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L0 Trigger Strategy Summary and Run Proposal by Giuseppe Ruggiero at CERN TDAQ WG Meeting

In this summary, Giuseppe Ruggiero presents the L0 trigger strategy at the TDAQ Working Group Meeting held at CERN on April 6, 2014. The discussion explores the acceptance and rejection criteria for L0 triggers, including specific thresholds for muon hits and energy levels. Ruggiero proposes a comprehensive run strategy tailored to enhance detector commissioning and the L0 trigger configuration, emphasizing the need for minimal bias triggers and event reconstructions. The conclusion highlights the necessity for refining the L1 and L2 trigger strategies based on experiences from the 2014 run.

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L0 Trigger Strategy Summary and Run Proposal by Giuseppe Ruggiero at CERN TDAQ WG Meeting

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  1. Trigger Rate Summary Giuseppe Ruggiero (CERN) TDAQ WG Meeting CERN, 04/06/2014 Giuseppe Ruggiero - TDAQ WG meeting

  2. L0 Trigger Summary: pnn (G.R. Note 14/01) • L0 acceptance: • N RICH Hits > 3 • ns • L0 Muon rejection: • GeV (!MIP) • No in-time MUV3 candidate • L0 Energy: • GeV • GeV • GeV Giuseppe Ruggiero - TDAQ WG meeting

  3. L0 Trigger Summary: pnn (cont’d) 18/12/2013 Giuseppe Ruggiero - TDAQ WG meeting Giuseppe Ruggiero - Physics WG meeting

  4. L0 Trigger Summary: Other Rare Decays (E. Goudzovski, Ch. Parkinson Note 14/07) 18/12/2013 Giuseppe Ruggiero - TDAQ WG meeting Giuseppe Ruggiero - Physics WG meeting

  5. Run Strategy (cont’d) • Proposal for a run strategy: • Beam tuning • Low intensity (<1%) kaon run with a minimal L0 trigger configuration • Detector commissioning • L0 trigger commissioning and definition • Sub-detector reconstructions • Muon run • Alignement • Reduced instensity (1-10%) kaon run with a more specific L0 trigger configuration • HLT trigger definition • Event reconstruction • Special runs (?) • low intensity beam in detector acceptance • «proton» run (?) • Reduced  «Full» intensity kaon run with L0 and, possibly, HLT trigger Giuseppe Ruggiero - Physics WG meeting

  6. L0 Trigger Strategy • Minimal configuration (minimum bias triggers): • Q1, Q1 × MUV3, Q1 × !MUV3, Q1 × NHOD, Q1 × NHOD × !MUV3, Q2, QX, ... • pnn main stream: • 2014 run (minimal): • Q1 × (RICH > 3) × !MUV3 × (E LKr < 20) • > 2014 run (full): • Q1 × (RICH > 3) × !MUV3 × (E LKr < 20) × (E LKr + MUV < 40) × (E SAV, LAV < 4) × (E LKr > 1.5 or E MUV > 8.5) Giuseppe Ruggiero - TDAQ WG meeting

  7. L0 Trigger Strategy • Other rare decays (already possible in 2014): • Q1 × (RICH > 3) × (E LKr > 10) / D • QX × (RICH > 10) × (E LKr > 10) / D • QX × (RICH > 10) × (MUV3  2 outer) • QX × (RICH > 10) × (MUV3  1 outer) × (E LKr > 10) • Control samples / Main kaon decay modes: • Minimum bias • Random • Specific for accidental (?) See for reference Note 14/01 & 14/07 Giuseppe Ruggiero - TDAQ WG meeting

  8. HLT Trigger Strategy Track + P + Z requirements applied on events passingpnnfull L0 without accidentals (x5 reduction) • General Minimal: • Nothing • pnn HLT: • At least one track reconstructed (full pattern recognition in straw) • Momentum between 10 and 45 GeV (no fit, only full pattern recognition) • Z vertex < 180 m (no fit, only full pattern recognition, vertex done as intersection with the noinal beam axis) • RICH, CHOD mulitplicity (?) • KTAG (?) • «Rare» decays HLT • HLT for control samples • Sample for accidental studies (KTAG) See for reference G.R. Physics WG 16/10/2013, Pinzino Physics WG 02/04/2014 Giuseppe Ruggiero - TDAQ WG meeting

  9. Tracks N tracks reconstructed in the spectrometer for events passing pnn L0. Very powerful against late Z decays, but may be sensitive to accidental activity. Accidental activity complicates the pattern recognition. Time resolution of good reconstructed tracks expected around 6 ns. Giuseppe Ruggiero - TDAQ WG meeting

  10. Conclusions • The L0 trigger strategy for the physics runs has been outlined. • The expected L0 rate is «well» within the L0 bandwith (enough safety margin). • Besides the trigger comissioning (priority this year!), we must profit from the 2014 to validate/improve the L0 strategy (as much as possible). • Some idea for the L1,2 level trigger are on paper, but the full strategy with all the implementation issues (rate - timing) have not been fully exploited. • The implementation of the L1,2 trigger should closely follow the development of the offline reconstructions (at least for the straws). • In my opinion the 2014 run must be used to define the strategy for the L1,2 triggers and to address all the issues related to the implementation. Giuseppe Ruggiero - TDAQ WG meeting

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