Master Thesis defense by Asger Gårdsvoll
Titel: Study of Monte-Carlo simulations of 𝒕 𝒕̅ production via 𝒆 +𝒆 − annihilation
Abstract:
The Standard Model of particle physics has been extensively tested experimentally and shown to successfully predict several phenomena. Experiments have not only confirmed the predictions of the Standard Model but have also resulted in the identification of new, previously unknown, particles. This raises the question of whether there are undiscovered physics, which remain to be detected due to technical limitations of current experimental setups. At CERN a new particle collider, the Future Circular Collider (FCC), has been proposed to be built to reach higher energy levels and with improved detectors to overcome some of these limitations.
The FCC will allow for much more precise and detailed measurements of potential effects from new physics. However, the downside of the increased precision is that the measurements are more sensitive to smaller effects of known physics, which could potentially smear or hide new physics. A better understanding of these effects under the conditions provided by the new FCC would improve our understanding of the data and strengthen our possibility of finding deviations and new physics.
In this project, the Pythia8 and Whizard simulation software packages were used to test different theoretical approaches and simulation technical implementations. More specifically, the use of precision measurements of top quarks to gauge the sensitivity to EFT parameters via simulation of t - tbar production in e+ e- collisions was investigated. Differences in implementations of the different simulation parameters were also studied.
Multiple differences in the implementation of simulations in Pythia8 and Whizard were analysed and great difference to the resulting effects were found.