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DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
From Detector to Ntuples: Muons
Steven Doulas
Northeastern UniversityBoston, MA
D0 Muon Upgrade Group
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Muon Upgrade Detector
Bottom B/C Scint
Central Trigger Scint (A- )
ForwardTrigger Scint(Pixels)
Forward Tracker (MDTs)
Shielding
PDTs
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Muon Detector Status
Forward Shielding
N/S EF plugs installed
North EMC truss shielding complete, needs mounting hardware & pre-install. survey
South EMC truss shielding assembly in progress
Forward Muon Tracking Chambers - Mini-Drift Tubes
A-layer MDT’s octants(8+8) installed on N&S end Iron (EF)
C-layer MDT’s completely assembled, these are the largest (Lab F)
B-layer assembly has begun (Lab F)
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Muon Detector Status
Trigger Counters A-layer assembly started on shielding wall,
shooting to have N&S on EF by early July B&C-layer assembled and tested, in storage
at Lab F.
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Level 1 Triggering
Purpose of Level 1 Muon Trigger (L1MU) is to identify muon candidates to Trigger Framework (TF)
L1MU decision <3.3s after Beam crossing
L1MU tools to reduce L1 trigger rates
Match L1CFT track (PT info) with scintillator hits
Timing window for scintillator hits Forming centroids from wire chamber
hits in different planes and correlations between layers
L1MU triggers are user-defined L1MU(mult,PT,eta,scint,wire,sign)
Mult:0,1,2,3 PT:2, 4, 7, 11 GeV eta: C, N, S, NX, SX, 1.0, 1.5, 2.0 CFT and scintillator: L, T, X Wire and scintillator: L, T, X Sign: S, O, X
Commissioning of pre-production muon trigger cards is in progress.
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Level 2 Algorithms
Level 2 (L2) is used as a rejection tool and pre-processing for Level 3
Total L2 bandwidth ~1kHz to L3 L2 has 3 stage processing:~100 s Muon object finding ID quality assignments
Stage 1 - SLIC Cards Fast calibration - T0 subtracted
scintillator hit time and PDTs have drift distances
3D track segment finding for A and BC layers separately
Stage 2 - Alpha pre-processor Assembles 3D muon tracks Assigns track quality (L/T) Calculates momentum Time stamp(prompt,slow,out-time)
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Level 2 Algorithms
Stage 3 - Global Level 2 Collects muon candidates (from
Alpha) and physics objects from other L2 subsystems.
Objects: Jet,EM,MET,MU,TRK,IP
Muon Selection (Num,PT,-range,quality)
Muon Relations (Global L2 ablilities) Isolation, angular sep., muon inside
jet, CFT track match(PT,,) Muon candidates sent to Global and
Muon Level 3 for unpacking Global can select and correlate
different L2 objects and confront them with L2 trigger menu.
Global L2 is the first instance of complete event accessibility.
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Level 3 Filtering
Level 3 (L3) will access the muon system and other subdetectors (CFT, SMT, Cal,...) to find muon candidates
Total L3 bandwidth ~50Hz to Tape Time budget of 1ms
L3 will: Muon Tracking
Fits all hits w/drift distance Uses best fit, better P and track
counting Muon Scintillator
Good TOF(t1-2ns),correlate A and C times, fit for velocity, separate muons from low cosmics, look at opposite sides
Calorimeter Track like object Isolation independent z-vertex, zvtx
20cm
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22 June 2000 D 2000 - NIU Workshop S. Doulas
Level 3 Filtering
CFT 3D matching, zvtx 1cm
SMT Primary vertex zvtx 0.1-0.2cm, secd
vtx
Trigger decisions are made by Filters, Filters obtain info from tools, ScriptRunner runs Filters.
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Detector Coverage
Forward: Efficiency vs. and
Central: Efficiency vs. and
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Title:/usr1/johns/l1musim/results/forwards_phi.ps (Portrait A 4)Creator:HIGZ Version 1.23/07Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Title:/usr1/johns/l1musim/results/central_phi.ps (Portrait A 4)Creator:HIGZ Version 1.23/07Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Title:/usr1/johns/l1musim/results/central_phi.ps (Portrait A 4)Creator:HIGZ Version 1.23/07Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Detector Overview
Detector Thickness Calorimeter
Varies between 5-9 interaction lengths Emin=1.6 GeV for muon exit
Iron Varies between 7-9 interaction lengths Emin=3.3 GeV for muon exit
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Current Online/DAQ
Detector Readout - East Side Central Muon
2 PDT front-end crates (B&C-layer) 2 SCINT front-end crates (A&C-layer)
Triggering on cosmics Collecting data(L1 trigger,L2,L3-
format) writing to disk Plugged into Trigger Framework
Using PDT wire hit frequency and raw data for commissioning and testing FE electronics
Data format looks okay Need to readout more crates Data is read offline by EXAMINE
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
EXAMINE Data
Run 691 (C and Aphi counters)Title:/prj_root/779/alg_7/hedin/test87/muo_examine/bin/691.ps Creator:Ghostscript ps2epsi from run691.psPreview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Offline Muon ID
Muon ID tools Trigger Info
Momentum at different trigger levels?
Global track fit Probability of missing A,B,C layers Tracking-based isolation Muon reconstruction in Calorimeter Matching scintillator times, track velcity
Current Muon ID Segment reconstruction in/out toroid Fit track in muon system (Saclay alg)
Fit track through calorimeter and toroid taking into account MCS and Energy loss
Match CT and A-layer segment PT>1.5 GeV
Muon Particle results from successful fit no muons <2 hits in A-layer
Muon Particle parms = CT parameters Tracking-based isolation
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Check of Muon System
Performance Detector
Efficiency # of hits in tracks and clusters
Thresholds MDTs,PDTs, and Scintillators
Operation of calibration system Operation of electronics
Trigger Rejection rates
Will see this w/trigger monitor (data) Efficiencies
Compare simulation w/real data
Reconstruction Measures peaks Efficiencies
Compare with known cross sections: W and Z’s, J/, etc...
Muon ID Cuts Define quality cuts
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22 June 2000 D 2000 - NIU Workshop S. Doulas
Offline Reconstruction
Muon Momentum Reconstruction Wamus, Famus: results of single
track studies Central tracking: Using mass
resolution for dimuon resonances (M) = 3.5 GeV at Z, <MB>=1.1 (M) = 2.8 GeV at Z, <MB>=0 (M) = 45 MeV at J/, <MB>=1.1
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22 June 2000 D 2000 - NIU Workshop S. Doulas
Offline Reconstruction
Muon Reconstruction Efficiency Current min. Requirement for Muon
ID (loose muon): A-layer segment matched a w/CT track
Acceptance for A-layer segment ||<2 is 80%
CT acceptance ||<2 is ~88% Reconstruction efficiency per loose
muon is defined as the ratio of the # of reconstructed muons(MC confirmed) to all accepted trajectories
Z-> : 96% J/ -> : 92% Z -> bb : 95% Note: MC muons at PT>1.5 GeV, ||<2
(yellow), reconstructed muons with MC confirmation (green)
DD
22 June 2000 D 2000 - NIU Workshop S. Doulas
Summary