On The Phenomenology Of Hadronization And Colour Reconnection

The non-perturbative models for hadronization and colour reconnection of general purpose Monte Carlo event generators have been developed by theoretical motivation, but are ultimately phenomenological models with many free parameters. Although this allows for a good description of the measured data, the uncertainties associated with these models cannot be easily and reliably estimated. In addition, these models are very limited in their predictivity and can exhibit unphysical behaviour, especially in correlation observables. In this thesis we will show some of these shortcomings of the event generator Herwig with a particular focus on baryon production and provide an approach motivated by the colour evolution picture to resolve the encountered issues for the hadronization and colour reconnection models. We discuss the phenomenology of the developed models and study observables that are able to discriminate between different parts of the hadronization model. Additionally, we implement a new colour reconnection topology in order to boost the baryon production and support the measured near side suppression of baryon-baryon angular correlations. ... mehrWe show a colour reconnection algorithm to study its phenomenology and finally compute the momentum dependent dynamical transition probabilities calculated from soft gluon evolution. Finally, we urge the experimental community to measure many more correlation observables for different centre of mass energies and different collision systems in order to pin down the hadronization and colour reconnection models more reliably.