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Description
The study of atmospheric neutrinos has revolutionised the field of neutrino physics with the discovery of neutrino oscillations in 1998. The importance of this discovery was recognized with the Nobel Prize in 2015, awarded to Kajita and McDonald. Almost 20 years after this breakthrough, many questions still loom over neutrino oscillations, and the KM3NeT-ORCA experiment is going after one of the most important: What is the the ordering of neutrino masses? As part of a new generation of atmospheric neutrino detectors, ORCA is being built in the Mediterranean Sea and will instrument a 6 Mton volume of seawater with 64000 PMTs. This large mass and dense instrumentation will enable ORCA to collect high statistics atmospheric neutrino data in the 3 - 7 GeV energy range, where resonant neutrino flavour transitions are expected to occur. In this seminar, I will explain how these resonant transitions arise from neutrino interactions with the matter through which they travel inside the earth, and how this phenomenon can be used to infer the ordering of the neutrino masses. I will also comment on how these same effects can be used to search for new physics beyond the Standard Model and may even allow us to directly measure the chemical composition of the earth for the first time.
