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Physics Priorities for Trigger Development

Physics Priorities for Trigger Development. Leonard Apanasevich (UIC) Pedrame Bargessa (Rice). Outline. Introduction to the Trigger Development Group Physics priorities during the initial commissioning stage Initial trigger menu planning Start-up Min-Bias Trigger Suite

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Physics Priorities for Trigger Development

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  1. Physics Priorities for Trigger Development Leonard Apanasevich (UIC) Pedrame Bargessa (Rice) Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  2. Outline • Introduction to the Trigger Development Group • Physics priorities during the initial commissioning stage • Initial trigger menu planning • Start-up Min-Bias Trigger Suite • Evolution of the Trigger Menu Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  3. Trigger Development Group (i) Trigger Menu Development Leonard Apanasevich Pedram Bargassa Rates & Prescales Chi-Nahn Ngyuen Menu Compile & Eval. Alessio Ghezzi Simone Gennai Performance Metrics Silvia Lopez PAG Contacts Ideas for new triggers come in from PAG’s, POG’s, DPG’s, trigger community. For each new trigger: Ensure the resultant global menu fits within the constraints of the L1 and HLT systems. If necessary fine tune thresholds and prescales Provide the tools and expertise to incorporate new trigger paths in the menu Evaluate efficiencies and CPU performance for various luminosity and pileup scenarios Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  4. Trigger Development Group (ii) Trigger Menu Development Leonard Apanasevich Pedram Bargassa Rates & Prescales Chi-Nahn Ngyuen Menu Compile & Eval. Alessio Ghezzi Simone Gennai Performance Metrics Silvia Lopez PAG Contacts Immediate priority • Provide trigger menus for luminosity/pileup scenarios envisioned during the initial startup stage of the LHC • Develop infrastructure needed to allow flexible and rapid development of trigger menus while simultaneously keeping an eye on: • Rates, Efficiencies, and CPU performance Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  5. Physics Priorities for Phase A • Calibrate and align the detector; understand the trigger system • Minbias PT and Rapidity Distributions • Jet, J/Ψ, Υ, etc. triggers • Establish MET • Gamma + Jet Calibration • Begin to re-establish the Standard Model • Study Jet Angular Distribution, Dijets • Look at standard candles: W, Z, top Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  6. LHC Startup Stages Mike Lamont, 20.06.07: Stage A Summary Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  7. Simulated L1 rates at 1028 • No thresholds other than noise suppression needed at L = 1028-1029 for all triggers: muons, e/, jets, missing ET, HT Plot made using 10 million minbias events - no pileup (from S. Dasu) Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  8. Need HLT early on to reduce Level-1 output rate to ~ 200 Hz to tape Suite of min-bias triggers Calorimeter low ET or any muon (no PT cut) Calorimeter low ET Electron ( 5 GeV) or Jet ( 10 GeV) Any muon (effectively  3 GeV PT cut) Other candidate triggers for later running are active for diagnostic and study purposes Initial Trigger Menu Luminosity Increasing Level-1 Trigger Totally Open @ 12.5 kHz Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  9. MinBias Trigger Suite • Prescaled events in crossings and gaps • Minimum total calorimeter Etmin > Enoise • Single-tower triggers • Low threshold L1 "jet" trigger (~10 GeV Et) • Separate forward jets threshold for HF trigger as well (Etmin(HF)> Enoise) • Low threshold Electron trigger (no isolation requirements) • HF ET rings (calculated in GCT from RCT sums). • Tower over threshold bits in HB/HE/HF • Total ET seen in the detector -- this is part of the regular trigger • Low threshold Jet trigger – also part of the regular trigger • Dedicated scintillators in the forward region (aka OPAL scintillators) -- limited acceptance but used as a check • TOTEM detectors if available Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  10. Evolution of the Trigger Menu Employ simultaneous strategies as luminosity & rates rise: • Keep low threshold triggers by adding conditions and/or prescales • Electrons: add isolation at lower thresholds, H/E • Jets: change prescales/add -bits to preserve thresholds for ’s. • Muons: add quality conditions at lower thresholds • more hits on muon tracks of individual muon trigger systems • require coincidence between RPC and either DT or CSC • add isolation at lower thresholds • Raise thresholds for “unrestricted” triggers • Above lowest possible thresholds do not impose conditions • Calorimeter: no isolation above higher threshold or -bits • Muon: remove coincidence & isolation, relax hit requirement • L1 conditions first validated in HLT, then migrated Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

  11. Conclusions • The Trigger Development Group has been formed and is working on preparing trigger menus for the initial commissioning stage of the LHC • Strategies for trigger development and evolution have be implemented • We request input from all corners of the collaboration • We are looking forward to the challenges that lie ahead in the upcoming months Leonard Apanasevich (UIC) Pedrame Bargassa (Rice)

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