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  1. Muon Upgrade Simulations Status Alexei Safonov Texas A&M University

  2. Muon Upgrade Goals • Muon upgrades aim to achieve the following: • Sustain triggering at current thresholds up to |h|=2.4 • Increase offline muon identification coverage to |h|=3.5-4 • Maintain existing envelope by preventing or addressing aging effects • Goal of these studies: • Determine what kind of detectors we need and optimize parameters The “baseline” scenario since ECFA

  3. Organization and People • Muon TP editing group • Editor: Jay Hauser • Contact persons: • Consolidation of existing detectors: • DT: Cristina Bedoya DT • CSC: Armando Lanaro • RPC: Gabriella Pugliese • Simulation: Anna Colaleo, Alexei Safonov • New detectors: Archana Sharma, Marcello Abbrescia • Electronics: Paul Aspell • Integration into CMS and infrastructure, costing: TBD • Twiki: • https://twiki.cern.ch/twiki/bin/viewauth/CMS/HLLHCmuonPhase2

  4. Simulation Goals • Goals: • Quantify physics gains for each proposed element and groups of elements • Determine optimal detector parameters • Strategy: • Implement all components • Write initial algorithms and evaluate performance • Optimize parameters • Resolutions required, number of layers etc • Converge on baseline scenarios

  5. Deliverables • Trigger (focus on Level-1): • Trigger efficiency and rates for viable scenarios • For standalone Level-1 muon trigger rate versus momentum and eta • Input for itegration of standalone L1 muon with track trigger • Offline (focus on muon extension to |h|=4): • ME-0 stub reconstruction efficiency and fake rate • Provide “global muons” with ME-0 in CMSSW for physics studies • ME-0 + forward pixel extension track • Iterate over possible detector parameter scenarios using POG-style variable

  6. Software Integration Status • All components are there at the level of geometries in GEANT and digis • Work focusing on algorithm development and integration with other systems, dependent on status of other detectors: • E.g. forward pixel extension needs to be ready to do ME-0 studies

  7. Muon systems in GEANT • Many thanks to Yanna, Sven, Marcello, Cesare and Slava for a lot of hard work on implementing and validating the geometries in CMSSW

  8. Critical Tasks and Manpower: ME-0 • Deliverables: • Global Muons for physics studies • Muon efficiency, resolution and fake rate for a suitably optimized detector • CMSSW Geometry: • Close to being fully integrated • “Digi to global” chain is in progress • Simplified implementation and the overall framework: Northeastern (Nash, Trocino, Barberis) ~ 1.2 FTE, access to experts (M. Maggi, S. Krutelyov) • Some first results available, need to iterate with a realistic forward pixel extension setup • Studies critical for obtaining realistic results: • Track re-fit with muon hits included - NEU • Neutron backgrounds estimation in FLUKA – TAMU-Qatar (A. Castaneda) ~0.2 FTE • Proper segment reconstruction: a small fraction of M. Maggi (Bari) • Short-living background estimation: TBD • Optimization of segmentation and design, e.g. extra absorber between layers

  9. ME-0 Reconstruction Status • Plots use “emulated” stubs, but formats with full implementation version are similar, should be able to switch • Once done, will automatically get punch through backgrounds simulated (in GEANT) • Framework for global track+muonfit is mostly in place • More work on optimization as pixel tracking stabilized • Need to add neutron backgrounds D. Nash D. Troccino

  10. Neutron Induced Backgrounds • Able to make new geometries in FLUKA and started shielding studies • Preliminary estimates look hopeful: 100 kHz/cm2 is the worst ME-0 will see • Improvements with shielding are possible • Some questions about including hits due to to e+e- • Sensitivity measurements are ongoing (shoot electrons into GEM chambers in GEANT) – T. Maerschalk and A. Magnani • The plan is to properly convolute sensitivities and fluxes vs energy • For now use “magic numbers” for photon/neutron sensitivities from RPC A. Castaneda

