Through Iron & Ice: Searching for Sterile Neutrinos at the IceCube Neutrino Observatory
Alejandro Diaz

TL;DR
This paper updates global sterile neutrino fits with recent data, finds significant tension between datasets, explores extended models to reduce tension, and presents expanded IceCube sterile neutrino search results.
Contribution
It provides the first comprehensive update to global sterile neutrino fits incorporating new experimental data and extends IceCube searches with novel analysis techniques.
Findings
3+1 model improves fit over null hypothesis
Significant tension remains between datasets
Expanded models reduce but do not eliminate tension
Abstract
Despite the rapid progression in our understanding of neutrinos over the last half century, much is left unknown about their properties. This leaves neutrinos as the most promising portal for Beyond Standard Model (BSM) physics, and neutrinos have already provided fruitful surprises. A number of neutrino experiments in the last three decades have observed anomalous oscillation signals consistent with a mass-squared splitting of , motivating the existence and search for sterile neutrinos. On the other hand, other experiments have failed to see such a signal. In this thesis, we present two analyses. The first is an update to the sterile neutrino global fits with the inclusion of recent experimental data. We find that the 3+1 model provides a better fit to the global data set compared to the null, with an improvement of with the…
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Neutrino Physics Research · Particle physics theoretical and experimental studies
