Speaker
Description
The next generation of neutrino experiments aims to provide high-precision measurements of the neutrino oscillation parameters, thereby revealing the major unknowns in neutrino physics. Among these goals, validating the three-neutrino flavor paradigm remains one of the most exciting prospects, as it may confirm the current framework or testing new physics scenarios.
KM3NeT/ORCA is a water Cherenkov neutrino detector currently under construction in the Mediterranean Sea. Its primary physics goal is an early measurement of the neutrino mass ordering from the oscillation of atmospheric neutrinos passing through the Earth. Additionally, thanks to its large fiducial mass, KM3NeT/ORCA will have unprecedented statistics to study tau neutrinos. This poster reports the final results obtained from the data collected with several partially instrumented configurations, corresponding to 5-16% of the nominal detector volume and an exposure of 1.5 Mton-years. Studying the tau appearance oscillation channel from atmospheric neutrinos, a description of the event reconstruction, selection, and analysis strategy will be given. Finally, the latest results on the measurement of the normalisation factor, defined as the ratio between the number of observed and expected tau neutrinos, will be discussed.