An exploratory study for the ω − π transition form factor with WASA-at-COSY / vorgelegt von Farha Anjum Khan. Wuppertal, November 2022
Content
- Abstract
- Theory and Motivation
- The meson
- The Form Factor
- The Electromagnetic Form Factor
- The Electromagnetic Meson Transition Form Factor
- 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
- Experimental Setup
- The COoler SYnchroton (COSY) Facility
- Wide Angle Shower Apparatus (WASA)
- The Pellet Target System
- The Forward Detector (FD)
- Forward Window Counter (FWC)
- Forward Proportional Chamber
- Forward Trigger Hodoscope
- Forward Range Hodoscope
- Other miscellaneous Components
- The Central Detector (CD)
- The Superconducting Solenoid - (SCS)
- The Mini Drift Chamber - (MDC)
- The Plastic Scintillator Barrel - (PSB)
- 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 Track Reconstruction
- Particle Identification Method
- Preselection
- Energy Calibration
- Data and Monte Carlo matching
- Run Information
- Data Analysis and Signal Extraction
- pd3He Final State Reconstruction
- pd3He (0) Final State Reconstruction
- Identification
- 0 Reconstruction
- 0 Final State Selection
- Influence of the 0 Final State Selection on the Decay Kinematics
- pd3He (e+e-0) Final State Reconstruction
- 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
- 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
- Results
- Analysis of the Missing Mass of 3He after e+e-0 Final State Selection: Exclusive
- Conclusions and Outlook
- Appendix
- E-E Distributions of the Monte Carlo Simulations of the Backgrounds
- Cut Optimization
- E-E Cut for 3He Selection
- E-P Cut for the 0 Decay
- Monochromatic Selection Cut for the 0 Decay
- e+e- Identification Cut for the e+e-0 Decay
- E-P Cut for the e+e- 0 Decay
- Production Cross Sections and Branching Fractions of the Signal and Backgrounds
- Kinematics of the 0 Decay and it's Monochromatic Property
- Reconstruction Efficiencies for the 0 Final State
- Resolution of the 3He and
- The Weighting Factor wi of Backgrounds Relative to Signal Decay e+e-0
- Reconstruction Efficiencies for the e+e-0 Final State
- The Purity of e+e-0 Decay at Different Analysis Stages
- Luminosity Dependent Missing Mass Analysis
- Reduced 2 for Different Fit Ranges and Polynomial Orders
- Systematic Effect Due to the Fitting Procedure
- Systematic Effect Due to the 3He Identification Cut
- Systematic Effect Due to the Energy-Momentum Constraint
- Systematic Effect Due to the Monochromatic Selection Criterion
- Bibliography
- List of Figures
- List of Tables
- List of acronyms