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27/1/2011 ILD Muon ID Efficiency 1/9 ILD Muon ID in Mokka CDR Model Jacopo and Erik
27/1/2011 ILD Muon ID Efficiency 1/9
ILD Muon ID in Mokka CDR Model
Jacopo and Erik
27/1/2011 ILD Muon ID Efficiency 2/9
Various• For details on the algorithm see previous talk• Results shown yesterday at WG6 meeting (see my
talk here) are unfortunately wrong !• Default Marlin steering file had 18 muon layers
instead of 9 !• This is partially the result of the too much “cut and
pasting” which was done in order to produce too quickly a Marlin steering file for the CDR model
• So there was a bug and we have new results now.• Results are produced with muon particle gun, in all
theta and phi angles and energies up to 300 GeV
27/1/2011 ILD Muon ID Efficiency 3/9
What was shown yesterday:Results: 5k ILD muons
Average Eff. Per event: 100%100%
Efficiency Vs thetaEfficiency Vs theta
Efficiency vs EnergyEfficiency vs Energy
27/1/2011 ILD Muon ID Efficiency 4/9
Results: 5k ILD particle gun muons
Average Eff. Per event 98%98%
Efficiency Vs thetaEfficiency Vs theta
Efficiency vs EnergyEfficiency vs Energy
Replacing the layers so that now we have 9
Problems in transition region
27/1/2011 ILD Muon ID Efficiency 5/9
Results: 5k ILD particle gun muons
Average Purity Per event 100%100%
Purity Vs thetaPurity Vs theta
Purity vs EnergyPurity vs Energy
Replacing the layers so that now we have 9
27/1/2011 ILD Muon ID Efficiency 6/9
1 Failed Event screenshot: Pseudolayers ?
These 3 hits lie in 3 different yoke-layers. In Pandora they however end up in 2 pseudolayers.
27/1/2011 ILD Muon ID Efficiency 7/9
Now increase the nr of stepbacks in the software to 20
Average Eff Per event 99%99%
• Layers Stepbacks at 20
Efficiency Vs thetaEfficiency Vs theta
Efficiency vs EnergyEfficiency vs Energy
27/1/2011 ILD Muon ID Efficiency 8/9
Many missed events are mid-IDs
Average Eff Per event 100%100%
Efficiency Vs thetaEfficiency Vs theta
Efficiency vs EnergyEfficiency vs Energy
• Keep the step-backs at 20• Removing PDG cut• Cone cut fixed at 1
27/1/2011 ILD Muon ID Efficiency 9/9
Conclusions• There was a problem in the results shown in the WG6
meeting yesterday• Due to too much cut and pasting in producing the steering
files• We should have 9 layers and not 18• Efficiency drops in transition region• Having 20 step-backs in software in Pandora the efficiency
can be recovered• This is not a solution, problems lies in clustering, we cannot
keep this parameter by default at 20. • All side effects need to be checked• Most of the inefficiency is due to MIS-IDs • Will report about this in WG6 meeting and discuss with
Mark/John/etc.
27/1/2011 ILD Muon ID Efficiency 10/9
Spares
27/1/2011 ILD Muon ID Efficiency 11/9
Definitions
Efficiency: matched MCParticles/findable MCParticles
Purity: Matched PFOs/findable PFOs
These definitions are per MCParticle see plots and per Event see numbers
27/1/2011 ILD Muon ID Efficiency 12/9
Example:Efficiency per Event and per MCParticle
Take 3 events:Event 1 you match 2/2 MCParticles Event 2 you match 1/1 MCParticles Event 3 you match 1/2 MCParticles Efficiency per MCParticle : 4/5 = 0.8 Efficiency per Event : (1+1+0.5)/3 = 0.833
