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L0 trigger update

L0 trigger update. Bruno Angelucci INFN & University of Pisa. NA62 Physics & TDAQ WG – CERN 04/06/14. “Feasible for first 2014 run” L0 trigger Detectors involved Signal handling Primitive generation L0 rates and efficiencies Study of crucial subdetectors parameters

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L0 trigger update

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  1. L0 trigger update Bruno Angelucci INFN & University of Pisa NA62 Physics & TDAQ WG – CERN 04/06/14

  2. “Feasible for first 2014 run” L0 trigger • Detectors involved • Signal handling • Primitive generation • L0 rates and efficiencies • Study of crucial subdetectors parameters • Rejecting power of vetoes Outline

  3. Software used • NA62MC and NA62Reconstruction rev301 100k πννevents + 100k of 6 K main decays + 4 muon halo components + beam pions no accidentals • NA62MC and NA62Reconstruction rev314 10k πνν events + 10k of 6 K main decays accidentals superimposed to central event at generation level (±150 ns) • L0 trigger Analyzer developed under NA62Analysis FW Introduction

  4. RICH primitive • Multiplicity counting hits in time bins • Low and Highmultiplicity • CHOD primitive • Coincidence in space (correspondent quadrants) • Coincidence in time • Multiplicity grouping coincidences in time bins • Max hit multiplicity • Quad multiplicity • MUV3 primitive • Time coincidence of 2 PMs of same pad • LKr primitive • Combining cells in SuperCells (SC) in same time bin • Combining SCs in clusters: same time bin, adjacent • Thresholds both for cell and SC energy • 2 or more clusters in time • LAV12 primitive • Hits with low and high threshold channels firing • Slewing timing correction • Offset of different layers Detectors

  5. CHOD Primitive multiplicity All πνν decays Signal (πνν passing conditions)

  6. LKrL0 efficiencies

  7. Kinematic requests • 15 <Pπ< 35 (GeV/c) • 105 < Zvtx < 165 (m) • 0 <M2miss < 0.01 || 0.026 <M2miss < 0.068 (GeV2/c4) • Acceptance requests • No pion decay before LKr • Pion in CHOD and MUV3 acceptance • Pion not in LAVs acceptance • Resulting πνν acceptance: order of 10% Signal selection

  8. The goal is to check efficiencies and rates varying one parameter at a time keeping fixed all others • RICH • Time bin • Low multiplicity threshold • High multiplicity threshold • CHOD • Time bin • “Max” multiplicity threshold • Quadrant multiplicity threshold • LKr • Cell energy threshold • SuperCell energy threshold • Time bin for cell time • Δt for SC and cluster matching • L0TP primitive matching time L0 Parameters

  9. No accidentals

  10. With accidentals

  11. With accidentals

  12. With accidentals

  13. No accidentals

  14. With accidentals

  15. RICH • Time bin = 3.125 ns • Low multiplicity threshold = 4 • High multiplicity threshold = 28 • CHOD • Time bin = 1.5625 ns • “Max” multiplicity threshold = 10 • Quadrant multiplicity threshold = 2 • LKr • Cell energy threshold = 0.1 GeV • SuperCell energy threshold = 0.7 GeV • Time bin for cell time = 12.5 ns • Δt for SC and cluster matching= ±6.25 ns • L0TP primitive matching time = ±(1.5625,3.125) ns L0 Parameters

  16. Rejection power No accidentals With accidentals 0: RICH & CHOD & !MUV3 & !LKr & !LAV • 1: RICH & CHOD & !LKr & !LAV • 2: RICH & CHOD & !MUV3 & !LAV • 3: RICH & CHOD & !MUV3 & !LKr

  17. No accidentals • Efficiency: 91.1±0.3 % • Total rate: 360±11 kHz • With accidentals (halo missing) • Efficiency: 76.7±1.3 % • Total rate: 425±15 kHz Final results

  18. Spares

  19. With accidentals

  20. With accidentals

  21. With accidentals

  22. With accidentals

  23. With accidentals

  24. With accidentals

  25. With accidentals

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