22 June 2000 D 2000 - NIU Workshop S. Doulas From Detector to Ntuples: Muons Steven Doulas Northeastern University Boston, MA D0 Muon Upgrade Group

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22 June 2000 D 2000 - NIU Workshop S. Doulas

From Detector to Ntuples: Muons

Steven Doulas

Northeastern UniversityBoston, MA

D0 Muon Upgrade Group

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Muon Upgrade Detector

Bottom B/C Scint

Central Trigger Scint (A- )

ForwardTrigger Scint(Pixels)

Forward Tracker (MDTs)

Shielding

PDTs

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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)

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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.

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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.

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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)

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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.

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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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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.

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Detector Coverage

Forward: Efficiency vs. and

Central: Efficiency vs. and

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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

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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

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EXAMINE Data

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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

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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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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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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)

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Summary

Documents

22 June 2000 D 2000 - NIU Workshop S. Doulas From Detector to Ntuples: Muons Steven Doulas Northeastern University Boston, MA D0 Muon Upgrade Group