1. Global Muon Trigger Update
Hannes Sakulin, HEPHY Vienna
Trigger Meeting, CMS Week, CERN
24th September, 2002
URL of this presentation:

2. Global Muon Trigger Update
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-
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

3. Global Muon Trigger Overview
252 MIP bits 252 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
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

4. Global Muon Trigger Update
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 region CMS 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
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

5. Logic Design: GMT Logic FPGA
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

6. Global Muon Trigger Update
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 / 6.1.0
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 pt used for high luminosity studies
(at low luminosity an analytic
correction is used)
+additional signal samples
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

7. Generated rates, Min. Bias, W, Z
2002
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

8. Single Muon Trigger Efficiency vs. h
(*)efficiency to find muon of any pT in flat pT sample
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

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

10. Global Muon Trigger Update
L1 Di-Muon Trigger Rate Contributions high 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
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

11. L1 Single & Di-muon Trigger Rates
trigger rates in kHz
|h| < 2.1
50 kHz DAQ 4 kHz for m, mm
100 kHz DAQ 8 kHz for m, mm
18, 8;8 eW =84.9 % eZ =99.7 % eBsmm = 7.2 %
20, 5;5 eW =82.3 % eZ =99.7 % eBsmm =15.1 %
14, -;- eW =89.6 % eZ =99.8 % eBsmm =27.1 %
25, 4;4 eW =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
Hannes Sakulin HEPHY Vienna
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 muon pT spectrum
combined efficiency of single and di-muon trigger
starting point
18; 8,8: 7.2 %
20; 5,5: 15.1 %
GMT muon pT spectrum
25; 4,4: 18.4 %
working points high luminosity
100 kHz DAQ 8 kHz for m, mm
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

13. Topological Di-Muon Trigger Dh of highest pT muons
generated muons
GMT muons
Bsmm
MBmixWZ
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

14. Topological Di-Muon Trigger Df of highest pT muons
generated muons
GMT muons
Bsmm
MBmixWZ
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

15. Topological Di-Muon Trigger Df between Muon System and Vertex
fvextex – fstation2
negative charge
Simple correction for bending:
fvextex = fstation * charge
 Should add conversion of f in GMT
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

16. Global Muon Trigger Update
Topological Di-Muon Trigger Df of highest pT muons, corrected for bending
after correction
before correction
generated muons
GMT muons
Bsmm
Bsmm
MBmixWZ
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update

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

18. Global Muon Trigger Update
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
Hannes Sakulin HEPHY Vienna
Global Muon Trigger Update