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NA62 Physics & TDAQ Study: L0 Trigger Analysis for First 2014 Run

This study outlines the L0 trigger analysis conducted by Bruno Angelucci from INFN & University of Pisa in the field of NA62 Physics & TDAQ at CERN. The research focuses on detectors involved, signal handling, primitive generation, rejection power of vetoes, and crucial subdetector parameters. The software used for the study includes NA62MC, NA62Reconstruction rev301, and rev314. This project aims to check efficiencies and rates by varying parameters systematically while keeping others constant.

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NA62 Physics & TDAQ Study: L0 Trigger Analysis for First 2014 Run

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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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