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