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Contents
Abstract
Acknowledgements
List of Figures
List of Tables
The Standard Model
The Fundamental Particles
The Fermions
Bosons: The Force-carrying Particles
Spin, Helicity and Polarisation
The Electroweak Theory
The LEP Accelerator and OPAL Detector
The LEP Accelerator
The OPAL Detector
Central Tracking Detector
The OPAL Magnet
The Time-Of-Flight Detector
Electromagnetic Calorimeter (ECAL)
Hadronic Calorimeter (HCAL)
Muon Chambers
Forward Detector (FD)
The Silicon-Tungsten Calorimeter (SW)
The OPAL Trigger
Data Acquisition
Trilinear Gauge Boson Couplings and W-Pair Production.
The TGC Lagrangian
TGCs and W Pair Production at LEP
Polarisation of the W-Pair System
W Boson Decays
Polarisation Properties
The Two-Particle Joint Spin Density Matrix
The Single W Spin Density Matrix
Application to Data Events
Calculating the SDM Elements
Calculating the Polarised Cross-Sections
Considerations for Real Events
Events with Final States
Selection of Data
Background Events
Neutral Current Four-Fermion Production
The Background
The Two-Photon Background
Monte Carlo Generators
Four-Fermion Monte Carlo Generators
WW Monte Carlo Generators
Background Generators
Jet Fragmentation
Monte Carlo Samples Used
Detector Simulation
Data Selection and Reconstruction
Selection of Events
Event Reconstruction
189 GeV Data Sample
Extracting the TGCs
The Fit to the Single W SDM Elements
Overcoming Problems of Detector Effects.
Systematic Checks of the SDM Fit Method
The Fit to the Distribution
Systematic Checks of the Fit Method
The Combined Fit
Fit to Many Subsamples
TGCs from 189 GeV Data
Fit to Single W SDM Elements
Fit to the Normalised Distribution
The Combined Fit
Including Systematics
Method to Measure Polarised Cross-sections
Correcting for Detector Effects
Correction for Background
Measurements of Polarised Cross-sections from Data
Individual W Polarised Cross-Sections
W-Pair Polarised Cross-Sections
Evaluation of Systematic Uncertainties
Uncertainties in Electroweak Modelling
Jet Fragmentation
Jet Reconstruction
Background
Detector Simulation and Lepton Response
Overall Systematic Uncertainty
Conclusions
Tests of CP-Invariance
Measurement of TGCs
Measurement of W Polarisation
Summations to Calculate SDM Elements
Summation to Calculate Single W SDM Elements
Summation to Calculate Two-Particle Joint W SDM Elements
Stability of the fit
Bibliography
About this document ...
Jonathan Couchman 2002-11-04