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Global Muon Trigger Update

Global Muon Trigger Update. Trigger Meeting, CMS Week, CERN 24 th September, 2002. Hannes Sakulin, HEPHY Vienna. URL of this presentation: http://wwwhephy.oeaw.ac.at/p3w/cms/trigger/globalMuonTrigger/trans/GMT-CMSWeek24Sep2002.pdf. Outline. GMT Hardware Status & Plans

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Global Muon Trigger Update

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  1. Global Muon TriggerUpdate Trigger Meeting, CMS Week, CERN 24th September, 2002 Hannes Sakulin, HEPHY Vienna URL of this presentation: http://wwwhephy.oeaw.ac.at/p3w/cms/trigger/globalMuonTrigger/trans/GMT-CMSWeek24Sep2002.pdf

  2. Outline • GMT Hardware Status & Plans • Simulation Results with 2002 Production • Low and High Luminosity • Single Muon Trigger Rates • Di-Muon Trigger Rates & Contributions • Possible L1 Working Points • Signal Efficiencies • Example of a Topological Di-Muon Trigger for BS m+m- Global Muon Trigger Update

  3. Global Muon Trigger Overview 252 MIP bits252 Quiet bits 4 m RPC barrel 4 m DT Inputs:8 bit f, 6 bit h, 5 bit pT, 2 bits charge, 3 bit quality,1 bit halo/eta fine-coarse Best 4 m 4 m CSC 4 m RPC fwd Output:8 bit f, 6 bit h, 5 bit pT, 1 bit charge, 3 bit quality,1 bit MIP, 1 bit Isolation Global Muon Trigger Update

  4. GMT Status and Plans • Recent progress • Logic design completed • detailed design document & drawings • Functionality improved • added provision for Beam Halo Trigger during normal operation • Documentation • DT/CSC cancel-out unit  improved performance in barrel/endcap overlap regionCMS Note 2002/024: H.Sakulin, “A Robust Solution to the Ghosting Problems of the CMS Level-1 Muon Trigger in the Barrel/Endcap Overlap Region” • Plans for 2002/2003 • continue VHDL simulation of FPGA chips • VHDL simulation of GMT board • Synthesis / design of FPGAs • Milestone Dec. 2001:Logic design done -> Done. • Milestone Dec. 2002:FPGA design done -> Delayed to Dec. 2003 • Milestone Dec. 2003:GMT ready -> Delayed to Jun. 2004 Global Muon Trigger Update

  5. Logic Design: GMT Logic FPGA Global Muon Trigger Update

  6. 2002 Production & Samples • Monte Carlo production (Pythia 6.158) • improved weighting of heavy flavor processes • improved relative normalization of pt10 and pt4 samples • consistent with production in b/t group • CMSIM 125 • ORCA 6.0.2 / 6.1.0 • digitization for LHC Luminosities L = 1034 cm-2s-1 and L = 2x1033 cm-2s-1 • pile-up without muons • ORCA 6.2.2 • Trigger Simulation • Analysis • assume L1 Trigger only up to |h| < 2.1 + Special MIX sample that contains in-time pile-up events with muons - mixed from pt1, pt4 and pt10 - used for high luminosity studies (at low luminosity an analytic correction is used) +additional signal samples Global Muon Trigger Update

  7. Generated rates, Min. Bias, W, Z 2002 Global Muon Trigger Update

  8. Single Muon Trigger Efficiency vs. h |h| < 2.1 eff = 96.9 % h (*)efficiency to find muon of any pT in flat pT sample Global Muon Trigger Update

  9. L1 Single Muon Trigger Rates 50 kHz DAQpTm  14 GeV/c: 2.7 kHz 100 kHz DAQpTm  18 GeV/c: 7.8 kHzpTm  20 GeV/c: 6.2 kHz |h| < 2.1 L = 2x1033cm-2s-1 L = 1034cm-2s-1 Global Muon Trigger Update

  10. L1 Di-Muon Trigger Rate Contributionshigh luminosity (L = 1034cm-2s-1) |h| < 2.1 important contribution from mix sample at low pT low contribution from ghosts low contribution not related to generated muons Global Muon Trigger Update

  11. L1 Single & Di-muon Trigger Rates trigger rates in kHz |h| < 2.1 50 kHz DAQ4 kHz for m, mm 100 kHz DAQ8 kHz for m, mm 18, 8;8eW =84.9 %eZ =99.7 %eBsmm = 7.2 % 20, 5;5eW =82.3 %eZ =99.7 %eBsmm =15.1 % 14, -;-eW =89.6 %eZ =99.8 %eBsmm =27.1 % 25, 4;4eW =74.2 %eZ =99.5 %eBsmm =18.4 % working points compatible with current L1 pT binning L = 2x1033cm-2s-1 L = 1034cm-2s-1 Global Muon Trigger Update

  12. Example of a Topological Trigger • Example channel BS m+m (very rare) • interesting to continue its study at high luminosity • assume L1 working point 20; 5,5 • assume additional 1 kHz for topological trigger generated muonpT spectrum combined efficiencyof single and di-muon trigger starting point 18; 8,8: 7.2 % 20; 5,5: 15.1 % GMT muonpT spectrum working points high luminosity 100 kHz DAQ8 kHz for m, mm 25; 4,4: 18.4 % Global Muon Trigger Update

  13. Topological Di-Muon TriggerDh of highest pT muons generated muons GMT muons Bsmm MBmixWZ Global Muon Trigger Update

  14. Topological Di-Muon TriggerDf of highest pT muons generated muons GMT muons Bsmm MBmixWZ Global Muon Trigger Update

  15. Topological Di-Muon TriggerDf between Muon System and Vertex fvextex – fstation2 negative charge Simple correction for bending: fvextex = fstation2 + 0.55 * charge  Should add conversion of f in GMT Global Muon Trigger Update

  16. Topological Di-Muon TriggerDf of highest pT muons, corrected for bending aftercorrection before correction generated muons GMT muons Bsmm Bsmm MBmixWZ Global Muon Trigger Update

  17. Topological TriggerGain in Rate and Efficiency at working point 20; 5,5 Additional Rate Additional Efficiency topo trigger: |Df| < 2 rad|Dh| < 1.5opposite charge 5,-: + 1kHz 5,-: + 7.8% additional rate 1 kHz, total efficiency = 15.1 % + 7.8 % = 22.9 % Global Muon Trigger Update

  18. Conclusion • GMT design: logic design completed • Updated Simulation Results with 2002 production • single muon trigger rates agree with June CMS Week results • we now also understand di-muon trigger rates very well • Example Study of a Topological Trigger • works well for BS m+m • depending on L1 working point: extra 1 kHz for topological trigger results in large efficiency gain • Propose to add conversion of f at Muon System to f at vertex in the Global Muon Trigger Global Muon Trigger Update

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