Investigation of dipion final state interactions in pp ppeta (eta pi + pi - gamma) with the WASA-at-COSY facility / vorgelegt von Daniel Lersch. 2014
Inhalt
- Abstract and Motivation
- The decay +-
- The Standard Model
- The QCD Lagrangian
- The -meson
- The anomalous sector of QCD
- Experimental observables and recent measurements
- Aim of this work
- The WASA-at-COSY Experiment
- The COSY accelerator
- The pellet target
- Wide Angle Shower Apparatus (WASA)
- The Forward Detector (FD)
- The Central Detector (CD)
- The Mini Drift Chamber (MDC)
- The Plastic Scintillator Barrel (PSB)
- The Scintillator Electromagnetic Calorimeter (SEC)
- Calibration of the SEC
- Track assignment and particle identification
- Data acquisition and trigger
- Analysis Tools and the pp Data Set
- RootSorter
- The Pluto event generator
- The WASA Monte Carlo (WMC) simulation package
- The data set
- Matching simulations to data
- Analysis
- Basic analysis steps
- Reaction specific analysis steps (1st approach)
- Monitoring spectra
- Identification of charged particles in the Central Detector: An excursion
- Artificial neural networks
- Separating two and three pion final state events
- Identification of neutral particles in the Central Detector
- Discussion of the first analysis approach
- Reaction specific analysis steps (2nd approach): The kinematic fit
- Intermediate conclusion
- Outlook: A possible 3rd analysis approach
- Decay Observables of +-
- The relative branching ratio: (+-)(+-0)
- The E distribution
- The pion-photon opening angle distribution
- Addendum: Choosing the proper model
- Dalitz Plot for +-
- Investigation of systematic effects
- Uncertainties related to the kinematic fit
- Uncertainties related to the split-off rejection
- Luminosity effects
- Determination of the -peak content
- Summary of the investigated systematic effects
- Summary and discussion of the results
- Result for the relative branching ratio (+-)(+-0)
- Result for the -value
- Result for the -value
- Discussion
- Future aspects and plans
- Summary and Outlook
- Preselection statistics
- Adjusting the simulated FRH / SE energy resolution
- Error parameterisation
- Errors of reconstructed proton variables
- Errors of reconstructed pion variables
- Errors of reconstructed photon variables
- Offsets of reconstructed proton variables
- Offsets of reconstructed pion variables
- Offsets of reconstructed photon variables
- Errors of fitted proton variables
- Errors of fitted pion variables
- Errors of fitted photon variables
- Relative reconstruction efficiencies
- Determining the E-distribution
- Determining the pion-photon opening angle distribution
- Fitting a constant function to data points
- Systematic studies for (+-)(+-0), and
- Varying the kinematic fit probability
- Varying the split-off rejection parameter A
- Varying the luminosity range
- Varying the signal peak integration
- List of acronyms
- Bibliography