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Matching Tracks from IDScan and TRTxK. UK e/gamma Meeting, January 2005. Graham Kilvington Royal Holloway, University of London. 1. 20/1/05. Overview. Using the e/gamma analysis framework and 8.0.2 production ntuples of 25 GeV single electron events to study tracking algorithm performance

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20/1/05

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  1. Matching Tracks from IDScan and TRTxK UK e/gamma Meeting, January 2005 Graham Kilvington Royal Holloway, University of London 1 20/1/05

  2. Overview • Using the e/gamma analysis framework and 8.0.2 production ntuples of 25 GeV single electron events to study tracking algorithm performance • Track matching: using combination of information from different algorithms to improve identification • Current status of investigations • Future plans 2 20/1/05

  3. The Track Matching Idea: • Use combination of information from IDScan tracks and TRTxK tracks to identify electrons • In each event, impose a loose cut on each IDScan track (on pT) and a loose set of cuts on each TRTxK track (on pT and LHits) • If event contains an IDScan track and a TRTxK track that pass the cuts, check to see if there is an IDScan track with very similar properties to a TRTxK track using a set of comparison cuts • If event also passes these cuts then we say an electron has been found 3 20/1/05

  4. Comparison Method: • Compare every IDScan track to every TRTxK track • Variables being used in comparison are: ∆pT, ∆Φ, and ∆D0 • ∆pT is the difference between the |pT| of the IDScan Track and the |pT| of the TRTxK track • ∆Φ is the difference between Φ at closest approach to origin of the IDScan track and the TRTxK track • ∆D0 is the difference between the radius of closest approach to origin (in the x-y plane) of the IDScan Track and the TRTxK track 4 20/1/05

  5. Comparison Variable 1: pT • Cuts on the |pT| of the individual tracks are included, which impacts on where the cuts on∆pT are placed 5 20/1/05

  6. Comparison Variable 1: ∆pT • Cuts on the |pT| of the individual tracks are included, which impacts on where the cuts on∆pT are placed 5 20/1/05

  7. Comparison Variable 1: ∆pT 5 20/1/05

  8. Comparison Variable 1: ∆pT 5 GeV cuts on pT of individual tracks 10 GeV cuts on pT 5 20/1/05

  9. Comparison Variable 1: ∆pT 7 GeV cuts on pT of IDScan and TRTxK tracks |∆pT| < 20 GeV 5 20/1/05

  10. Comparison Variables 2: ∆Φ No cuts on pT of IDScan and TRTxK tracks 6 20/1/05

  11. Comparison Variables 2: ∆Φ 7 GeV cuts on pT of IDScan and TRTxK tracks |∆Φ| < 0.4 + including peaks at π 6 20/1/05

  12. Comparison Variables 3: ∆D0 No cuts on pT of IDScan and TRTxK tracks 7 20/1/05

  13. Comparison Variables 3: ∆D0 7 GeV cuts on pT of IDScan and TRTxK tracks |∆D0| < 2 cm, 7 20/1/05

  14. Current data: BEFORE comparison method: IDScan TRTxK IDScan+TRTxK IDScan+TRTxK Efficiencies: (Std) (Std) (Std) (Loose) L2Calo 95.7% 95.7% 95.7% 95.7% L2ID 86.1% 69.4% 64.2% 71.1% L2IDCalo 83.6% 69.4% 63.3% 71.1% • IDScan pT > 8 GeV, • TRTxK pT > 5 GeV, • Track-to-calo matching is ON • IDScan pT > 2 GeV, • TRTxK pT > 2 GeV, • Track-to-calo matching is OFF Standard cuts: Loose cuts: 8

  15. Current data: WITH comparison method: IDScan+TRTxK 63.3% (Std) IDScan+TRTxK +Comparison 55.0% (Std) IDScan+TRTxK 71.1% (Loose) IDScan+TRTxK +Comparison 58.8% (Loose) • Comparison cuts: IDScan pT > 7 GeV, TRTxK pT > 7 GeV, |∆pT| < 20 GeV, |∆D0| < 2 cm,|∆Φ| < 0.4 + including peaks at π 9 20/1/05

  16. Current Investigations 1: pT & Charge • Charge information is given by sign of pT of track • IDScan pT for +ve and –ve tracks: 87% 13% No cuts 11% 89% 7 GeV cuts 10

  17. Current Investigations 1: pT & Charge • TRTxK pT for +ve and –ve tracks: 53% 47% No cuts 73% 27% 7 GeV cuts 10

  18. Current Investigation 1: pT • Track multiplicity in events for both algorithms: IDScan TRTxK 10 No cuts 7 GeV cuts

  19. Current Investigation 2: ∆Φ • Distribution of ∆Φ with no cuts imposed: 11 20/1/05

  20. Current Investigation 2: ∆Φ • Distribution of ∆Φ with pT cuts imposed: 11 20/1/05

  21. Current Investigation 2: ∆Φ • Events in π peaks correspond to tracks in the barrel • Plots of IDScan eta if track contributes to π peaks in ∆Φ : 11

  22. Current Investigation 3: ∆D0 12 20/1/05

  23. Current Investigation 3: ∆D0 • D0 distribution for –ve and +ve IDScan and TRTxK tracks with no cuts: IDScan TRTxK 12

  24. Current Investigation 3: ∆D0 • D0 distribution for –ve and +ve IDScan and TRTxK tracks with pT cuts of 7 GeV: IDScan TRTxK 12

  25. Future plans: • Need background data to finalise study – hopefully this can be arranged in the near future, using a version of the framework that works on the new production ntuples • Look into SiTrack to TRTxK track-matching • Continue investigations into how IDScan and TRTxK track reconstruction could give rise to the unexpected features highlighted in the plots shown on previous slides 13 20/1/05

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