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Muon chamber efficiencies and muon identification

Muon chamber efficiencies and muon identification. Andrea Venturi INFN Pisa thanks to Tommaso Boccali. Introduction. In ALEPH muon identification relies on the tracking capability of HCAL and Muon chambers HCAL : at least 40-50% of fired hits (out of ~23)

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Muon chamber efficiencies and muon identification

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  1. Muon chamber efficienciesand muon identification Andrea Venturi INFN Pisa thanks to Tommaso Boccali Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  2. Introduction • In ALEPH muon identification relies on the tracking capability of HCAL and Muon chambers • HCAL: at least 40-50% of fired hits (out of ~23) • Muon-ch: at least one hit (out of 4) • HF/LEP1 muon id: HCAL and Muon-ch • LEP2 muon id: HCAL or Muon-ch Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  3. Simulation • Simulation of the digital readout is strongly correlated with the simulation of the muon identification • Digital readout efficiency  muon id efficiency • Digital readout was relatively fragile and almost impossible repairing it during data taking • Digital readout efficiency was not always stable and as high as possible. • How is the simulation done: • single HCAL/muon-ch layer efficiency measured with di-muons events (lack of statistics at LEP2) and hits are randomly deleted in MC events to reproduce the measured efficiencies • done on a year by year basis • NO correlation among planes is taken into account • inefficiencies are distributed uniformly in the whole HCAL/muon-ch plane Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  4. Where we are now • Tommaso released the new muon chamber efficiency banks (MCPE) for 1997-2000 • They replace almost dummy banks used so far: • 1994 efficiencies + ad hoc corrections for known damaged chambers • Measured with di-muon events  mainly Z calibration run • are they representative of the mean muon-ch efficiencies ? • Check done: • Muon-chamber efficiencies measured with 2 photon events • better distributed in time • low momentum • mainly in the endcaps • Muon-chambers occupancy maps • We decided that efficiencies measured with di-muons events are good enough. • HCAL final efficiencies: to be done !! Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  5. What I’m going to talk about Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  6. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  7. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  8. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  9. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  10. A test • Sensitivity of the muon identification efficiency on the muon chamber efficiencies • I have used different muon chamber efficiency banks to analyze the same sample of di-muon MC events at Z peak (300k) • Used efficiency banks • 1994 • 2000 old (dummy) version • 2000 new (Tommaso) version • all layers of all chambers 90% efficient • all layers of all chambers 60% efficient • Useful to: • give us a reference on the requested accuracy to build the efficiency banks • give us an indication on how likely is the possibility that the observed data vs MC discrepancy are due to innacurate muon chamber efficiency mapping • BE CAREFUL: this test does NOT say anything about the intrinsic approximation of the efficiency simulation algorithm • no corralations, spread inefficiencies... Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  11. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  12. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  13. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  14. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  15. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  16. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  17. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  18. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  19. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

  20. Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa

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