Master thesis defence by Thomas Halberg

Title: Low Energy Neutrino Reconstruction in IceCube and the IceCube Upgrade

Abstract:  The upcoming Upgrade for the IceCube Neutrino Observatory will deploy seven new strings featuring multi-PMT optical modules enhancing the sensitivity to O(1-100) GeV neutrinos used in atmospheric neutrino oscillation measurements. Precision reconstruction of neutrino energy and direction is essential to maximizing the sensitivity of these oscillation analyses. Here a likelihood-based reconstruction method where neutrino event hypotheses are generated using direct simulation is presented. The direct reconstruction method is independent of symmetries in the detector, with the ability to fully utilize the new instrumentation and realistic ice models in the IceCube Upgrade.