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ILD Muon ID in Mokka CDR Model

ILD Muon ID in Mokka CDR Model. Jacopo and Erik. 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 !

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ILD Muon ID in Mokka CDR Model

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  1. ILD Muon ID in Mokka CDR Model Jacopo and Erik

  2. 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

  3. What was shown yesterday:Results: 5k ILD muons Efficiency Vs theta Average Eff. Per event: 100% Efficiency vs Energy

  4. Results: 5k ILD particle gun muons Replacing the layers so that now we have 9 Efficiency Vs theta Problems in transition region Average Eff. Per event 98% Efficiency vs Energy

  5. Results: 5k ILD particle gun muons Purity Vs theta Replacing the layers so that now we have 9 Average Purity Per event 100% Purity vs Energy

  6. 1 Failed Event screenshot: Pseudolayers ? These 3 hits lie in 3 different yoke-layers. In Pandora they however end up in 2 pseudolayers.

  7. Now increase the nr of stepbacks in the software to 20 Efficiency Vs theta Layers Stepbacks at 20 Average Eff Per event 99% Efficiency vs Energy

  8. Many missed events are mid-IDs Efficiency Vs theta Keep the step-backs at 20 Removing PDG cut Cone cut fixed at 1 Average Eff Per event 100% Efficiency vs Energy

  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.

  10. Spares

  11. Definitions Efficiency: • matched MCParticles/findable MCParticles Purity: • Matched PFOs/findable PFOs • These definitions are per MCParticle see plots and per Event  see numbers

  12. 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

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