Inhalt

•  
   Abstract
•  
  Theory and Motivation
•  
   The meson
•  
   The Form Factor
•  
   The Electromagnetic Form Factor
•  
   The Electromagnetic Meson Transition Form Factor
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   The - Transition Form Factor via Dalitz Decay
•  
   Existing Experimental Data and VMD Comparison
•  
  Beyond the VMD Model
•  
   Effective Field Theories
•  
   Dispersion Relation Calculations
•  
   Dispersive Framework Based Subenergy Unitarity Approach
•  
   Dispersive Framework Based Unitarity and Analyticity Approach
•  
   Model-Independent Calculations using Canterbury Approximants
•  
   Dispersive Analysis Within the Framework of the Khuri-Treiman Equations
•  
   Light-front holographic radiative transition form factors
•  
   Miscellaneous
•  
   Data with WASA-at-COSY
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  Experimental Setup
•  
   The COoler SYnchroton (COSY) Facility
•  
   Wide Angle Shower Apparatus (WASA)
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   The Pellet Target System
•  
  The Forward Detector (FD)
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   Forward Window Counter (FWC)
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   Forward Proportional Chamber
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   Forward Trigger Hodoscope
•  
   Forward Range Hodoscope
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   Other miscellaneous Components
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  The Central Detector (CD)
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   The Superconducting Solenoid - (SCS)
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   The Mini Drift Chamber - (MDC)
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   The Plastic Scintillator Barrel - (PSB)
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   The Scintillating Electromagnetic Calorimeter - (SEC)
•  
   Overview of the Data Acquisition System
•  
   Trigger System
•  
   Experiment Conditions during Production
•  
  Event Reconstruction, Detector Calibration and Run Information
•  
   Analysis Tools
•  
   The PLUTO Event Generator
•  
   WASA MONTE CARLO
•  
   WASA ROOT SORTER
•  
  The Track Reconstruction
•  
   The Forward Detector
•  
   The Central Detector
•  
   Track Assignment
•  
  Particle Identification Method
•  
   The Forward Detector for 3He Identification
•  
   The Central Detector for e, and Identification
•  
   Preselection
•  
  Energy Calibration
•  
   Scintillating Electromagnetic Calorimeter
•  
   Plastic Scintillators
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   Mini Drift Chamber
•  
   Data and Monte Carlo matching
•  
   Run Information
•  
  Data Analysis and Signal Extraction
•  
  pd3He Final State Reconstruction
•  
   3He Selection
•  
   Inclusive Missing Mass of the 3He after 3He Selection
•  
  pd3He (0) Final State Reconstruction
•  
    Identification
•  
   0 Reconstruction
•  
   0 Final State Selection
•  
   Overall Kinematic Check
•  
   Monochromatic Selection Criterion
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   Influence of the 0 Final State Selection on the Decay Kinematics
•  
   The Co-planarity Angle (||)
•  
   The 2 Invariant Mass
•  
   The Kinetic Energy and the Correlation of 3He Particles
•  
   The Exclusive Missing Mass of the 3He Particles after 0 Final State Selection
•  
  pd3He (e+e-0) Final State Reconstruction
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    Identification
•  
   e+e- Identification
•  
  The e+e-0(0) Final State
•  
   Effects from External Conversion
•  
   0 Candidates Selection
•  
   Overall Kinematic Check
•  
   Influence of the e+e-0 Exclusive Final State Selection on the Decay Kinematics
•  
   Missing Mass of 3He after e+e-0 Exclusive Final State Selection
•  
   Invariant Mass of e+e- after e+e-0 Exclusive Final State Selection
•  
  Results and Discussions
•  
   The Inclusive Missing Mass of 3He: pd3He
•  
  The Exclusive Missing Mass of 3He: pd3He (0)
•  
   Branching Ratio of the 0 Decay
•  
   Luminosity Dependence of the Measured Branching Ratio of the 0 Decay
•  
   Systematical Uncertainties
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   Systematic Uncertainty due to Luminosity
•  
   Systematic Effect due to the Fitting Procedure
•  
   Systematic Effect due to 3He Identification
•  
   Systematic Effect due to |P|-E cut
•  
   Systematic Effect due to “Monochromatic ” Criteria
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   Results
•  
   Analysis of the Missing Mass of 3He after e+e-0 Final State Selection: Exclusive
•  
   Conclusions and Outlook
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   Appendix
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   E-E Distributions of the Monte Carlo Simulations of the Backgrounds
•  
  Cut Optimization
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   E-E Cut for 3He Selection
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   E-P Cut for the 0 Decay
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   Monochromatic Selection Cut for the 0 Decay
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   e+e- Identification Cut for the e+e-0 Decay
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   E-P Cut for the e+e- 0 Decay
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   Production Cross Sections and Branching Fractions of the Signal and Backgrounds
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   Kinematics of the 0 Decay and it's Monochromatic Property
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   Reconstruction Efficiencies for the 0 Final State
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   Resolution of the 3He and
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   The Weighting Factor wi of Backgrounds Relative to Signal Decay e+e-0
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   Reconstruction Efficiencies for the e+e-0 Final State
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   The Purity of e+e-0 Decay at Different Analysis Stages
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   Luminosity Dependent Missing Mass Analysis
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   Reduced 2 for Different Fit Ranges and Polynomial Orders
•  
   Systematic Effect Due to the Fitting Procedure
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  Systematic Effect Due to the 3He Identification Cut
•  
   Missing Mass Spectra for Different Cuts
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  Systematic Effect Due to the Energy-Momentum Constraint
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   Missing Mass Spectra for Different Constraints
•  
  Systematic Effect Due to the Monochromatic Selection Criterion
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   Missing Mass Spectra for Different Criteria
•  
   Bibliography
•  
   List of Figures
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   List of Tables
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   List of acronyms