  11. Neutron Backgrounds in Digitizer • Hits from long living backgrounds added at the digitization step • Updated rates for GE-1/1 and GE-2/1 with updated geometries (long/short) are targeted for SLHC11 • SLHC10 implied a simpler geometry, but this is a small difference • ME-0 hit rates are the highest, planned to be added in SLHC11 • We may need to use custom samples in the interim to properly estimate backgrounds for ME-0 R. Hadjiiska

  12. Critical Tasks and Manpower: GE1/1 & 2/1 • Deliverables: improved trigger performance, full offline reconstruction • Reconstruction in great good shape, no outstanding issues • A strong team in place – INFN-Bari, TAMU and TAMU-Qatar, Ghent, Sofia, Egypt, Saha • Remaining studies (not on critical path): • Custom reconstruction for high pTmuons (C. Calabria, Archie Sharma, A. Colaleo, S. Krutleyov) and seeding with GEMs (R. Radogna with help of experts: S. Krutelyov, D. Trocino) • More critical remaining studies: • Completion of the local trigger algorithm implementation – S. Dildick, S. Krutelyov, A. Tatarinov, T. Huang, A. Safonov • Proper integration of new features into the full muonTrackFinder - J. Lee, K. Choi (Seoul) starting to interface with Muon TF people with help from experts (S. Dildick, S. Krutelyov, A.S.) • Integration with the L1 Track Trigger – S. Krutelyov, A. Schneider (TAMU)

  13. Trigger: Overview • Critical piece for motivation • Redundancy and bending angle improve trigger • Many technical obstacles: • New upgraded L1 TF is not easily available • Focus on making “integrated” stubs to emulate improved redundancy, trick current CSC TF into taking these stubs and evaluate the improvement

  14. Impact of Redundancy on Trigger • Implementation of a detailed algorithm is in progress • Recover CSC stubs using added redundancy of GEMs • Can even improve the high eta part not covered by GEMs • Remove soft stubs (based on bending angle) at lower eta • Urgent, but can’t happen overnight • Work in progress • RE-3/1 and 4/1 are on even more critical path: we can provide examples, but implementation is not trivial • Need people and need time to develop expertise T. Huang, A. Tatarinov, S. Dildick • Very preliminary algorithm is there, need validation and improvements. Next steps: • Replicate onto YE-2/1 • Run through full system with TF (J. Lee)

  15. Critical Tasks and Manpower: RE3/1, 4/1 • Deliverables: • Introduce RE-3/1 and 4/1 into the trigger for improved performance • Evaluate performance and detector parameters (granularity and timing) • Geometry in CMSSW and digis: P. Verwilligen, I. Osborne, M. Maggi, L. Benucci • Tasks: • Evaluation of background fluxes – S. Costantini; followed by integration for digitization (R. Hadjiska) • Proper integration of digis into the full muonTrackFinder – technical implementation has many synergies with GE-1/1 and GE-2/1 • Critical to make a physics case, but there is a lot of work and debugging that needs to happen there • Dedicated performance and detector optimization studies (timing and position resolution) – likely based on dimuon triggers and signals like rare B decays to pairs of muons, background reduction studies using improved timing (G. Grenier, S. Aly, A. Abdelalim, A. Ali) • Less critical items: • Inclusion of recHits into the global reconstruction, fitting etc.

  16. Summary • The work building the case for Muon system upgrades in Technical Proposal is under way • Structure, people, understanding of the deliverables, and a realistic plan to get them delivered is in place • Shortage of qualified manpower is a definite issue, we are taking it into consideration in planning our work • Critical issues: • Full implementation of new components in the trigger • Dependent on other systems, i.e. there is no easy way to use upgraded L1 muon trigger • Falling back onto old trackfinder and implementing local trigger, make better stubs and feed them to the • Once POG-like elements are largely in, need to fully focus on physics-specific studies