This thesis reports the calculation of neutrino production for the T2K experiment; the most precise a priori estimate of neutrino production that has been achieved for any accelerator-based neutrino oscillation experiment to date. The production of intense neutrino beams at accelerator facilities requires exceptional understanding of chains of particle interactions initiated within extended targets. In this thesis, the calculation of neutrino production for T2K has been improved by using measurements of particle production from a T2K replica target, taken by the NA61/SHINE experiment. This enabled the reduction of the neutrino production uncertainty to the level of 5%, which will have a significant impact on neutrino oscillation and interaction measurements by T2K in the coming years. In addition to presenting the revised flux calculation methodology in an accessible format, this thesis also reports a joint T2K measurement of muon neutrino and antineutrino disappearance, and the accompanying electron neutrino and antineutrino appearance, with the updated beam constraint.

Auteur
Tomislav Vladisavljevic is a postdoctoral researcher at the Rutherford Appleton Laboratory, and a visiting researcher at the University of Oxford. Tomislav completed both his undergraduate degree and DPhil at the University of Oxford. He was also the inaugural recepient of the Kavli IPMU Oxford DPhil Fellowship, and spent two years of his doctoral degree working at the Kavli Institute for the Physics and Mathematics of the Universe, in Japan.

Contenu
Brief introduction.- Theory.- The T2K experiment.- The NA61 Experiment.- The T2K Flux Calculation Tuned to Thin Target Data.- The T2K Flux Calculation Tuned To Replica-Target Data.- Bayesian Statistics and The Markov Chain Monte Carlo Technique for Neutrino Oscillation Analyses.- Joint +¯ T2K Oscillation Analysis With the Reactor Constraint and Replica-Tuned Flux Inputs.- Conclusions and Future Prospects.- Appendices.