The IceCube neutrino observatory uses a cubic-km of glacial South Pole ice instrumented with over 5000 optical sensors to detect Cherenkov light produced by atmospheric and astrophysical neutrino interactions. A central region of the detector in the deepest ice, known as DeepCore, is more densely instrumented, allowing neutrinos with energies as low as ~5 GeV to be detected. The upcoming IceCube Upgrade will increase the instrumentation density once again and lower the energy threshold even further, as well as offering significantly improved reconstruction and calibration performance.
At these energies, the oscillation of atmospheric muon neutrinos to tau neutrinos can be simultaneously observed in both the disappearance and appearance channels, constraining the poorly measured tau sector of the PMNS matrix. These measurements significantly contribute to global tests of PMNS unitarity and the standard oscillation picture, constraining the presence of additional neutrino states and other BSM physics. This talk will present recent IceCube/DeepCore tau neutrino appearance results and future prospects with the IceCube Upgrade.
|Working Group||WG5 : Neutrinos Beyond PMNS|