- γ ; – e- e-e+e-; – e- e-e+e- γ; – e- e-e+e- γ γ
• For photons– γ e-e+ ; – γ γ e-e+ ;– γ γ e-e+ γ
• Shower reconstruction based on position and energy of final state particles No results on this yet
2626/10/2010
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Summary• Efficiency/Purity monitoring algorithm for Pandora available
– eff/purity histograms vs. theta/E created– ROOT TTree with all info created– committed in SVN (HEAD)
• Algorithm has been tested on photons for ILD/SiD see previous results
• And also on electrons and muons from selectrons/smuons samples and from jets
• Work is ongoing in writing an algorithm to reconstruct showers
2726/10/2010
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