Muon Detector Simulation

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Muon Detector Simulation
Arthur Maciel
ALCPG Workshop, January 7, 2004
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LC Activities at NIU/NICADD

• Muon Simulation Development Status Arthur
  Maciel Muon/PID Session
• Scintillator (Semi-)Digital Hadron Calorimeter
  Progress at NIU/NICADD Jerry Blazey, Thursday,
  Session 6, 405pm
• Test Beam Plans for Scintillator Hadron
  Calorimeter Tail-catcher Vishnu Zutshi
  Thursday, Session 6, 405pm
• G4-based Simulation Status Plans Guilherme
  Lima Session 7 Friday 830am

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Simulation Software Development Status

• Briefly
• LCDG4 event production industry
• -- active, and accepting requests
• MOKKA installed and functional
• -- The LCD/SLAC Jan03 detector
• -- The Tail Catcher Prototype
• BareStandalone GEANT4
• -- A simplest tool for control/debug
• -- Tail catcher studies presented here
• For details, see G.Lima, Session 7 (Friday)

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Our Objective

• Develop a test beam prototype for a detector
  optimized for tail-catching and muon reco.
• Early 2005 should be our goal for having a
• fully instrumented detector
• Immediate Goals
• -- decide on the strip dimensions
• -- note this cannot be done in
• software alone

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NICADD Test Beam Simulator
Project Description

• Test Beam Prototype
• Hadron EM Calorimeters, Tail Catcher
• HCal ECal layering similar to SDJan03
• Polystyrene and Silicon sensitive regions

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Detector Geometry
TC
ECal
HCal
1.5 m
1 m
... 12 layers
2.5 m
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Tail Catcher
Front (Hor)
Side
Front (transparent)
Strip widths under study
Front (Vert)
each layer 10 cm Fe 1cm Polyst
1.5 m
1.5 m
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HCal
Front
Side (Angled)
30 cm
1.25 m
1 m
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All Trajectories and Lit Cells Side View
pi E 20 GeV all traj lit cells
Simulation implemented in standalone G4 and
Mokka
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Strip Width Studies

• geometry and reconstruction only
• does not include light collection

G. Lima J. McCormick V. Zutshi A. Maciel

• Limits are determined by
• minimum -- sx(hits) w.r.to the
• previous layer
• -- cost (of channels)
• maximum -- hit densities
• -- geom. resolution
• (e.g. track matching)
• We looked at multiple scattering sx and hit
• densities using a G4 implementation of the
• Tail Catcher. For calorimetric studies see
• Vishnu Zutshis talk, calorimetry session 6.

geometry only
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Muons in the TC Absorber
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s(X) w.r.t. incident position
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s(X) w.r.t. previous layer
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s(X) w.r.t. previous layer
( 5 GeV ms )
using strips (various widths)
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ZH Events _at_ sqrt(s) 500GeV
Hit Density Studies with b-Jets
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ZH Events _at_ sqrt(s) 500GeV
Muons in b-Jets
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ZH Events _at_ sqrt(s) 500GeV
Charged Hadrons in b-Jets
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ZH Events _at_ sqrt(s) 500GeV
Neutral Hadrons in b-Jets
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Fake b-Jets

• Need to judge the hit occupancy near the muon
  track. Example b-Jet
• B ? B p(35GeV)
• ? D m(15GeV)
• ? p(20GeV)K(15GeV)p(10GeV)
• Particles are produced in 0.05 and in 0.1 cone
  individually and hits are combined in the
  analysis program.

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Fake Jet Angular Width (dR 0.05)
1st layer of Em Calorim.
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Fake Jet Angular Width (dR 0.1)
1st layer of Em Calorim.
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Fake Jet Angular Width (dR 0.05)
1st layer of Tail Catcher.
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Fake Jet Angular Width (dR 0.1)
1st layer of Tail Catcher.
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Minimum Dist.(cm) To non-m hit (dR0.05)
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Frequency of non-m hits (dR0.05)
2 l
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Frequency of non-m hits (dR0.1)
2 l
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Frequency of non-m hits (dR0.1)
2 l
using strips (various widths)
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Conclusions

• A first-pass study, also testing the simulation
  software.
• As applied to the NIU test beam Tail Catcher
• Strip widths 4cm lt L lt 6cm
• hit resolution compatible with multiple scatt.
• hit densities such that non-muon occupancy
• (early layers) is below 2

With thanks to G. Lima J. McCormick V. Zutshi