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 |  |=2.4  Increase offline muon identification coverage to |  |=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 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 |  |=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+muon fit 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/cm 2 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 p T muons (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 muon TrackFinder - 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  Very preliminary algorithm is there, need validation and improvements. Next steps:  Replicate onto YE-2/1  Run through full system with TF (J. Lee) T. Huang, A. Tatarinov, S. Dildick

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 muon TrackFinder – 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