global muon trigger update
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Global Muon TriggerUpdate
Hannes Sakulin, HEPHY Vienna
Trigger Meeting, CMS Week, CERN
24th September, 2002
URL of this presentation: http://wwwhephy.oeaw.ac.at/p3w/cms/trigger/globalMuonTrigger/trans/GMT-CMSWeek24Sep2002.pdf
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 2
Trigger Meeting, CMS WeekCERN, 24th September 2002
Outline
GMT Hardware Status & Plans Simulation Results with 2002 Production
Low and High LuminositySingle Muon Trigger RatesDi-Muon Trigger Rates & ContributionsPossible L1 Working PointsSignal Efficiencies
Example of a Topological Di-Muon Trigger for BS
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 3
Trigger Meeting, CMS WeekCERN, 24th September 2002
Global Muon Trigger Overview
•Output:8 bit , 6 bit , 5 bit pT, 1 bit charge, 3 bit quality, 1 bit MIP, 1 bit Isolation
•Inputs:8 bit , 6 bit , 5 bit pT, 2 bits charge, 3 bit quality,1 bit halo/eta fine-coarse
Best 4
4 RPC barrel
4 DT
4 CSC
4 RPC fwd
252 MIP bits252 Quiet bits
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 4
Trigger Meeting, CMS WeekCERN, 24th September 2002
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 2002/2003continue VHDL simulation of FPGA chipsVHDL simulation of GMT boardSynthesis / design of FPGAs
Milestone Dec. 2001: Logic design done -> Done.Milestone Dec. 2002: FPGA design done -> Delayed to Dec. 2003Milestone Dec. 2003: GMT ready -> Delayed to Jun. 2004
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 5
Trigger Meeting, CMS WeekCERN, 24th September 2002
Logic Design: GMT Logic FPGA
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 6
Trigger Meeting, CMS WeekCERN, 24th September 2002
2002 Production & Samples
Monte Carlo production (Pythia 6.158) improved weighting of
heavy flavor processes improved relative normalization
of pt10 and pt4 samplesconsistent with production in b/ 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 || < 2.1
Sample Lint / nb-1 Events in luminosity
MB1mu_pt1 0.0246 150483 MB1mu_pt4 0.9908 255732 MB1mu_pt10 11.4315 86914 W_1mu 3081. 50000 Z/* -> 1mu 2262. 50000
+ 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
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 7
Trigger Meeting, CMS WeekCERN, 24th September 2002
Generated rates, Min. Bias, W, Z
2002
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 8
Trigger Meeting, CMS WeekCERN, 24th September 2002
Single Muon Trigger Efficiency vs.
(*)efficiency to find muon of any pT in flat pT sample
eff = 96.9 %
|| < 2.1
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 9
Trigger Meeting, CMS WeekCERN, 24th September 2002
L1 Single Muon Trigger Rates
|| < 2.1
L = 1034cm-2s-1L = 2x1033cm-2s-1
50 kHz DAQpT
14 GeV/c: 2.7 kHz100 kHz DAQpT
18 GeV/c: 7.8 kHzpT
20 GeV/c: 6.2 kHz
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 10
Trigger Meeting, CMS WeekCERN, 24th September 2002
L1 Di-Muon Trigger Rate Contributionshigh luminosity (L = 1034cm-2s-1)
|| < 2.1
important contribution from mix sample at low pT
low contribution from ghosts
low contribution not related to generated muons
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 11
Trigger Meeting, CMS WeekCERN, 24th September 2002
L1 Single & Di-muon Trigger Rates
|| < 2.1
L = 1034cm-2s-1L = 2x1033cm-2s-1
trigger rates in kHz
working points compatible with current L1 pT binning
20, 5;5W =82.3 %Z =99.7 %Bs=15.1 %
25, 4;4W =74.2 %Z =99.5 %Bs=18.4 %
14, -;-W =89.6 %Z =99.8 %Bs=27.1 %
100 kHz DAQ 8 kHz for
50 kHz DAQ4 kHz for 18, 8;8
W =84.9 %Z =99.7 %Bs= 7.2 %
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 12
Trigger Meeting, CMS WeekCERN, 24th September 2002
Example of a Topological Trigger
Example channel BS (very rare)
interesting to continue its study at high luminosity
assume L1 working point 20; 5,5 assume additional 1 kHz for topological trigger
18; 8,8: 7.2 %
25; 4,4: 18.4 %
generated muonpT spectrum
GMT muonpT spectrum
combined efficiencyof single and di-muon trigger
working points high luminosity
100 kHz DAQ8 kHz for
starting point
20; 5,5: 15.1 %
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 13
Trigger Meeting, CMS WeekCERN, 24th September 2002
Topological Di-Muon Trigger of highest pT muons
MBmixWZBs
GM
T m
uo
ns
ge
ne
rate
d
mu
on
s
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 14
Trigger Meeting, CMS WeekCERN, 24th September 2002
Topological Di-Muon Trigger of highest pT muons
MBmixWZBs
GM
T m
uo
ns
ge
ne
rate
d
mu
on
s
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 15
Trigger Meeting, CMS WeekCERN, 24th September 2002
Topological Di-Muon Trigger between Muon System and Vertex
vextex – station2
negative charge
Simple correction for bending:
vextex = station2 + 0.55 * charge
Should add conversion of in GMT
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 16
Trigger Meeting, CMS WeekCERN, 24th September 2002
Topological Di-Muon Trigger of highest pT muons, corrected for bending
MBmixWZBs
GM
T m
uo
ns
ge
ne
rate
d
mu
on
s
Bs
before correction
aftercorrection
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 17
Trigger Meeting, CMS WeekCERN, 24th September 2002
Topological TriggerGain in Rate and Efficiency at working point 20; 5,5
Additional Rate Additional Efficiency
5,-: + 1kHz
additional rate 1 kHz, total efficiency = 15.1 % + 7.8 % = 22.9 %
5,-: + 7.8%
topo trigger:
|| < 2 rad|| < 1.5opposite charge
Hannes SakulinHEPHY Vienna Global Muon Trigger Update 18
Trigger Meeting, CMS WeekCERN, 24th September 2002
Conclusion
GMT design: logic design completed Updated Simulation Results with 2002 production
single muon trigger rates agree with June CMS Week resultswe now also understand di-muon trigger rates very well
Example Study of a Topological Triggerworks well for BS
depending on L1 working point: extra 1 kHz for topological trigger results in large efficiency gain
Propose to add conversion of at Muon System to at vertex in the Global Muon Trigger
top related